CA2546759A1 - Low-foaming granular automatic diswashing detergent comprising metal-containing bleach catalyst - Google Patents
Low-foaming granular automatic diswashing detergent comprising metal-containing bleach catalyst Download PDFInfo
- Publication number
- CA2546759A1 CA2546759A1 CA002546759A CA2546759A CA2546759A1 CA 2546759 A1 CA2546759 A1 CA 2546759A1 CA 002546759 A CA002546759 A CA 002546759A CA 2546759 A CA2546759 A CA 2546759A CA 2546759 A1 CA2546759 A1 CA 2546759A1
- Authority
- CA
- Canada
- Prior art keywords
- cobalt
- automatic dishwashing
- compositions
- bleach
- preferred
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 106
- 239000007844 bleaching agent Substances 0.000 title claims abstract description 91
- 239000003599 detergent Substances 0.000 title claims abstract description 60
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 238000005187 foaming Methods 0.000 title claims description 10
- 239000000203 mixture Substances 0.000 claims abstract description 220
- 238000004851 dishwashing Methods 0.000 claims abstract description 79
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 64
- 239000010941 cobalt Substances 0.000 claims abstract description 64
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 64
- 108010065511 Amylases Proteins 0.000 claims abstract description 63
- 102000013142 Amylases Human genes 0.000 claims abstract description 63
- 235000019418 amylase Nutrition 0.000 claims abstract description 58
- 239000003446 ligand Substances 0.000 claims abstract description 39
- 239000011572 manganese Substances 0.000 claims abstract description 37
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 31
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 29
- 239000010452 phosphate Substances 0.000 claims abstract description 29
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004382 Amylase Substances 0.000 claims abstract description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 24
- 108091005804 Peptidases Proteins 0.000 claims abstract description 21
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 claims abstract description 11
- 230000003647 oxidation Effects 0.000 claims abstract description 8
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 8
- 230000007062 hydrolysis Effects 0.000 claims abstract description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 7
- 102000004190 Enzymes Human genes 0.000 claims description 58
- 108090000790 Enzymes Proteins 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000012190 activator Substances 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 18
- 239000004365 Protease Substances 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- BGRWYDHXPHLNKA-UHFFFAOYSA-N Tetraacetylethylenediamine Chemical group CC(=O)N(C(C)=O)CCN(C(C)=O)C(C)=O BGRWYDHXPHLNKA-UHFFFAOYSA-N 0.000 claims description 11
- 239000002736 nonionic surfactant Substances 0.000 claims description 10
- 229910002651 NO3 Inorganic materials 0.000 claims description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- FAGGUIDTQQXDSJ-UHFFFAOYSA-N 3-benzoylazepan-2-one Chemical compound C=1C=CC=CC=1C(=O)C1CCCCNC1=O FAGGUIDTQQXDSJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- JAWGVVJVYSANRY-UHFFFAOYSA-N cobalt(3+) Chemical compound [Co+3] JAWGVVJVYSANRY-UHFFFAOYSA-N 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000002304 perfume Substances 0.000 claims description 4
- CDWQJRGVYJQAIT-UHFFFAOYSA-N 3-benzoylpiperidin-2-one Chemical compound C=1C=CC=CC=1C(=O)C1CCCNC1=O CDWQJRGVYJQAIT-UHFFFAOYSA-N 0.000 claims description 3
- XSVSPKKXQGNHMD-UHFFFAOYSA-N 5-bromo-3-methyl-1,2-thiazole Chemical compound CC=1C=C(Br)SN=1 XSVSPKKXQGNHMD-UHFFFAOYSA-N 0.000 claims description 3
- FCJSHPDYVMKCHI-UHFFFAOYSA-N phenyl benzoate Chemical compound C=1C=CC=CC=1C(=O)OC1=CC=CC=C1 FCJSHPDYVMKCHI-UHFFFAOYSA-N 0.000 claims description 3
- GGAVUMZUOHJGGM-UHFFFAOYSA-N 2-decanoyloxybenzenesulfonic acid Chemical compound CCCCCCCCCC(=O)OC1=CC=CC=C1S(O)(=O)=O GGAVUMZUOHJGGM-UHFFFAOYSA-N 0.000 claims description 2
- MQWCVVYEJGQDEL-UHFFFAOYSA-N 3-(4-nitrobenzoyl)azepan-2-one Chemical compound C1=CC([N+](=O)[O-])=CC=C1C(=O)C1C(=O)NCCCC1 MQWCVVYEJGQDEL-UHFFFAOYSA-N 0.000 claims description 2
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 claims 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 63
- 229910000069 nitrogen hydride Inorganic materials 0.000 abstract description 30
- 150000001450 anions Chemical class 0.000 abstract description 6
- 229910021529 ammonia Inorganic materials 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 229940088598 enzyme Drugs 0.000 description 56
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 42
- -1 cobalt Chemical class 0.000 description 41
- 239000000463 material Substances 0.000 description 41
- 229940025131 amylases Drugs 0.000 description 36
- 229920000642 polymer Polymers 0.000 description 32
- 235000021317 phosphate Nutrition 0.000 description 28
- 238000004140 cleaning Methods 0.000 description 26
- 150000003839 salts Chemical class 0.000 description 24
- 239000004615 ingredient Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 23
- 239000002270 dispersing agent Substances 0.000 description 22
- 239000004094 surface-active agent Substances 0.000 description 22
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- 238000004061 bleaching Methods 0.000 description 19
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- 150000004760 silicates Chemical class 0.000 description 18
- 239000007787 solid Substances 0.000 description 18
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 17
- 239000000460 chlorine Substances 0.000 description 17
- 229910052801 chlorine Inorganic materials 0.000 description 17
- 239000002245 particle Substances 0.000 description 17
- 229910000323 aluminium silicate Inorganic materials 0.000 description 16
- 241001122767 Theaceae Species 0.000 description 15
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 15
- 239000000047 product Substances 0.000 description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 13
- 239000002253 acid Substances 0.000 description 13
- 239000002689 soil Substances 0.000 description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 229920005646 polycarboxylate Polymers 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 102000004882 Lipase Human genes 0.000 description 11
- 108090001060 Lipase Proteins 0.000 description 11
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- 229910052783 alkali metal Inorganic materials 0.000 description 11
- 150000007942 carboxylates Chemical class 0.000 description 11
- 238000005406 washing Methods 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
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- 108010064470 polyaspartate Proteins 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001444 polymaleic acid Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 230000003389 potentiating effect Effects 0.000 description 1
- 230000000063 preceeding effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003217 pyrazoles Chemical class 0.000 description 1
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical compound C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- HEBKCHPVOIAQTA-ZXFHETKHSA-N ribitol Chemical compound OC[C@H](O)[C@H](O)[C@H](O)CO HEBKCHPVOIAQTA-ZXFHETKHSA-N 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- AJTVWPGZWVJMEA-UHFFFAOYSA-N ruthenium tungsten Chemical compound [Ru].[Ru].[W].[W].[W] AJTVWPGZWVJMEA-UHFFFAOYSA-N 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- CDAISMWEOUEBRE-UHFFFAOYSA-N scyllo-inosotol Natural products OC1C(O)C(O)C(O)C(O)C1O CDAISMWEOUEBRE-UHFFFAOYSA-N 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 229940071207 sesquicarbonate Drugs 0.000 description 1
- 229940077386 sodium benzenesulfonate Drugs 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229940079842 sodium cumenesulfonate Drugs 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000012418 sodium perborate tetrahydrate Substances 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 235000019351 sodium silicates Nutrition 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- QUCDWLYKDRVKMI-UHFFFAOYSA-M sodium;3,4-dimethylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1C QUCDWLYKDRVKMI-UHFFFAOYSA-M 0.000 description 1
- IBDSNZLUHYKHQP-UHFFFAOYSA-N sodium;3-oxidodioxaborirane;tetrahydrate Chemical compound O.O.O.O.[Na+].[O-]B1OO1 IBDSNZLUHYKHQP-UHFFFAOYSA-N 0.000 description 1
- KVCGISUBCHHTDD-UHFFFAOYSA-M sodium;4-methylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1 KVCGISUBCHHTDD-UHFFFAOYSA-M 0.000 description 1
- QEKATQBVVAZOAY-UHFFFAOYSA-M sodium;4-propan-2-ylbenzenesulfonate Chemical compound [Na+].CC(C)C1=CC=C(S([O-])(=O)=O)C=C1 QEKATQBVVAZOAY-UHFFFAOYSA-M 0.000 description 1
- MZSDGDXXBZSFTG-UHFFFAOYSA-M sodium;benzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=CC=C1 MZSDGDXXBZSFTG-UHFFFAOYSA-M 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 229910000898 sterling silver Inorganic materials 0.000 description 1
- 239000010934 sterling silver Substances 0.000 description 1
- 125000003107 substituted aryl group Chemical group 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 150000003445 sucroses Chemical class 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000004685 tetrahydrates Chemical class 0.000 description 1
- MSLRPWGRFCKNIZ-UHFFFAOYSA-J tetrasodium;hydrogen peroxide;dicarbonate Chemical compound [Na+].[Na+].[Na+].[Na+].OO.OO.OO.[O-]C([O-])=O.[O-]C([O-])=O MSLRPWGRFCKNIZ-UHFFFAOYSA-J 0.000 description 1
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- GTZCVFVGUGFEME-UHFFFAOYSA-N trans-aconitic acid Natural products OC(=O)CC(C(O)=O)=CC(O)=O GTZCVFVGUGFEME-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-O triethanolammonium Chemical class OCC[NH+](CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-O 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- POZPMIFKBAEGSS-UHFFFAOYSA-K trisodium;2-hydroxypropane-1,2,3-tricarboxylate;trihydrate Chemical compound O.O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O POZPMIFKBAEGSS-UHFFFAOYSA-K 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
- 239000000811 xylitol Substances 0.000 description 1
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 1
- 235000010447 xylitol Nutrition 0.000 description 1
- 229960002675 xylitol Drugs 0.000 description 1
Landscapes
- Detergent Compositions (AREA)
Abstract
Automatic dishwashing detergent compositions comprising phosphate builder and metal-containing bleach catalysts, preferably catalysis containing manganese and/or selected cobalt/ammonia catalysts. Preferred compositions comprise cobalt bleach catalyst having the formula: [Co(NH3)n(M)m(B)b]T y, wherein cobalt is in the +3 oxidation state; n is 4 or 5(preferably 5); M is one or more ligands coordinate to the cobalt by one site; m is 0,1 or 2(preferably 1); B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b=0, then m+n-6, and when b=1, then m=0 and n=4; and T is one or more appropriately selected counteranions present in a number y, where y is an integer to obtain a charge-balanced salt (preferably y is 1 to 3; most preferably 2 when T is a -1 charged anion); and wherein further said catalyst has a base hydrolysis rate constant of less than 0.21M-1 s1 (25°C). Preferred automatic dishwashing compositions further comprise amylase and/or protease enzymes.
Description
PHOSPHATE BUILT AUTOMATIC DISHWASHING COMPOSITIONS
COMPRISING CATALYSTS
TECHNICAL FIELD
The present invention is in the field of bleach-containing detergent compositions, especially automatic dishwashing detergents comprising bleach.
More specifically, the invention encompasses automatic dishwashing detergents (liquids, pastes, and solids such as tablets and especially granules) comprising phosphate builder and metal-containing bleach catalysts, preferably catalysts containing manganese and/or selected cobaltlammonia catalysts. Preferred methods for washing tableware are included.
BACKGROUND OF THE INVENTION
Automatic dishwashing, particularly in domestic appliances, is an ari very different from fabric laundering. Domestic fabric laundering is normally done in purpose-built machines having a tumbling action. These are very different from spray-action domestic automatic dishwashing appliances. The spray action in the latter tends to cause foam. Foam can easily overflow the low sills of domestic dishwashers and slow down the spray action, which in turn reduces the cleaning action. Thus in the distinct field of domestic machine dishwashing, the use of common foam-producing laundry detergent surfactants is normally restricted.
These aspects are but a brief illustration of the unique formulation constraints in the domestic dishwashing field.
Automatic dishwashing with bleaching chemicals is different from fabric bleaching. In automatic dishwashing, use of bleaching chemicals involves promotion of soil removal from dishes, though soil bleaching may also occur.
Additionally, soil antiredeposition and anti-spotting effects from bleaching chemicals would be desirable. Some bleaching chemicals, (such as a hydrogen peroxide source, alone or together with tetraacetylethylenediamine, TAED) can, in certain circumstances, be helpful for cleaning dishware, but this technology gives far from satisfactory results in a dishwashing context: for example, ability to remove tough tea stains is limited, especially in hard water, and requires rather large amounts of bleach. Other bleach activators developed for laundry use can even give negative effects, such as creating unsightly deposits, when put into an automatic dishwashing product, especially when they have overly low solubility. Other bleach
COMPRISING CATALYSTS
TECHNICAL FIELD
The present invention is in the field of bleach-containing detergent compositions, especially automatic dishwashing detergents comprising bleach.
More specifically, the invention encompasses automatic dishwashing detergents (liquids, pastes, and solids such as tablets and especially granules) comprising phosphate builder and metal-containing bleach catalysts, preferably catalysts containing manganese and/or selected cobaltlammonia catalysts. Preferred methods for washing tableware are included.
BACKGROUND OF THE INVENTION
Automatic dishwashing, particularly in domestic appliances, is an ari very different from fabric laundering. Domestic fabric laundering is normally done in purpose-built machines having a tumbling action. These are very different from spray-action domestic automatic dishwashing appliances. The spray action in the latter tends to cause foam. Foam can easily overflow the low sills of domestic dishwashers and slow down the spray action, which in turn reduces the cleaning action. Thus in the distinct field of domestic machine dishwashing, the use of common foam-producing laundry detergent surfactants is normally restricted.
These aspects are but a brief illustration of the unique formulation constraints in the domestic dishwashing field.
Automatic dishwashing with bleaching chemicals is different from fabric bleaching. In automatic dishwashing, use of bleaching chemicals involves promotion of soil removal from dishes, though soil bleaching may also occur.
Additionally, soil antiredeposition and anti-spotting effects from bleaching chemicals would be desirable. Some bleaching chemicals, (such as a hydrogen peroxide source, alone or together with tetraacetylethylenediamine, TAED) can, in certain circumstances, be helpful for cleaning dishware, but this technology gives far from satisfactory results in a dishwashing context: for example, ability to remove tough tea stains is limited, especially in hard water, and requires rather large amounts of bleach. Other bleach activators developed for laundry use can even give negative effects, such as creating unsightly deposits, when put into an automatic dishwashing product, especially when they have overly low solubility. Other bleach
2 systems can damage items unique to dishwashing, such as silverware, aluminium cookware or certain plastics.
Consumer glasses, dishware and flatware, especially decorative pieces, as washed in domestic automatic dishwashing appliances, are often susceptible to damage and can be expensive to replace. Typically, consumers dislike having to separate finer pieces and would prefer the convenience and simplicity of being able to combine all their tableware and cooking utensils into a single, automatic washing operation. Yet doing this as a matter of routine has not yet been achieved.
On account of the foregoing technical constraints as well as consumer needs IO and demands, automatic dishwashing detergent (ADD) compositions are undergoing continual change and improvement: Moreover environmental factors such as the restriction of phosphate, the desirability of providing ever-better cleaning results with less product, providing less thermal energy, and less water to assist the washing process, have all driven the need for improved ADD compositions.
1 S A recognized need in ADD compositions is to have present one or more ingredients which improve the removal of hot beverage stains (e.g., tea, coffee, cocoa, etc.) from consumer articles. Strong alkalis like sodium hydroxide, bleaches such as hypochlorite, builders such as phosphates and the like can help in varying degrees but all can also be damaging to, or leave a film upon, glasses, dishware or 20 silverware. Accordingly, milder ADD compositions have been developed. These make use of a source of hydrogen peroxide, optionally with a bleach activator such as TAED, as noted. Further, enzymes such as commercial amylolytic enzymes (e.g., TERMAMYL~ available from Novo Nordisk S/A) can be added. The alpha-amylase component provides at least some benefit in the starchy soil removal 25 properties of the ADD. ADD's containing amylases typically can deliver a somewhat more moderate wash pI-i in use and can remove starchy soils while avoiding delivering large weight equivalents of sodium hydroxide on a per-gram-of product basis. It would therefore be highly desirable to secure improved bleach activators specifically designed to be compatible in ADD formulations, especially 30 with enzymes such as amylases. A need likewise exists to secure better amylase action in the presence of bleach activators.
Certain manganese catalyst-containing machine dishwashing compositions are described in U.S. Patent 5,246,612, issued September 21, I993, to Van Dijk et al. The compositions are said to be chlorine bleach-free machine dishwashing
Consumer glasses, dishware and flatware, especially decorative pieces, as washed in domestic automatic dishwashing appliances, are often susceptible to damage and can be expensive to replace. Typically, consumers dislike having to separate finer pieces and would prefer the convenience and simplicity of being able to combine all their tableware and cooking utensils into a single, automatic washing operation. Yet doing this as a matter of routine has not yet been achieved.
On account of the foregoing technical constraints as well as consumer needs IO and demands, automatic dishwashing detergent (ADD) compositions are undergoing continual change and improvement: Moreover environmental factors such as the restriction of phosphate, the desirability of providing ever-better cleaning results with less product, providing less thermal energy, and less water to assist the washing process, have all driven the need for improved ADD compositions.
1 S A recognized need in ADD compositions is to have present one or more ingredients which improve the removal of hot beverage stains (e.g., tea, coffee, cocoa, etc.) from consumer articles. Strong alkalis like sodium hydroxide, bleaches such as hypochlorite, builders such as phosphates and the like can help in varying degrees but all can also be damaging to, or leave a film upon, glasses, dishware or 20 silverware. Accordingly, milder ADD compositions have been developed. These make use of a source of hydrogen peroxide, optionally with a bleach activator such as TAED, as noted. Further, enzymes such as commercial amylolytic enzymes (e.g., TERMAMYL~ available from Novo Nordisk S/A) can be added. The alpha-amylase component provides at least some benefit in the starchy soil removal 25 properties of the ADD. ADD's containing amylases typically can deliver a somewhat more moderate wash pI-i in use and can remove starchy soils while avoiding delivering large weight equivalents of sodium hydroxide on a per-gram-of product basis. It would therefore be highly desirable to secure improved bleach activators specifically designed to be compatible in ADD formulations, especially 30 with enzymes such as amylases. A need likewise exists to secure better amylase action in the presence of bleach activators.
Certain manganese catalyst-containing machine dishwashing compositions are described in U.S. Patent 5,246,612, issued September 21, I993, to Van Dijk et al. The compositions are said to be chlorine bleach-free machine dishwashing
3 compositions comprising amylase and a manganese catalyst (in the +3 or +4 oxidation state), as defined by the structure given therein. Preferred manganese catalyst therein is a dinuclear manganese, macrocyclic ligand-containing molecule said to be MnIV2(u-O)3(1,4,7-trimethyl-1,4,7-triazacyclononane)2(PF6)2. Such catalyst materials which contain these more complicated Iigands typically wilt require several synthesis steps to produce, thereby driving up the cost of the catalysts and making them less likely to be readily available for use. Thus, there continues to be a need for simple, widely available catalysts that are effective in automatic dishwashing compositions and methods.
The simple cobalt catalysts useful herein have been described for use in bleach-containing laundry compositions to wash stained fabrics as taught by U.S.
Patent 4,810,410, to Diakun et at, issued March 7,1989. For example, Table 8 therein provides the stain removal results for a series of stains on fabrics washed with laundry compositions with and without the cobalt catalyst [Co(NH3)SCI]C12.
1 S Tea stain removal from fabrics as reported therein appears marginal at best by comparison to the other stains measured.
The comparative inferiority of the cobalt catalysts herein for laundry applications to remove tea stains is reinforced by the teachings contained in the later feled Ewropean Patent Application, Publication No. 408,131, published January 16, 1991 by Unilever NV. Example IV therein, said to be a comparison of the cobalt-cobalt complexes which are viewed as the invention of that application versus the "[Co(NH3)SCl]C12 of the art" (referring to the earlier publication of the European equivalent of the above-noted Diakun et al patent), reports values for removal of tea stain as follows: Co-Co (26.3); [Co(NH3)SCl]C12 (20.6), which is lower than that observed for a simple Mn+2 catalyst as reported in Example II (having a tea stain removal value of 21.4).
Similar results for manganese catalysts versus cobalt catalysts are reported for laundry uses to remove tea stains from cotton fabrics in U,S. 5,244,594, to Favre et al., issued September 14, 1993. Therein, Example I provides data slowing a Co-Co catalyst according to EP 408,131 is inferior to the manganese catalysts.
Further, Example IV also reports lower stain removal at 20°C for a Co-Co catalyst of EP
408,131 and the [Co(NH3)SCl]Cl2 catalyst of the Diakun patent versus a manganese catalyst.
The simple cobalt catalysts useful herein have been described for use in bleach-containing laundry compositions to wash stained fabrics as taught by U.S.
Patent 4,810,410, to Diakun et at, issued March 7,1989. For example, Table 8 therein provides the stain removal results for a series of stains on fabrics washed with laundry compositions with and without the cobalt catalyst [Co(NH3)SCI]C12.
1 S Tea stain removal from fabrics as reported therein appears marginal at best by comparison to the other stains measured.
The comparative inferiority of the cobalt catalysts herein for laundry applications to remove tea stains is reinforced by the teachings contained in the later feled Ewropean Patent Application, Publication No. 408,131, published January 16, 1991 by Unilever NV. Example IV therein, said to be a comparison of the cobalt-cobalt complexes which are viewed as the invention of that application versus the "[Co(NH3)SCl]C12 of the art" (referring to the earlier publication of the European equivalent of the above-noted Diakun et al patent), reports values for removal of tea stain as follows: Co-Co (26.3); [Co(NH3)SCl]C12 (20.6), which is lower than that observed for a simple Mn+2 catalyst as reported in Example II (having a tea stain removal value of 21.4).
Similar results for manganese catalysts versus cobalt catalysts are reported for laundry uses to remove tea stains from cotton fabrics in U,S. 5,244,594, to Favre et al., issued September 14, 1993. Therein, Example I provides data slowing a Co-Co catalyst according to EP 408,131 is inferior to the manganese catalysts.
Further, Example IV also reports lower stain removal at 20°C for a Co-Co catalyst of EP
408,131 and the [Co(NH3)SCl]Cl2 catalyst of the Diakun patent versus a manganese catalyst.
4 While such inferior results are seen for removal of tea stain from fabrics during ~ laundry processes, when used in automatic dishwashing compositions according to the present invention, these catalysts provide surprisingly effective tea stain removal from dishes. Such effectiveness would not have been expected from the prior art.
It is an object of the instant invention to provide automatic dishwashing compositions, especially compact granular, phosphate-free and chlorine bleach-free types, incorporating an improved selection of cobalt catalyst-containing bleaching ingredients. A further object is to provide fully-formulated ADD compositions with l0 or without amylase enzymes, but especially the former, wherein specific cobalt catalyst-containing bleach systems are combined with additional selected ingredients including conventional amylases or bleach-stable amylases, so as to deliver superior tea cleaning results and at the same time excellent care for consumer tableware and flatware:
BACKGROUND ART
In addition to the hereinbefore-noted U.S. Patent 4,810,410, to Diakun et al, issued March 7,1989; U.S. 5,246,612, to Van Dijk et al., issued September 21, 1993;
U.S. 5,244,594, to Favre et al., issued September 14, 1993; and European Patent Application, Publication No. 408,131, published January 16, 1991 by Unilever NV, see also: U.S. Patent 5,114,611, to Van Kralingen et al, issued May I9, 1992 (transition metal complex of a transition metal, such as cobalt, and a non-maero-cyclic ligand); U.S. Pat. 4,430,243, to Bragg, issued February 7, 1984 (laundry bleaching compositions comprising catalytic heavy metal cations, including cobalt);
German Patent Specification 2,054,019, published October 7, 1971 by Unilever 1Y.V. (cobalt chelant catalyst); and European Patent Application Publication No.
549,271, published June 30, 1993 by Unilever PLC (macrocyclic organic Iigands in cleaning compositions).
SUMMARY OF THE INVENTION
It has now been discovered that automatic dishwashing detergent ("ADD") compositions comprising phosphate builder and metal-containing bleach catalyst (preferably manganese and/or cobalt-containing bleach catalysts) provide superior cleaning and stain removal (e.g., tea stain removal) benef ts, and allow for the use of even lower levels of catalyst in the compositions.
Taken broadly, the present invention encompasses automatic dishwashing detergent compositions comprising:
(a) a catalytically effective amount (preferably at a level of from about 0.0001 % to about 1 % by weight of the composition) of a metal-containing bleach
It is an object of the instant invention to provide automatic dishwashing compositions, especially compact granular, phosphate-free and chlorine bleach-free types, incorporating an improved selection of cobalt catalyst-containing bleaching ingredients. A further object is to provide fully-formulated ADD compositions with l0 or without amylase enzymes, but especially the former, wherein specific cobalt catalyst-containing bleach systems are combined with additional selected ingredients including conventional amylases or bleach-stable amylases, so as to deliver superior tea cleaning results and at the same time excellent care for consumer tableware and flatware:
BACKGROUND ART
In addition to the hereinbefore-noted U.S. Patent 4,810,410, to Diakun et al, issued March 7,1989; U.S. 5,246,612, to Van Dijk et al., issued September 21, 1993;
U.S. 5,244,594, to Favre et al., issued September 14, 1993; and European Patent Application, Publication No. 408,131, published January 16, 1991 by Unilever NV, see also: U.S. Patent 5,114,611, to Van Kralingen et al, issued May I9, 1992 (transition metal complex of a transition metal, such as cobalt, and a non-maero-cyclic ligand); U.S. Pat. 4,430,243, to Bragg, issued February 7, 1984 (laundry bleaching compositions comprising catalytic heavy metal cations, including cobalt);
German Patent Specification 2,054,019, published October 7, 1971 by Unilever 1Y.V. (cobalt chelant catalyst); and European Patent Application Publication No.
549,271, published June 30, 1993 by Unilever PLC (macrocyclic organic Iigands in cleaning compositions).
SUMMARY OF THE INVENTION
It has now been discovered that automatic dishwashing detergent ("ADD") compositions comprising phosphate builder and metal-containing bleach catalyst (preferably manganese and/or cobalt-containing bleach catalysts) provide superior cleaning and stain removal (e.g., tea stain removal) benef ts, and allow for the use of even lower levels of catalyst in the compositions.
Taken broadly, the present invention encompasses automatic dishwashing detergent compositions comprising:
(a) a catalytically effective amount (preferably at a level of from about 0.0001 % to about 1 % by weight of the composition) of a metal-containing bleach
5 catalyst (preferably a cobalt bleach catalyst and/or, a manganese bleach catalyst);
(b) an effective amount of a source of hydrogen peroxide;
(c) from about 10% to about 75% of a phosphate builder; and (d) adjunct materials, preferably automatic dishwashing detergent adjunct materials selected from the group consisting of, enzymes, surfactants, non-phosphate builders, chelating agents, and mixtures thereof.
The preferred compositions herein comprise a cobalt-containing bleach catalyst or a manganese-containing bleach catalyst. Preferred cobalt-containing bleach catalysts have the formula:
[Co(NH3)n(M)m(B)bl TY
wherein cobalt is in the +3 oxidation state; n is 4 or 5 (preferably 5); M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2 (preferably 1 ); B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b=0, then m+n = 6, and when b=1; then m=0 and n=4; and T is one or more counteranions present in a number y, where y is an integer to obtain a charge-balanced salt (preferably y is I to 3; most preferably 2 when T is a -1 charged anion); and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25°C).
Also, in another mode, the compositions of the present invention are those wherein the bleach catalyst is a member selected from the group consisting of manganese bleach catalysts, especially manganese "TACN", as described more fully, hereinafter.
The preferred detergent compositions herein further comprise an amylase enzyme. Whereas conventional amylases such as TERMAMYL~ may be used with excellent results, preferred ADD compositions can use oxidative stability-enhanced amylases. Such an amylase is available from NOVO. In it, oxidative stability is enhanced from substitution using threonine of the methionine residue located in
(b) an effective amount of a source of hydrogen peroxide;
(c) from about 10% to about 75% of a phosphate builder; and (d) adjunct materials, preferably automatic dishwashing detergent adjunct materials selected from the group consisting of, enzymes, surfactants, non-phosphate builders, chelating agents, and mixtures thereof.
The preferred compositions herein comprise a cobalt-containing bleach catalyst or a manganese-containing bleach catalyst. Preferred cobalt-containing bleach catalysts have the formula:
[Co(NH3)n(M)m(B)bl TY
wherein cobalt is in the +3 oxidation state; n is 4 or 5 (preferably 5); M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2 (preferably 1 ); B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b=0, then m+n = 6, and when b=1; then m=0 and n=4; and T is one or more counteranions present in a number y, where y is an integer to obtain a charge-balanced salt (preferably y is I to 3; most preferably 2 when T is a -1 charged anion); and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25°C).
Also, in another mode, the compositions of the present invention are those wherein the bleach catalyst is a member selected from the group consisting of manganese bleach catalysts, especially manganese "TACN", as described more fully, hereinafter.
The preferred detergent compositions herein further comprise an amylase enzyme. Whereas conventional amylases such as TERMAMYL~ may be used with excellent results, preferred ADD compositions can use oxidative stability-enhanced amylases. Such an amylase is available from NOVO. In it, oxidative stability is enhanced from substitution using threonine of the methionine residue located in
6 position 197 of B.LicheniTormis or the homologous position variation of a similar parent amylase.
The instant ADD's have numerous advantages, for example they are economical, compact, less damaging to consumer tableware than might be expected on the basis of their potent bleaching action, they are not reliant on chlorinated compounds, and they may be fotmuiated to avoid the undesirable use of overly high levels of caustic ingredients. In certain preferred embodiments, they are substantially free of boron and/or chlorine bleach.
In the ADD composition embodiments, additional bleach-improving materials can be present. Preferably, these are selected from bleach activator materials, such as tetraacetylethylenediamine ("TAED").
The present invention encompasses granular-form, fully-formulated ADD's, preferably chlorine bleach-free, in which additional ingredients, including other enzymes (especially proteases andlor amylases) ire formulated.
The instant invention also encompasses cleaning methods; snore particularly, a method of washing tableware in a domestic automatic dishwashing appliance, comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising an ADD composition as provided hereinbefore.
As already noted, the invention has advantages, including the excellent:
combination of tea stain removal, good dishcare, and good overall cleaning aided by a greater flexibility to formulate enzymes, especially amylases.
All parts, percentages and ratios used herein are expressed as percent weight unless otherwise specified. All documents cited are, in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
Automatic Dishwashing Compositions:
Automatic dishwashing compositions of the present invention comprises phosphate builder, a source of hydrogen peroxide and a metal-containing bleach catalyst. The source of hydrogen peroxide is any common hydrogen-peroxide releasing salt, such as sodium perborate, sodium percarbonate, and mixtures thereof.
Also useful are sources of available oxygen such as persulfate bleach (e.g., OXONE, manufactured by DuPont). In the preferred embodiments, additional ingredients such as water-soluble silicates (useful to provide alkalinity and assist in controlling corrosion), low-foaming nonionic surfactants (especially useful in automatic
The instant ADD's have numerous advantages, for example they are economical, compact, less damaging to consumer tableware than might be expected on the basis of their potent bleaching action, they are not reliant on chlorinated compounds, and they may be fotmuiated to avoid the undesirable use of overly high levels of caustic ingredients. In certain preferred embodiments, they are substantially free of boron and/or chlorine bleach.
In the ADD composition embodiments, additional bleach-improving materials can be present. Preferably, these are selected from bleach activator materials, such as tetraacetylethylenediamine ("TAED").
The present invention encompasses granular-form, fully-formulated ADD's, preferably chlorine bleach-free, in which additional ingredients, including other enzymes (especially proteases andlor amylases) ire formulated.
The instant invention also encompasses cleaning methods; snore particularly, a method of washing tableware in a domestic automatic dishwashing appliance, comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising an ADD composition as provided hereinbefore.
As already noted, the invention has advantages, including the excellent:
combination of tea stain removal, good dishcare, and good overall cleaning aided by a greater flexibility to formulate enzymes, especially amylases.
All parts, percentages and ratios used herein are expressed as percent weight unless otherwise specified. All documents cited are, in relevant part, incorporated herein by reference.
DETAILED DESCRIPTION OF THE INVENTION
Automatic Dishwashing Compositions:
Automatic dishwashing compositions of the present invention comprises phosphate builder, a source of hydrogen peroxide and a metal-containing bleach catalyst. The source of hydrogen peroxide is any common hydrogen-peroxide releasing salt, such as sodium perborate, sodium percarbonate, and mixtures thereof.
Also useful are sources of available oxygen such as persulfate bleach (e.g., OXONE, manufactured by DuPont). In the preferred embodiments, additional ingredients such as water-soluble silicates (useful to provide alkalinity and assist in controlling corrosion), low-foaming nonionic surfactants (especially useful in automatic
7 dishwashing to control spotting/filming), dispersant polymers (which modify and inhibit crystal growth of calcium andlor magnesium salts), chelants (which control transition metals), builders other than phosphate such as citrate (which help control calcium and/or magnesium and may assist buffering action), alkalis (to adjust pH), and detersive enzymes {to assist with tough~food~cleaning, especially of starchy and proteinaceous soils), are present. Additional bleach-modifying materials such as conventional bleach activators such as TAED may be added, provided that any such bleach-modifying materials are delivered in such a manner as to be compatible with the purposes of the present invention. The present detergent compositions may, moreover, comprise one or more processing aids, fillers, perfumes, conventional enzyme particle-making materials including enzyme cores or "nonpareils", as well as pigments, and the like.
In general, materials used for the production of ADD compositions herein are preferably checked for compatibility with spotting/filming on glassware.
Test 1 S methods for spotting/filming are generally described in the automatic dishwashing detergent literature, including DIN test methods. Certain oily materials, especially at longer chain lengths, and insoluble materials such as clays, as well as long-chain fatty acids or soaps which form soap scum are therefore preferably limited or excluded from the instant compositions.
Amounts of the essential ingredients can vary within wide ranges, however preferred automatic dishwashing detergent compositions herein (which have a 1 aqueous solution pH of from about 7 to about 12, more preferably from about 9 to about 11.5, and most preferably less than about 11, especially from about 9 to about I I ) are those wherein there is present: from about 10% to about 75%, preferably from about I S% to about SO%, of phosphate builder; from about 0.1 % to about 70%, preferably from about 0.5% to about 30%, of a source of hydrogen peroxide;
from about 0.0001 % to about 1 %, preferably from about 0.005% to about 0.1 %, of a metal-containing bleach catalyst (most preferred cobalt catalysts useful herein are present at from about 0.005% to about 0.01%); from about 0.1% to about 40%, preferably from about 0.1% to about 20% of a water-soluble (two ratio) silicate; and from about 0.1 % to about 20% , preferably from about 0.1 % to about 10% of a low-foaming nonionic surfactant. Such fully-formulated embodiments typically further comprise from about 0.1 % to about I S% of a polymeric dispersant, from about 0.01 % to about 10% of a chelant, and from about 0.00001 % to about 10% of a g detersive enzyme though further additional or adjunct ingredients may be present.
Detergent compositions herein in granular form typically limit water content, for example to less than about 7% free water, for best storage stability.
Further, preferred ADD compositions of this invention are substantially free of chlorine bleach. By "substantially free" of chlorine bleach is meant that the formulator does not deliberately add a chlorine-containing bleach additive, such as a chloroisocyanurate, to the preferred ADD composition. However, it is recognized that because of factors outside the control of the formulator, such as chlorination of the water supply, some non-zero amount of chlorine bleach may be present in the wash liquor. The term "substantially free" can be similarly constructed with reference to preferred limitation of other ingredients.
By "effective amount" herein is meant an amount which is sufficient, under whatever comparative test conditions are employed, to enhance cleaning of a soiled surface. Likewise, the term "catalyticaliy effective amount" refers to an amount of metal-containing bleach catalyst which is sufficient under whatever comparative test conditions are employed, to enhance cleaning of the soiled surface. In automatic dishwashing, the soiled surface may be, for example, a porcelain cup with tea stain, dishes soiled with simple starches or more complex food soils, or a plastic spatula stained with tomato soup. The test conditions will vary, depending on the type of washing appliance used and the habits of the user. Some maclvnes have considerably longer wash cycles than others. Some users elect to use warm water without a great deal of heating inside the appliance; others use wanm or even cold water fill, followed by a warm-up through a built-in electrical coil. Of course, the performance of bleaches and enzymes will be affected by such considerations, and the levels used in fully-formulated detergent and cleaning compositions can be appropriately adjusted.
Metal-containingyBleach Catalysts:
The present invention compositions and methods utilize metal-containing bleach catalysts that are effective for use in ADD compositions. Preferred are manganese and cobalt-containing bleach catalysts.
One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal ration of defined bleach catalytic activity, such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese rations, an auxiliary metal ration having little or no bleach catalytic activity, such as zinc or aluminum canons, and a sequestrate having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, ethylenediaminetetra (methylenephosphonic acid) and water-soluble salts thereof.
Such catalysts are disclosed in U.S. Pat. 4,430,243.
S Other types of bleach catalysts include .the manganese-based complexes disclosed in U.S. Pat. 5,246,621 and U.S. Pat. 5,244,594. Preferred examples of theses catalysts include MnIV2(u-O)3(I,4,7-trimethyl-1,4,7-triazacyclononane)~-(PF6)2 ("MnTACN"), MnIII2(u-O)1(u-OAc)2(1,4,7-trimethyl-1,4,7-triazacyclono-nane)2-(C104)2, MnIV4(u-O)6(1,4;7-triazacyclononane)4-(CI04)2, MnIIIMnIV4(u_ O)I(u-OAc)2(1,4,7-trimethyl-1,4,7-triazacyclononaner-(C104)3, and mixtures thereof. See also European patent application publication no. 549,272. Other ligands suitable for use herein include 1,5,9-trimethyl-I,5,9-triazacyclododecarle, 2-methyl-1,4,7-triazacyclononane, 2-methyl-1,4,7-triazacyclononane, and mixtures thereof.
The bleach catalysts useful in automatic dishwashing compositions and concentrated powder detergent compositions may also be selected as appropriate for the present invention. For examples of suitable bleach catalysts see U.S. Pat.
4,246,612 and U.S. Pat. 5,227,084.
See also U.S. Pat. 5,194,416 which teaches mononuclear manganese {IV) complexes such as Mn(1,4,7-trimethyl-1,4;7-triazacyclononane(OCH3)3-(PF6).
Still another type of bleach catalyst, as disclosed in U.S. Pat. 5,114,606, is a water-soluble complex of manganese (II), (III), and/or (IV) with a ligand which is a non-carboxylate polyhydroxy compound having at least three consecutive C-OH
groups. Preferred ligands include sorbitol, iditol, dulsitol, mannitol, xylitol, arabitol, adonitol, meso-erythritol, meso-inositol, lactose, and mixtwes thereof.
U.S. Pat. 5,114,611 leaches a bleach catalyse comprising a complex of transition metals, including Mn, Co, Fe, or Cu, with an non-(macro)-cyclic iigand.
Said ligands are of the formula:
Ri R3 RL--N=C-B-C=N-R°
wherein Rl, R2, R3, and R4 can each be selected from H, substituted alkyl and aryl groups such that each RI-N=C-R2 and R3-C=N-R4 form a five or six-membered ring. Said ring can further be substituted. B is a bridging group selected from O, S.
CRSR6, NR~ and C=O, wherein R5, R6, and R~ can each be H, alkyl, or aryl groups, including substituted or unsubstituted groups. Preferred ligands include pyridine, pyridazine, pyrimidine, pyrazine, imidazole, pyrazole, and triazole rings.
Optionally, said rings may be substituted with substituents such as alkyl, aryl, 5 alkoxy, halide, and nitro. Particularly preferred is the ligand 2;2'-bispyridylamine.
Preferred bleach catalysts include Co, Cu, Mn, Fe,-bispyridylmethane and -bispyridylamine complexes. Highly preferred catalysts include Co(2,2'-bispyridylamine)C12, Di(isothiocyanato)bispyridylamine-cobalt (II), trisdipyridylamine-cobalt(II) perchlorate, Co(2,2-bispyridylamine)202CI04, Bis-10 (2,2'-bispyridylamine) copper(II) perchlorate, tris(di-2-pyridylamine) iron(II) perchlorate, and mixtures thereof.
Other examples include Mn gluconate, Mn(CF3S03)~, Co(NH3)SCI, and_ the binuclear Mn complexed with tetra-N-dentate and bi-N-dentate ligands, including N4MnIII(u_O)~MnIVN4)+and (BipY2MnIII(u_O)2MnIVbipY2~-(C104)3~
1 S The bleach catalysts may also be prepared by combining a water-soluble ligand with a water-soluble manganese salt in aqueous media and concentrating the resulting mixture by evaporation. Any convenient water-soluble salt of manganese can be used herein. Manganese (II), (III), (IV) and/or (V) is readily available on a commercial scale. In some instances, sufficient manganese may be present in the wash liquor, but, in general, it is preferred to detergent composition Mn ca~ions in the compositions to ensure its presence in catalytically-effective amounts.
Thus, the sodium salt of the ligand and a member selected from the group consisting of MnS04, Mn(C104)2 or MnCl2 (least preferred) are dissolved in water at molar ratios of ligand:Mn salt in the range of about I :4 to 4:1 at neutral or slightly alkaline pH. The water may first be de-oxygenated by boiling and cooled by spraying with nitrogen. The resulting solution is evaporated (under N2, if desired) and the resulting solids are used in the bleaching and detergent compositions herein without further purification.
In an alternate mode, the water-soluble manganese source, such as MnS04, is added to the bleach/cleaning composition or to the aqueous bleaching/cleaning bath which comprises the ligand. Some type of complex is apparently formed in situ, and improved bleach performance is secured. In such an in situ process, it is convenient to use a considerable molar excess of the ligand over the manganese, and mole ratios of ligand:Mn typically are 3:1 to 15:1. The additional ligand also serves to scavenge vagrant metal ions such as iron and copper, thereby protecting the bleach from decomposition. Orie possible such system is described in European patent application, publication no. 549,271.
While the structures of the bleach-catalyzing manganese complexes of the present invention have not been elucidated, it may be speculated that they comprise chelates or other hydrated coordination complexes which result from the interaction of the carboxyl and nitrogen atoms of the ligand with the manganese cation.
Likewise, the oxidation state of the manganese cation during the catalytic process is not known with certainty, and may be the (+II), (+III), (+IV) or (+V) valence state.
Due to the ligands' possible six points of attachment to the manganese cation, it may be reasonably speculated that mufti-nuclear species andlor "cage" structures may exist in the aqueous bleaching media. Whatever the form of the active Mwiigand species which actually exists, it functions in an apparently catalytic manner to provide improved bleaching performances on stubborn stains such as tea, ketchup, coffee, wine, juice, and the like.
Other bleach catalysts are described, for example, in European patent application, publication no. 408,131 (cobalt complex catalysts), European patent applications, publication nos. 384,503, and 306,089 (metallo-porphyrin catalysts), U.S. 4,728,455 (manganese/multidentate ligand catalyst), U.S. 4,71I,748 and European patent application, publication no. 224,952, (absorbed manganese on aluminosilicate catalyst), U.S. 4,601,845 (aluminosilicate support with manganese and zinc or magnesium salt), U.S. 4,626,373 (manganese/ligand catalyst), U.S.
4,119,557 (ferric complex catalyst), German Pat. specification 2,054,019 (cobalt chelant catalyst) Canadian 866,I91 (transition metal-containing salts), U.S.
4,430,243 (chelants with manganese cations and non-catalytic metal cations), and U.S. 4,728,455 (manganese gluconate catalysts).
Preferred are cobalt (III) catalysts having the formula;
Co[~3)nM~mB~bT~tQqPpJ Yy wherein cobalt is in the +3 oxidation state; n is an integer from 0 to 5 (preferably 4 or 5; most preferably 5); M' represents a monodentate ligand; m is an integer from 0 to 5 (preferably 1 or 2; most preferably 1); B' represents a bidentate ligand;
b is an integer from 0 to 2; T' represents a tridentate ligand; t is 0 or 1; Q is a tetradentate ligand; q is 0 or 1; P is a pentadentate ligand; p is 0 or 1; and n + m + 2b +
3t + 4q +
5p = 6; Y is one or more appropriately selected counteranions present in a number y, where y is an integer from 1 to 3 (preferably 2 to 3; most preferably 2 when Y
is a -1 charged anion), to obtain a charge-balanced salt, preferred Y are selected from the group consisting of chloride, nitrate, nitrite, sulfate, citrate, acetate, carbonate, and combinations thereof; and wherein further at least one of the coordination sites attached to the cobalt is labile under automatic dishwashing use conditions and the remaining coordination sites stabilize the cobalt under automatic dishwashing conditions such that the reduction potential for cobalt (III) to cobalt (II) under alkaline conditions is less than about 0.4 volts (preferably less than about 0.2 volts) versus a normal hydrogen electrode.
Preferred cobalt catalysts of this type have the formula:
[Co(NH3)n(M')m) Yy wherein n is an integer from 3 to 5 (preferably 4 or 5; most preferably 5); M' is a labile coordinating moiety, preferably selected from the group consisting of chlorine, bromine, hydroxide, water, and (when, m is greater than 1 ) combinations thereof; m is an integer from 1 to 3 (preferably 1 or 2; most preferably l );
m+n = 6;
and Y is an appropriately selected counteranion present in a number y, which is an integer from 1 to 3 (preferably 2 to 3; most preferably 2 when Y is a -i charged anion), to obtain a charge-balanced salt.
The preferred cobalt catalyst of this type useful herein are cobalt pentaamine chloride salts having the formula [Co(NH3)SCl] Yy, and especially [Co(NH3)SCl]C12.
More preferred are the present invention compositions which utilize cobalt (III) bleach catalysts having the formula:
[Co(NH3)n(Ivnm(B)b~ Ty wherein cobalt is in the +3 oxidation state; n is 4 or 5 (preferably 5); M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2 (preferably 1); B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b=0, then m+n = 6, and when b=1, then m=0 and n=4; and T is ane or more appropriately selected counteranions present in a number y, where y is an integer to obtain a charge-balanced salt (preferably y is 1 to 3; most preferably 2 when T is a -1 charged anion); and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25°C).
Preferred T are selected from the group consisting of chloride, iodide, I3-, formate, nitrate, nitrite, sulfate, sulfite, citrate, acetate, carbonate, bromide, PF6-, BF4 , B(Ph)4', phosphate, phosphite, silicate, tosylaie, methanesulfonate, and combinations thereof. Optionally, T can be protonated if more than one anionic group exists in T, e.g., HP042-, HCO3-, H2P04-, etc. Further, T may be selected from the group consisting of non-traditional inorganic anions such as anionic surfactants (e.g., linear alkylbenzene sulfon~tes (LAS), alkyl sulfates (AS), alkylethoxysulfonates (AES), etc.) and/or anionic polymers (e.g., polyacrylates.
polymethacrylates, etc.).
The M moieties include, but are not limited to, for example, F', S04'2, NCS', SCN', S~03-2> NH3, P043', and carboxylates (which preferably are mono carboxylates, but more than one carboxylate may be present in the moiety as long as the binding to the cobalt is by only one carboxylate per moiety, in which case the other carboxylate in the M moiety may be protonated or in its salt form).
Optionally, M can be protonated if more than one anionic group exists in M
(e.g., HPp42', HC03-, H2P04', HOC(O)CH2C(O)O-, etc.) Preferred M moieties are 1 S substituted and unsubstituted C 1-C30 carboxylic acids having the formulas:
RC(O)O-wherein R is preferably selected from the group consisting of hydrogen and C1-C30 (preferably C1-Clg) unsubstituted and substituted alkyl, C~-C3p (preferably C6-C l g) unsubstituted and substituted aryl, and C3-C30 (preferably CS
C 1 g) unsubstituted and substituted heteroaryl, wherein substituents are selected from the group consisting of -NR'3, -NR'4+, -C(O)OR', -OR', -C(O)NR'2, wherein R' is selected from the group consisting of hydrogen and Cl-C6 moieties. Such substituted R therefore include the moieties -(CH2)nOH and -(CH2)nNR'4'~, wherein n is an integer from 1 to about 16, preferably from about 2 to about 10, and most preferably from about 2 to about S.
Most preferred M are carboxylic acids having the formula above wherein R
is selected from the group consisting of hydrogen, methyl, ethyl, propyl, straight or branched C4-C 12 alkyl, and benzyl. Most preferred R is methyl. Preferred carboxylic acid M moieties include formic, benzoic, octanoic, nonanoic, decanoic, dodecanoic, malonic, malefic, succinic, adipic, phthalic, 2-ethylhexanoic, naphthenoic, oleic, palmitic, triflate, tartrate, stearic, butyric, citric, acrylic, aspartic, fiunaric, lauric, linoleic, lactic, malic, and especially acetic acid.
The B moieties include carbonate, di- and higher carboxylates (e.g., oxalate, malonate, malic, succinate, maleate), picolinic acid, and alpha and beta amino acids (e.g., glycine, alanine, beta-alanine, phenylalanine).
Cobalt bleach catalysts useful herein are known, being described for example S along with their base hydrolysis rates, in M. L. Tobe, "Base Hydrolysis of Transition-Metal Complexes", Adv. Inorg_, Bioinor~. Mech., (1983), 2, pages 1-94.
For example, Table I at page 17, provides the base hydrolysis rates (designated therein as kOH) for cobalt pentaamine catalysts complexed with oxalate (kOH=
2.S
x 10-4 M-1 s-1 (2S°C)), NCS- (kpH= 5.0 x 10-4 M-1 s-1 (25°C)), formate (kOH=
S.8 x 10-4 M-1 s-1 (25°C)), and acetate (kOH= 9.6 x 10-4 M-1 s-l (25°C)). The most preferred cobalt catalyst useful herein are cobalt pentaamine acetate salts having the formula [Co(NH3)SOAc] Ty, wherein OAc represents an acetate moiety, and especially cobalt pentaarnine acetate chloride, [Co(NH3)SOAc]C12; as well as [Co(NH3)SOAc](OAc)2; [Co(NH3)50Ac](PF6)2; [Co(NH3)SOAc](S04); [Co-(NH3)SOAc](BF4)2; and [Co(NH3)SOAc](N03)2 {herein "PAC").
These cobalt catalysts are readily prepared by known procedures, such as taught for example in the Tobe article hereinbefore and the references cited therein, in U.S. Patent 4,810,410, to Diakun et al, issued March 7,1989, J. Chem. Ed.
(1989);
66 (12), 1043-45; The Synthesis and Characterization of Inorganic Compounds, W.L. Jolly (Prentice-Hall; 1970), pp. 461-3; Inor~ Chem., 18, 1497-1502 (1979):
Inorg. Chem., 21, 2881-2885 (1982); Inorg. Chem., 18, 2023-2025 (1979); Inorg.
Synthesis, 173-176 (1960); and Journal of Physical Chemistry, 56, 22-25 (1952); as well as the synthesis examples provided hereinafter.
These catalysts may be coprocessed with adjunct materials so as to reduce the color impact if desired for the aesthetics of the product, or to be included in enzyme-containing particles as exemplified hereinafter, or the compositions may be manufactured to contain catalyst "speckles".
As a practical matter, and not by way of limitation, the cleaning compositions and cleaning processes herein can be adjusted to provide on the order of at least one part per hundred million of the active bleach catalyst species in the aqueous washing medium, and will preferably provide from about 0.01 ppm to about 2S pprn, more preferably from about 0.05 ppm to about 10 ppm, and most preferably from about 0.1 ppm to about 5 ppm, of the bleach catalyst species in the wash liquor. In order to obtain such levels in the wash liquor of an automatic dishwashing 1$
process, typical automatic dishwashing compositions herein will comprise from about 0.0005% to about 0.2%, more preferably frotri about 0.004% to about 0.08%, of bleach catalyst by weight of the cleaning compositions.
Phosphate Builders $ Phosphate detergent builders for use. in ADD compositions are well known.
They include, but are not limited to, the alkali metal, ammonium and alkanolammonium salts of polyphosphates (exemplified by the tripolyphosphates, pyrophosphates, and glassy polymeric mesa-phosphates). Phosphate builder sources are described in detail in Kirk Othmer, 3rd Edition, Vol. 17, pp. 426-472 and in I0 "Advanced Inorganic Chemistry" by Cotton and Wilkinson, pp. 394-400 (John Wiley and Sons, Inc.; 1972).
Preferred levels of phosphate builders herein are from about 10% to about 75%, preferably from about 15% to about 50%, of phosphate builder.
Hvdto~en Peroxide Source 15 Hydrogen peroxide sources are described in detail in the hereinabove incorporated Kirk Othmer's Encyclopedia of Chemical Technology, 4th Ed (1992, John Wiley & Sons), Vol. 4, pp. 271-300 "Bleaching Agents (Survey)", and include the various forms of sodium perborate and sodium percarbonate, including various coated and modified forms. An "effective amount" of a source of hydrogen 20 peroxide is any amount capable of measurably improving stain removal (especially of tea stains) from soiled dishware compared to a hydrogen peroxide source-free composition when the soiled dishware is washed by the consumer in a domestic automatic dishwasher in the presence of alkali.
More generally a source of hydrogen peroxide herein is any convenient 2$ compound or mixture which under consumer use conditions provides an effective amount of hydrogen peroxide. Levels may vary widely and are usually in the range from about 0.1% to about 70%, more typically from about 0.$% to about 30%, by weight of the ADD compositions herein.
The preferred source of hydrogen peroxide used herein can be any 30 convenient source, including hydrogen peroxide itself. For example, perborate, e.g., sodium perborate (any hydrate but preferably the mono- or tetra-hydrate), sodium carbonate peroxyhydrate or equivalent percarbonate salts, sodium pyrophosphate peroxyhydrate, urea peroxyhydrate, or sodium peroxide can be used herein. Also useful are sources of available oxygen such as persuifate bleach (e.g., OXONE, manufactured by DuPont). Sodium perborate monohydrate and sodium percarbonate are particularly preferred. Mixtures of any convenient hydrogen peroxide sources can also be used.
A preferred percarbonate bleach comprises dry particles having an average particle size in the range from about S00 micrometers to about 1,000 micrometers, not more than about 10% by weight of said particles being smaller than about micrometers and not more than about 10% by weight of said particles being larger than about 1,250 micrometers. Optionally, the percarbonate can be coated with a silicate, borate or water-soluble surfactants. Percarbonate is available from various commercial sources such as FMC, Solvay and Tokai Denka.
While effective bleaching compositions herein may comprise only the identified cobalt catalysts and a source of hydrogen peroxide, fully-formulated ADD compositions typically will also comprise other automatic dishwashing detergent adjunct materials to improve or modify performance. These materials are I S selected as appropriate for the properties required of an automatic dishwashing composition. For example, low spotting and filming is desired -- preferred compositions have spotting and filming grades of 3 or less, preferably less than 2, and most preferably less than 1, as measured by the standard test of The American Society for Testing and Materials ("ASTM") D3556-85 (Reapproved 1989) "Standard Test Method for Deposition on Glassware During Mechanical Dishwashing". Also for example, low sudsing is desired -- preferred compositions produce less than 2 inches, more preferably less than 1 inch, of suds in the bottom of the dishwashing machine during normal use conditions (as determined ming known methods such as, for example, that described in U.S. Patent 5,294,365, to Welch et al., issued March 15, 1994).
Adjunct Materials:
Detersive ingredients or adjuncts optionally included in the instant compositions can include one or more materials for assisting or enhancing cleaning performance, treatment of the substrate to be cleaned, or designed to improve the aesthetics of the compositions. They are further selected based on the form of Zhe composition, i.e., whether the composition is to be sold as a liquid, paste (semi-solid), or solid form (including tablets and the preferred granular forms for the present compositions). Adjuncts which can also be included in compositions of the present invention, at their conventional art-established levels for use (generally, adjunct materials comprise, in total, from about 30% to about 99.9%, preferably from about 70% to about 95%, by weight of the coriipositions), include other active ingredients such as low-foaming nonionic surfactants, non-phosphate builders, chelants, enzymes, suds suppressors, dispersant polymers (e.g., from BASF
Core. or Rohm & Haas), color speckles, silvercare, anti-tarnish and/or anti-corrosion agents, dyes, fillers, germicides, alkalinity sources, hydrotropes, anti-oxidants, enzyme stabilizing agents, perfumes, solubilizing agents, carriers, processing aids, pigments.
pH control agents, and, for liquid formulations, solvents, as described in detail hereinafter.
I. Detergent Surfactants:
(a) Low-Foaming Nonionic Surfactant - Surfactants are useful in Automatic Dishwashing to assist cleaning; help defoam food soil foams, especially .from proteins, and to help control spotting/filming and are desirably included in ~
the present detergent compositions at levels of from about O.I% to about 20% of the I5 composition. In general, bleach-stable surfactants are preferred. ADD
(Automatic Dishwashing Detergent) compositions of the present invention prefereably comprise low foaming nonionic surfactants (LFNIs). LFNI can be present in amounts from to about 10% by weight, preferably from about 0.25% to about 4%. LFNIs are most typically used in ADDs on account of the improved water-sheeting action (especially from glass) which they confer to the ADD product. They also encompass non-silicone, nonphosphate polymeric materials further illustrated hereinafter which are known to defoam food soils encountered in automatic dishwashing.
Preferred LFNIs include nonionic alkoxylated surfactants, especially ethoxy fates derived from primary alcohols, and blends thereof with more sophisticated surfactants, such as the polyoxypropylene/polyoxyethylene/polyoxypropylene (POIEOIPO) reverse block polymers. The PO/EO/PO polymer-type surfactants are well-known to have foam suppressing or defoaming action, especially in relation to common food soil ingredients such as egg.
The invention encompasses preferred embodiments wherein LFNI is present, and wherein this component is solid at about 95oF (35~C)> more preferably solid at about 77oF (25oC). For ease of manufacture, a preferred LFNI has a melting point between about 77oF (25oC) and about 140oF (60oC), more preferably between about 80oF (26.6oC) and 1 lOoF (43.3oC).
In a preferred embodiment, the LFNI is an ethoxylated surfactant derived from the reaction of a monohydroxy alcohol or alkylphenol containing from about R
to about 20 carbon atoms, with from about 6 to about 15 moles of ethylene oxide per mole of alcohol or alkyl phenol on an average basis.
A particularly preferred LFNI is derived from a straight chain fatty alcohol.
containing from about 16 to about 20 carbon atoms (C 16-C20 alcohol), preferably a C 18 alcohol, condensed with an average of from about 6 to about 15 moles.
preferably from about 7 to about 12 moles, and most preferably from about 7 to about 9 moles of ethylene oxide per mole of alcohol. Preferably the ethoxylated nonionic surfactant so derived has a narrow ethoxylate distribution relative to the average.
The LFNI can optionally contain propylene oxide in an amount up to about 1 S% by weight. Other preferred LFNI surfactants can be prepared by the processes described in U.S. Patent 4,223,163, issued September 16, 1980, Builloty, incorporated herein by reference.
Highly preferred ADDS herein wherein the LFNI is present make use of ethoxylated monohydroxy alcohol or alkyl phenol and additionally comprise a polyoxyethylene, polyoxypropylene block polymeric compound; the ethoxylated monohydroxy alcohol or alkyl phenol fraction of the LFNI comprising from about 20% to about 100%, preferably from about 30% to about 70%, of the total LFNI.
Suitable block polyoxyethylene-polyoxypropyiene polymeric compounds that meet the requirements described hereinbefore include those based on ethylene glycol, propylene glycol, glycerol, trimethylolpropane and ethylenediamine as initiator reactive hydrogen compound. Polymeric compounds made from a sequential ethoxylation and propoxylation of initiator compounds with a single reactive hydrogen atom, such as C12-18 aliphatic alcohols, do not generally provide satisfactory suds control in the instant ADDs. Certain of the block polymer surfactant compounds designated PLURONIC~ and TETRONIC~ by the BASF-Wyandotte Corp., Wyandotte, Michigan, are suitable in ADD compositions of the invention.
A particularly preferred LFNI contains from about 40% to about 70% of a polyoxypropylene/polyoxyethylene/polyoxypropylene block polymer blend comprising about 75%, by weight of the blend, of a reverse block co-polymer of polyoxyethylene and polyoxypropylene containing 17 moles of ethylene oxide and 44 moles of propylene oxide; and about 25%, by weight of the blend, of a block co-polymer of polyoxyethylene and polyoxypropylene initiated with trimethylolpropane and containing 99 moles of propylene oxide and 24 moles of ethylene oxide per mole of trimethylolpropane.
5 Suitable for use as LFNI in the AIaD compositions are those LFN1 having relatively low cloud points and high hydrophilic-Iipophilic balance (HLB).
Cloud points of 1 % solutions in water are typically below about 32oC and preferably lower, e.g., OoC, for optimum control of sudsing throughout a full range of water temperatures.
LFNIs which may also be used include a Clg alcohol polyethoxylate, having a degree of ethoxylation of about 8, commercially available as SLF18 from Olin Corp., and any biodegradable LFNI having the melting point properties discussed hereinabove.
(,bl. Anionic Co-surfactant - The automatic dishwashing detergent compositions 1 S herein are preferably substantially free from anionic co-surfactants. It has been discovered that certain anionic co-surfactants, particularly fatty carboxylic acids, can cause unsightly ftlms on dishware. Moreover, many anionic surfactants are high foaming. If present, the anionic co-surfactant is typically of a type having good solubility in the presence of calcium. Such anionic co-surfactants are further 20 illustrated by sulfobetaines, alkyl(polyethoxy)suifates (AES), alkyl (polyethoxy)carboxylates, and short chained C6-Clp alkyl sulfates and sulfonates.
2. Detersive Enzymes "Detersive enzyme", as used herein, means any enzyme having a cleaning, stain removing or otherwise beneficial effect in an ADD composition. Preferred 25 detersive enzymes are hydrolases such as proteases, amylases and lipases.
Highly preferred for automatic dishwashing are amylases and/or proteases, including both current commercially available types and improved types which, though more bleach compatible, have a remaining degree of bleach deactivation susceptibility.
In general, as noted, preferred ADD compositions herein comprise one or 30 more detersive enzymes. If only one enzyme is used, it is preferably an amyolytic enzyme when the composition is for automatic dishwashing use. Highly preferred for automatic dishwashing is a mixture of proteolytic enzymes and amyloytic enzymes. More generally, the enzymes to be incorporated include proteases, amylases, lipases, cellulases, and peroxidases, as well as mixtures thereof.
Other types of enzymes may also be included. They may be of any suitable origin;
such as vegetable, animal, bacterial, fungal and yeast origin. However, their choice is governed by several factors such as pH-activity and/or stability optima, thermostability, stability versus active detergents, builders, etc. In this respect 5 bacterial or fungal enzymes are preferred, such as bacterial amylases and proteases, and fungal cellulases.
Enzymes are normally incorporated in the instant detergent compositions at levels sufficient to provide a "cleaning-effective amount". The term "cleaning-effective amount" refers to any amount capable of producing a cleaning, stain 10 removal or soil removal effect on substrates such as fabrics, dishware and the like.
Since enzymes are catalytic materials; such amounts may be very small. In practical terms for current commercial preparations, typical amounts are up to about 5 mg by weight, more typically about 0.01 mg to about 3 mg, of active enzyme per gram ol~
the composition. Stated otherwise, the compositions herein will typically comprise 15 from about 0.001 % to about 6%, preferably 0.01 %-1 % by weight of a commercial enzyme preparation. Protease enzymes are usually present in such commercial preparations at levels sufficient to provide from 0.005 to 0.1 Anson units (AU) of activity per gram of composition. For automatic dishwashing purposes, it may be desirable to increase the active enzyme content of the commercial preparations, in 20 order to minimize the total amount of non-catalytically active materials delivered and thereby improve spotting/filming results.
Suitable examples of proteases are the subtilisins which are obtained from particular strains of B. subtilis and B. licheniformis. Another suitable protease is obtained from a strain of Bacillus, having maximum activity throughout the pH
range of 8-12, developed and sold by Novo Industries AIS as ESPER~~SE~. The preparation of this enzyme and analogous enzymes is described in British Patent Specification No. 1,243,784 of Novo. Proteolytic enzymes suitable for removing protein-based stains that are commercially available include those sold under the tradenames ALCALASE~ and SAVINASE~ by Novo Industries A/S (Denmark) and MAXATASE~ by International Bio-Synthetics, Inc. (The Netherlands). Other proteases include Protease A (see European Patent Application 130,756, published January 9, 1985) and Protease B (see European Patent Application Serial No.
87303761.8, filed April 28, 1987, and European Patent Application 130,756, Bott et al, published January 9, 1985) An especially preferred protease, referred to as "Protease D" is a carbonyl hydroiase variant having an amino acid sequence 'not found in nature, which is derived from a precursor carbonyl hydrolase by substituting a different amino acid for a plurality of amino acid residues. at a position in said carbonyl hydrolase S equivalent to position +76, preferably also in combination with one or more amino acid residue positions equivalent to those selected from the group consisting of +99, +101, +103, +104, +107, +123, +27, +105, +109, +126, +I28, +135, +156, +166, +195, +197, +204, +206, +210, +216, +217, +218, +222, +260, +265, and/or +274 according to the numbering of Bacillus amyloliquefacierrS subtilisin, as described in 10 the patent applications of A. Baeck, et al, entitled "Protease-Containing Cleaning Compositions" having U.S. Serial No. 081322,676, and C. Ghosh, et al, "Bleaching Compositions Comprising Protease Enzymes" having U.S. Serial No. 08/322.,677, both filed October 13, 1994.
Amylases suitable herein include, for example, a-amylases described in 15 British Patent Specification No. 1,296,839 (Novo). RAPIDASE~, International Bio Synthetics, Inc. and TERMAMYL~, Novo Industries.
Engineering of enzymes (e.g., stability-enhanced amylase) for improved stability, e.g., oxidative stability is known. See, for example J.Biological Chem., Vol. 260, No. 1I, June 1985, pp 6518-6521. "Reference amylase" refers to a 20 conventional amylase inside the scope of the amylase component of this invention.
Further, stability-enhanced amylases, also within the invention, are typically compared to these "reference amylases".
The present invention, in certain preferred embodiments, can makes use of amylases having improved stability in detergents, especially improved oxidative 25 stability. A convenient absolute stability reference-point against which amylases used in these preferred embodiments of the instant invention represent a measurable improvement is the stability of TERMAMYL~ in commercial use in 1993 and available from Novo Nordisk A/S. This TERMAMYL~ amylase is a "reference amylase", and is itself well-suited for use in the ADD (Automatic Dishwashing 30 Detergent) compositions of the invention. Even more preferred amylases herein share the characteristic of being "stability-enhanced" amylases, characterized, at a minimum, by a measurable improvement in one or more of: oxidative stability, e.g., to hydrogen peroxideltetraacetylethylenediamine in buffered solution at pH 9-10;
thermal stability, e.g., at common wash temperatures such as about 60oC; or alkaline stability, e.g., at a pH from about 8 to about 11, all measured versus the above-identified reference-amylase. Preferred amylases herein can demonstrate further improvement versus more challenging reference amylases, the latter reference amylases being illustrated by any of the precursor amylases of which preferred S amylases within the invention are variants. Such precursor amylases may themselves be natural or be the product of genetic engineering. Stability can be measured using any of the art-disclosed technical tests. See references disclosed in WO 94102597, itself and documents therein referred to being incorporated by reference.
In general, stability-enhanced amylases respecting the preferred embodiments of the invention can be obtained from Novo Nordisk A/S, or from Genencor International.
Preferred amylases herein have the commonality of being derived using site directed mutagenesis from one or more of the ~ Baccillus amylases, especialy the Bacillus alpha-amylases, regardless of whether one, two or multiple amylase strains are the immediate precursors.
As noted, "oxidative stability-enhanced" amylases are preferred for use herein despite the fact that the invention makes them "optional but preferred"
materials rather than essential. Such amylases are non-limitingly illustrated by the following:
(a) An amylase according to the hereinbefore incorporated WO/94/02597, Novo Nordisk A/S, published Feb. 3, 1994, as further illustrated by a mutant in which substitution is made, using alanine or threonine (preferably threonine), of the methionine residue located in position 197 of the B.licheniformis alpha-amylase, known as TERMAMYL~, or the homologous position variation of a similar parent amylase, such as B. amyloliquefaciens. B.subtilis, or B.stearothermophilas;
(b) Stability-enhanced amylases as described by Genencor International in a paper entitled "Oxidatively Resistant alpha-Amylases" presented at the 207th American Chemical Society National Meeting, March 13-17 1994, by C.
Mitchinson. Therein it was noted that bleaches in automatic dishwashing detergents inactivate alpha-amylases but that improved oxidative stability amylases have been made by Genencor from B.licheniformis NCIB8061. Methionine (Met) was identified as the most likely residue to be modified. Met was substituted, one at a time, in positions 8,15,197,256,304,366 and 438 leading to specific mutants, particularly important being M197L and M197T with the M197T variant being the most stable expressed variant. Stability was measured in CASCADE~ and SUNLIGI-IT~;
(c) Particularly preferred herein are amylase variants having additional modification in the immediate parent available. from Novo Nordisk A/S. These amylases do riot yet have a tradename but are those .referred to by the supplier as QL3 7+M 197T.
Any other oxidative stability-enhanced amylase can be used, for example as derived by site-directed mutagenesis from known chimeric, hybrid or simple mutant parent forms of available amylases.
Cellulases usable in> but not preferred, for the present invention include both bacterial or fungal cellulases. Typically, they will have a pH optimum of between 5 and 9.5. Suitable cellulases are disclosed in U.S. Patent 4,435,307.
Barbesgoard et al, issued March 6, 1984, which discloses fungal cellulase produced from Humicola insolens and Humicola strain DSM1800 or a cellulase 2I2-producing fungus belonging to the genus Aeromonas, and cellulase extracted from the hepatopancreas of a marine mollusk (Dolabella Auricula Solander). Suitable cellulases are also disclosed in GB-A-2.075.028; GB-A-2.095.275 and DE-OS-2.247.832.
CAREZYME~ (Novo) is especially useful.
Suitable lipase enzymes for detergent use include those produced by microorganisms of the Pseudomonas group, such as Pseudomonas stutzeri ATCC
I9.154, as disclosed in British Patent 1,372,034. See also lipases in Japanese Patent Application 53,20487, laid open to public inspection on February 24, 1978.
This lipase is available from Amano Pharmaceutical Co. Ltd., Nagoya, Japan, under the trade name Lipase P "Amano," hereinafter referred to as "Amano-P." Other commercial lipases include Amano-CES, iipases ex Chromobacter viscosum, e.g.
Chromobacter viscosum var. lipolyticum NRRLB 3673, commercially available from Toyo Jozo Co., Tagata, Japan; and further Chromobac~er viscosum lipases from U.S. Biochemical Corp., U.S.A. and Disoynth Co., The Netherlands, and lipases ex Pseudomonas gladioli. The LIPOLASE~ enzyme derived from Humicola lanuginosa and commercially available from Novo (see also EPO
341,947) is a preferred lipase for use herein. Another preferred lipase enzyme is the D96L variant of the native Humicola lanuginosa lipase, as described in WO
92/05249 and Research Disclosure No. 35944, March 10, 1994, both published by Novo. In general, lipolytic enzymes are less preferred than amylases andlor proteases for automatic dishwashing embodiments of the present invention.
Peroxidase enzymes can be used in combination with oxygen sources, e.g., percarbonate, perborate, persulfate, hydrogen peroxide, etc. They are typically used for "solution bleaching," i.e. to prevent transfer of dyes or pigments removed from substrates during wash operations to other substrates in the wash solution.
Peroxidase enzymes are known in the art, and include, for example, horseradish peroxidase, ligninase, and haloperoxidase such as chloro- and bromo-peroxidase.
Peroxidase-containing detergent compositions are disclosed, for example, in PCT
International Application WO 891099813, published October 19, 1989, by O.
Kirk:
assigned to Novo Industries A/S. The present invention encompasses peroxidase-free automatic dishwashing composition embodiments.
A wide range of enzyme materials and means for their incorporation into synthetic detergent compositions are also disclosed in U.S. Patent 3,553,139, issued January 5, 1971 to McCarty et al. Enzymes are further disclosed in U.S. Patent 4,101,457, Place et al, issued July 18, 1978, and in U.S. Patent 4,507,219, Hughes, issued March 26, 1985. Enzymes for use in detergents can be stabilized by various techniques. Enzyme stabilization techniques are disclosed and exemplified in U.S:
Patent 3,600,319, issued August 17, 1971 to Gedge, et al, and European Patent Application Publication No. 0 199 405, Application No. 86200586.x, published October 29, 1986, Venegas. Enzyme stabilization systems are also described, for example, in U.S. Patent 3,519,570.
Via) Enzyme Stabilizing System - The enzyme-containing compositions, especially liquid compositions, herein may comprise from about 0.001% to about 10%, preferably from about 0.005% to about 8%, most preferably from about 0.01 % to about 6%, by weight of an enzyme stabilizing system. The enzyme stabilizing system can be any stabilizing system which is compatible with ttue detersive enzyme. Such stabilizing systems can comprise calcium ion, boric acid, propylene glycol, short chain carboxylic acid, boronic acid, and mixtures thereof.
The stabilizing system of the ADDS herein may further comprise from 0 to about 10%, preferably from about 0.01 % to about 6% by weight, of chlorine bleach scavengers, added to prevent chlorine bleach species present in many water supplies from attacking and inactivating the enzymes, especially under alkaline conditions.
While chlorine levels in water may be small, typically in the range from about 0.5 ppm to about 1.75 ppm, the available chlorine in the total volume of water that comes in contact with the enzyme during dishwashing is relatively large;
accordingly, enzyme stability in-use can be probleri~atic, Suitable chlorine scavenger anions are widely known and readily available>
5 and are illustrated by salts containing ammonium cations with sulfite, bisulfate, thiosulfite> thiosulfate, iodide, etc. Antioxidants such as carbamate, ascorbate, etc., organic amines such as ethylenediamineteiracetic acid (EDTA) or alkali metal salt thereof, monoethanolamine (MEA); and mixtures thereof can likewise be used.
Other conventional scavengers such as bisulfate, nitrate, chloride, sources of 10 hydrogen peroxide such as sodium perborate tetrahydrate, sodium perborate monohydrate and sodium percarbonate, as well as phosphate, condensed phosphate, acetate, benzoate, citrate, formate, lactate, malate, tartrate, salicylate, etc., and mixtures thereof can be used if desired. In general, since the chlorine scavenger function can be performed by several of the ingredients separately listed under better 15 recognized functions, (e.g., other components of the invention such as sodium perborate), there is no requirement to add a separate chlorine scavenger unless a compound performing that function to the desired extent is absent from an enzyme-containing embodiment of the invention; even then, the scavenger is added only for optimum results. Moreover, the formulator will exercise a chemist's normal skill in 20 avoiding the use of any scavenger which is majorly incompatible with other ingredients, if used. In relation to the use of ammonium salts, such salts can be simply admixed with the detergent composition but are prone to adsorb water andlor liberate ammonia during storage. Accordingly, such materials, if present, are desirably protected in a particle such as that described in U.S. Patent 4,652,392, 25 Baginski et al.
3. Optional Bleach Adiuncts Via) Bleach Activators -Preferably, the peroxygen bleach component in the composition is formulated with an activator (peracid precursor). The activator is present at levels of from about 0:01 % to about 15%, preferably from about 1 % to about 1 U%, more preferably from about 1% to about 8%, by weight of the composition. Preferred activators are selected from the group consisting of tetraacetyl ethylene diamine (TAED), benzoylcaprolactam (BzCL), 4-nitrobenzoylcaprolactam, 3-chlorobenzoyl-caprolactam, benzoyloxybenzenesulphonate (BOBS), nonanoyloxybenzene-suiphonate (HOBS), phenyl benzoate (PhBz), decanoyloxybenzenesulphonate (C10' OBS),' benzoylvalerolactam (BZVL), octanoyloxybenzenesulphonate (Cg-OBS), perhydrolyzable esters and mixtures thereof, most preferably benzoylcaprolactam and benzoylvalerolactam. Particularly preferred bleach activators in the pH
range from about 8 to about 9.5 are those selected having an OBS or VL leaving group.
Preferred bleach activators are those described in U.S. Patent 5,130.045, Mitchell et al, and 4,412,934; Chung et al, and copending patent applications U. S.
Serial Nos. 08/064,624, 08/064,623, 08/064,621, 08/064,562, 08/064,564, 08/082,270 and copending application to M. Burns, A. D. Willey, R. T.
Hartshorn, C. K. Ghosh, entitled "Bleaching Compounds Comprising Peroxyacid Activators Used With Enzymes" and having U.S. Serial No. 08/133.691 (P&G Case 4890R), all of which are incorporated herein by reference.
The mole ratio of peroxygen bleaching compound (as Av0) to bleach activator in the present invention generally ranges from at least 1:1, preferably from about 20:1 to about 1:1, more preferably from about 10:1 to about 3:1.
Quaternary substituted bleach activators may also be included. The present detergent compositions preferably comprise a quaternary substituted bleach activator (QSBA) or a quaternary substituted peracid (QSP); more preferably, the former:
Preferred QSBA structures are further described in copending U.S. Serial No.
08/298,903, 08/298,650, 081298,906 and 081298,904 filed August 31, 1994, incorporated herein by reference.
(b) Organic Peroxides especially Diacvl Peroxides - These are extensively illustrated in Kirk Othmer, Encyclopedia of Chemical Technology, Vol. 17, John Wiley and Sons, 1982 at pages 27-90 and especially at pages 63-72, all incorporated herein by reference. If a diacyl peroxide is used, it will preferably be one which exerts minimal adverse impact on spotting/filming.
4. nH and Bufferine Variation Many detergent compositions herein will be buffered, i.e., they are relatively resistant to pH drop in the presence of acidic soils. However, other compositions herein may have exceptionally low buffering capacity, or may be substantially unbuffered. Techniques for controlling or varying pH at recommended Usage levels more generally include the use of not only buffers, but also additional alkalis, acids, pH jump systems, dual compartment containers, etc., and are well known to those skilled in the art.
The preferred ADD compositions herein comprise a pH-adjusting component selected from water-soluble alkaline inorganic salts and water-soluble organic or inorganic builders. The pH-adjusting components are selected so that when the ADD is dissolved in water at a concentration of 1,000 - 5,000 ppm, the pH
remains in the range of above about 8, preferably frorp about 9.5 to about 1 I . The preferred nonphosphate pH-adjusting component of the invention is selected from the group consisting of:
(i) sodium carbonate or sesquicarbonate;
(ii) sodium silicate, preferably hydrous sodium silicate having Si02:Na20 ratio I O of from about 1:1 to about 2:1, and mixtures thereof with limited quantites of sodium metasilicate;
(iii) sodium citrate;
(iv) citric acid;
(v) sodium bicarbonate;
I S (vi) sodium borate, preferably borax;
(vii) sodium hydroxide; and (viii) mixtures of (i~(vii).
Preferred embodiments contain low levels of silicate (i.e. from about 3% to about 10% Si02).
20 Illustrative of highly preferred pH-adjusting component systems are binary mixtures of granular sodium citrate with anhydrous sodium carbonate, and three-component mixtures of granular sodium citrate trihydrate, citric acid monohydrate and anhydrous sodium carbonate.
The amount of the pH adjusting component in the instant ADD compositions 25 is preferably from about 1% to about 50%, by weight of the composition. In a preferred embodiment, the pH-adjusting component is present in the ADD
composition in an amount from about 5% to about 40%, preferably from about 10%
to about 30%, by weight.
For compositions herein having a pH between about 9.5 and about 11 of the 30 initial wash solution, particularly preferred ADD embodiments comprise, by weight of ADD, from about 5% to about 40%, preferably from about 10% to about 30%, most preferably from about 15% to about 20%, of sodium citrate with from about 5% to about 30%, preferably from about 7% to 25%, most preferably from about
In general, materials used for the production of ADD compositions herein are preferably checked for compatibility with spotting/filming on glassware.
Test 1 S methods for spotting/filming are generally described in the automatic dishwashing detergent literature, including DIN test methods. Certain oily materials, especially at longer chain lengths, and insoluble materials such as clays, as well as long-chain fatty acids or soaps which form soap scum are therefore preferably limited or excluded from the instant compositions.
Amounts of the essential ingredients can vary within wide ranges, however preferred automatic dishwashing detergent compositions herein (which have a 1 aqueous solution pH of from about 7 to about 12, more preferably from about 9 to about 11.5, and most preferably less than about 11, especially from about 9 to about I I ) are those wherein there is present: from about 10% to about 75%, preferably from about I S% to about SO%, of phosphate builder; from about 0.1 % to about 70%, preferably from about 0.5% to about 30%, of a source of hydrogen peroxide;
from about 0.0001 % to about 1 %, preferably from about 0.005% to about 0.1 %, of a metal-containing bleach catalyst (most preferred cobalt catalysts useful herein are present at from about 0.005% to about 0.01%); from about 0.1% to about 40%, preferably from about 0.1% to about 20% of a water-soluble (two ratio) silicate; and from about 0.1 % to about 20% , preferably from about 0.1 % to about 10% of a low-foaming nonionic surfactant. Such fully-formulated embodiments typically further comprise from about 0.1 % to about I S% of a polymeric dispersant, from about 0.01 % to about 10% of a chelant, and from about 0.00001 % to about 10% of a g detersive enzyme though further additional or adjunct ingredients may be present.
Detergent compositions herein in granular form typically limit water content, for example to less than about 7% free water, for best storage stability.
Further, preferred ADD compositions of this invention are substantially free of chlorine bleach. By "substantially free" of chlorine bleach is meant that the formulator does not deliberately add a chlorine-containing bleach additive, such as a chloroisocyanurate, to the preferred ADD composition. However, it is recognized that because of factors outside the control of the formulator, such as chlorination of the water supply, some non-zero amount of chlorine bleach may be present in the wash liquor. The term "substantially free" can be similarly constructed with reference to preferred limitation of other ingredients.
By "effective amount" herein is meant an amount which is sufficient, under whatever comparative test conditions are employed, to enhance cleaning of a soiled surface. Likewise, the term "catalyticaliy effective amount" refers to an amount of metal-containing bleach catalyst which is sufficient under whatever comparative test conditions are employed, to enhance cleaning of the soiled surface. In automatic dishwashing, the soiled surface may be, for example, a porcelain cup with tea stain, dishes soiled with simple starches or more complex food soils, or a plastic spatula stained with tomato soup. The test conditions will vary, depending on the type of washing appliance used and the habits of the user. Some maclvnes have considerably longer wash cycles than others. Some users elect to use warm water without a great deal of heating inside the appliance; others use wanm or even cold water fill, followed by a warm-up through a built-in electrical coil. Of course, the performance of bleaches and enzymes will be affected by such considerations, and the levels used in fully-formulated detergent and cleaning compositions can be appropriately adjusted.
Metal-containingyBleach Catalysts:
The present invention compositions and methods utilize metal-containing bleach catalysts that are effective for use in ADD compositions. Preferred are manganese and cobalt-containing bleach catalysts.
One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal ration of defined bleach catalytic activity, such as copper, iron, titanium, ruthenium tungsten, molybdenum, or manganese rations, an auxiliary metal ration having little or no bleach catalytic activity, such as zinc or aluminum canons, and a sequestrate having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, ethylenediaminetetra (methylenephosphonic acid) and water-soluble salts thereof.
Such catalysts are disclosed in U.S. Pat. 4,430,243.
S Other types of bleach catalysts include .the manganese-based complexes disclosed in U.S. Pat. 5,246,621 and U.S. Pat. 5,244,594. Preferred examples of theses catalysts include MnIV2(u-O)3(I,4,7-trimethyl-1,4,7-triazacyclononane)~-(PF6)2 ("MnTACN"), MnIII2(u-O)1(u-OAc)2(1,4,7-trimethyl-1,4,7-triazacyclono-nane)2-(C104)2, MnIV4(u-O)6(1,4;7-triazacyclononane)4-(CI04)2, MnIIIMnIV4(u_ O)I(u-OAc)2(1,4,7-trimethyl-1,4,7-triazacyclononaner-(C104)3, and mixtures thereof. See also European patent application publication no. 549,272. Other ligands suitable for use herein include 1,5,9-trimethyl-I,5,9-triazacyclododecarle, 2-methyl-1,4,7-triazacyclononane, 2-methyl-1,4,7-triazacyclononane, and mixtures thereof.
The bleach catalysts useful in automatic dishwashing compositions and concentrated powder detergent compositions may also be selected as appropriate for the present invention. For examples of suitable bleach catalysts see U.S. Pat.
4,246,612 and U.S. Pat. 5,227,084.
See also U.S. Pat. 5,194,416 which teaches mononuclear manganese {IV) complexes such as Mn(1,4,7-trimethyl-1,4;7-triazacyclononane(OCH3)3-(PF6).
Still another type of bleach catalyst, as disclosed in U.S. Pat. 5,114,606, is a water-soluble complex of manganese (II), (III), and/or (IV) with a ligand which is a non-carboxylate polyhydroxy compound having at least three consecutive C-OH
groups. Preferred ligands include sorbitol, iditol, dulsitol, mannitol, xylitol, arabitol, adonitol, meso-erythritol, meso-inositol, lactose, and mixtwes thereof.
U.S. Pat. 5,114,611 leaches a bleach catalyse comprising a complex of transition metals, including Mn, Co, Fe, or Cu, with an non-(macro)-cyclic iigand.
Said ligands are of the formula:
Ri R3 RL--N=C-B-C=N-R°
wherein Rl, R2, R3, and R4 can each be selected from H, substituted alkyl and aryl groups such that each RI-N=C-R2 and R3-C=N-R4 form a five or six-membered ring. Said ring can further be substituted. B is a bridging group selected from O, S.
CRSR6, NR~ and C=O, wherein R5, R6, and R~ can each be H, alkyl, or aryl groups, including substituted or unsubstituted groups. Preferred ligands include pyridine, pyridazine, pyrimidine, pyrazine, imidazole, pyrazole, and triazole rings.
Optionally, said rings may be substituted with substituents such as alkyl, aryl, 5 alkoxy, halide, and nitro. Particularly preferred is the ligand 2;2'-bispyridylamine.
Preferred bleach catalysts include Co, Cu, Mn, Fe,-bispyridylmethane and -bispyridylamine complexes. Highly preferred catalysts include Co(2,2'-bispyridylamine)C12, Di(isothiocyanato)bispyridylamine-cobalt (II), trisdipyridylamine-cobalt(II) perchlorate, Co(2,2-bispyridylamine)202CI04, Bis-10 (2,2'-bispyridylamine) copper(II) perchlorate, tris(di-2-pyridylamine) iron(II) perchlorate, and mixtures thereof.
Other examples include Mn gluconate, Mn(CF3S03)~, Co(NH3)SCI, and_ the binuclear Mn complexed with tetra-N-dentate and bi-N-dentate ligands, including N4MnIII(u_O)~MnIVN4)+and (BipY2MnIII(u_O)2MnIVbipY2~-(C104)3~
1 S The bleach catalysts may also be prepared by combining a water-soluble ligand with a water-soluble manganese salt in aqueous media and concentrating the resulting mixture by evaporation. Any convenient water-soluble salt of manganese can be used herein. Manganese (II), (III), (IV) and/or (V) is readily available on a commercial scale. In some instances, sufficient manganese may be present in the wash liquor, but, in general, it is preferred to detergent composition Mn ca~ions in the compositions to ensure its presence in catalytically-effective amounts.
Thus, the sodium salt of the ligand and a member selected from the group consisting of MnS04, Mn(C104)2 or MnCl2 (least preferred) are dissolved in water at molar ratios of ligand:Mn salt in the range of about I :4 to 4:1 at neutral or slightly alkaline pH. The water may first be de-oxygenated by boiling and cooled by spraying with nitrogen. The resulting solution is evaporated (under N2, if desired) and the resulting solids are used in the bleaching and detergent compositions herein without further purification.
In an alternate mode, the water-soluble manganese source, such as MnS04, is added to the bleach/cleaning composition or to the aqueous bleaching/cleaning bath which comprises the ligand. Some type of complex is apparently formed in situ, and improved bleach performance is secured. In such an in situ process, it is convenient to use a considerable molar excess of the ligand over the manganese, and mole ratios of ligand:Mn typically are 3:1 to 15:1. The additional ligand also serves to scavenge vagrant metal ions such as iron and copper, thereby protecting the bleach from decomposition. Orie possible such system is described in European patent application, publication no. 549,271.
While the structures of the bleach-catalyzing manganese complexes of the present invention have not been elucidated, it may be speculated that they comprise chelates or other hydrated coordination complexes which result from the interaction of the carboxyl and nitrogen atoms of the ligand with the manganese cation.
Likewise, the oxidation state of the manganese cation during the catalytic process is not known with certainty, and may be the (+II), (+III), (+IV) or (+V) valence state.
Due to the ligands' possible six points of attachment to the manganese cation, it may be reasonably speculated that mufti-nuclear species andlor "cage" structures may exist in the aqueous bleaching media. Whatever the form of the active Mwiigand species which actually exists, it functions in an apparently catalytic manner to provide improved bleaching performances on stubborn stains such as tea, ketchup, coffee, wine, juice, and the like.
Other bleach catalysts are described, for example, in European patent application, publication no. 408,131 (cobalt complex catalysts), European patent applications, publication nos. 384,503, and 306,089 (metallo-porphyrin catalysts), U.S. 4,728,455 (manganese/multidentate ligand catalyst), U.S. 4,71I,748 and European patent application, publication no. 224,952, (absorbed manganese on aluminosilicate catalyst), U.S. 4,601,845 (aluminosilicate support with manganese and zinc or magnesium salt), U.S. 4,626,373 (manganese/ligand catalyst), U.S.
4,119,557 (ferric complex catalyst), German Pat. specification 2,054,019 (cobalt chelant catalyst) Canadian 866,I91 (transition metal-containing salts), U.S.
4,430,243 (chelants with manganese cations and non-catalytic metal cations), and U.S. 4,728,455 (manganese gluconate catalysts).
Preferred are cobalt (III) catalysts having the formula;
Co[~3)nM~mB~bT~tQqPpJ Yy wherein cobalt is in the +3 oxidation state; n is an integer from 0 to 5 (preferably 4 or 5; most preferably 5); M' represents a monodentate ligand; m is an integer from 0 to 5 (preferably 1 or 2; most preferably 1); B' represents a bidentate ligand;
b is an integer from 0 to 2; T' represents a tridentate ligand; t is 0 or 1; Q is a tetradentate ligand; q is 0 or 1; P is a pentadentate ligand; p is 0 or 1; and n + m + 2b +
3t + 4q +
5p = 6; Y is one or more appropriately selected counteranions present in a number y, where y is an integer from 1 to 3 (preferably 2 to 3; most preferably 2 when Y
is a -1 charged anion), to obtain a charge-balanced salt, preferred Y are selected from the group consisting of chloride, nitrate, nitrite, sulfate, citrate, acetate, carbonate, and combinations thereof; and wherein further at least one of the coordination sites attached to the cobalt is labile under automatic dishwashing use conditions and the remaining coordination sites stabilize the cobalt under automatic dishwashing conditions such that the reduction potential for cobalt (III) to cobalt (II) under alkaline conditions is less than about 0.4 volts (preferably less than about 0.2 volts) versus a normal hydrogen electrode.
Preferred cobalt catalysts of this type have the formula:
[Co(NH3)n(M')m) Yy wherein n is an integer from 3 to 5 (preferably 4 or 5; most preferably 5); M' is a labile coordinating moiety, preferably selected from the group consisting of chlorine, bromine, hydroxide, water, and (when, m is greater than 1 ) combinations thereof; m is an integer from 1 to 3 (preferably 1 or 2; most preferably l );
m+n = 6;
and Y is an appropriately selected counteranion present in a number y, which is an integer from 1 to 3 (preferably 2 to 3; most preferably 2 when Y is a -i charged anion), to obtain a charge-balanced salt.
The preferred cobalt catalyst of this type useful herein are cobalt pentaamine chloride salts having the formula [Co(NH3)SCl] Yy, and especially [Co(NH3)SCl]C12.
More preferred are the present invention compositions which utilize cobalt (III) bleach catalysts having the formula:
[Co(NH3)n(Ivnm(B)b~ Ty wherein cobalt is in the +3 oxidation state; n is 4 or 5 (preferably 5); M is one or more ligands coordinated to the cobalt by one site; m is 0, 1 or 2 (preferably 1); B is a ligand coordinated to the cobalt by two sites; b is 0 or 1 (preferably 0), and when b=0, then m+n = 6, and when b=1, then m=0 and n=4; and T is ane or more appropriately selected counteranions present in a number y, where y is an integer to obtain a charge-balanced salt (preferably y is 1 to 3; most preferably 2 when T is a -1 charged anion); and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23 M-1 s-1 (25°C).
Preferred T are selected from the group consisting of chloride, iodide, I3-, formate, nitrate, nitrite, sulfate, sulfite, citrate, acetate, carbonate, bromide, PF6-, BF4 , B(Ph)4', phosphate, phosphite, silicate, tosylaie, methanesulfonate, and combinations thereof. Optionally, T can be protonated if more than one anionic group exists in T, e.g., HP042-, HCO3-, H2P04-, etc. Further, T may be selected from the group consisting of non-traditional inorganic anions such as anionic surfactants (e.g., linear alkylbenzene sulfon~tes (LAS), alkyl sulfates (AS), alkylethoxysulfonates (AES), etc.) and/or anionic polymers (e.g., polyacrylates.
polymethacrylates, etc.).
The M moieties include, but are not limited to, for example, F', S04'2, NCS', SCN', S~03-2> NH3, P043', and carboxylates (which preferably are mono carboxylates, but more than one carboxylate may be present in the moiety as long as the binding to the cobalt is by only one carboxylate per moiety, in which case the other carboxylate in the M moiety may be protonated or in its salt form).
Optionally, M can be protonated if more than one anionic group exists in M
(e.g., HPp42', HC03-, H2P04', HOC(O)CH2C(O)O-, etc.) Preferred M moieties are 1 S substituted and unsubstituted C 1-C30 carboxylic acids having the formulas:
RC(O)O-wherein R is preferably selected from the group consisting of hydrogen and C1-C30 (preferably C1-Clg) unsubstituted and substituted alkyl, C~-C3p (preferably C6-C l g) unsubstituted and substituted aryl, and C3-C30 (preferably CS
C 1 g) unsubstituted and substituted heteroaryl, wherein substituents are selected from the group consisting of -NR'3, -NR'4+, -C(O)OR', -OR', -C(O)NR'2, wherein R' is selected from the group consisting of hydrogen and Cl-C6 moieties. Such substituted R therefore include the moieties -(CH2)nOH and -(CH2)nNR'4'~, wherein n is an integer from 1 to about 16, preferably from about 2 to about 10, and most preferably from about 2 to about S.
Most preferred M are carboxylic acids having the formula above wherein R
is selected from the group consisting of hydrogen, methyl, ethyl, propyl, straight or branched C4-C 12 alkyl, and benzyl. Most preferred R is methyl. Preferred carboxylic acid M moieties include formic, benzoic, octanoic, nonanoic, decanoic, dodecanoic, malonic, malefic, succinic, adipic, phthalic, 2-ethylhexanoic, naphthenoic, oleic, palmitic, triflate, tartrate, stearic, butyric, citric, acrylic, aspartic, fiunaric, lauric, linoleic, lactic, malic, and especially acetic acid.
The B moieties include carbonate, di- and higher carboxylates (e.g., oxalate, malonate, malic, succinate, maleate), picolinic acid, and alpha and beta amino acids (e.g., glycine, alanine, beta-alanine, phenylalanine).
Cobalt bleach catalysts useful herein are known, being described for example S along with their base hydrolysis rates, in M. L. Tobe, "Base Hydrolysis of Transition-Metal Complexes", Adv. Inorg_, Bioinor~. Mech., (1983), 2, pages 1-94.
For example, Table I at page 17, provides the base hydrolysis rates (designated therein as kOH) for cobalt pentaamine catalysts complexed with oxalate (kOH=
2.S
x 10-4 M-1 s-1 (2S°C)), NCS- (kpH= 5.0 x 10-4 M-1 s-1 (25°C)), formate (kOH=
S.8 x 10-4 M-1 s-1 (25°C)), and acetate (kOH= 9.6 x 10-4 M-1 s-l (25°C)). The most preferred cobalt catalyst useful herein are cobalt pentaamine acetate salts having the formula [Co(NH3)SOAc] Ty, wherein OAc represents an acetate moiety, and especially cobalt pentaarnine acetate chloride, [Co(NH3)SOAc]C12; as well as [Co(NH3)SOAc](OAc)2; [Co(NH3)50Ac](PF6)2; [Co(NH3)SOAc](S04); [Co-(NH3)SOAc](BF4)2; and [Co(NH3)SOAc](N03)2 {herein "PAC").
These cobalt catalysts are readily prepared by known procedures, such as taught for example in the Tobe article hereinbefore and the references cited therein, in U.S. Patent 4,810,410, to Diakun et al, issued March 7,1989, J. Chem. Ed.
(1989);
66 (12), 1043-45; The Synthesis and Characterization of Inorganic Compounds, W.L. Jolly (Prentice-Hall; 1970), pp. 461-3; Inor~ Chem., 18, 1497-1502 (1979):
Inorg. Chem., 21, 2881-2885 (1982); Inorg. Chem., 18, 2023-2025 (1979); Inorg.
Synthesis, 173-176 (1960); and Journal of Physical Chemistry, 56, 22-25 (1952); as well as the synthesis examples provided hereinafter.
These catalysts may be coprocessed with adjunct materials so as to reduce the color impact if desired for the aesthetics of the product, or to be included in enzyme-containing particles as exemplified hereinafter, or the compositions may be manufactured to contain catalyst "speckles".
As a practical matter, and not by way of limitation, the cleaning compositions and cleaning processes herein can be adjusted to provide on the order of at least one part per hundred million of the active bleach catalyst species in the aqueous washing medium, and will preferably provide from about 0.01 ppm to about 2S pprn, more preferably from about 0.05 ppm to about 10 ppm, and most preferably from about 0.1 ppm to about 5 ppm, of the bleach catalyst species in the wash liquor. In order to obtain such levels in the wash liquor of an automatic dishwashing 1$
process, typical automatic dishwashing compositions herein will comprise from about 0.0005% to about 0.2%, more preferably frotri about 0.004% to about 0.08%, of bleach catalyst by weight of the cleaning compositions.
Phosphate Builders $ Phosphate detergent builders for use. in ADD compositions are well known.
They include, but are not limited to, the alkali metal, ammonium and alkanolammonium salts of polyphosphates (exemplified by the tripolyphosphates, pyrophosphates, and glassy polymeric mesa-phosphates). Phosphate builder sources are described in detail in Kirk Othmer, 3rd Edition, Vol. 17, pp. 426-472 and in I0 "Advanced Inorganic Chemistry" by Cotton and Wilkinson, pp. 394-400 (John Wiley and Sons, Inc.; 1972).
Preferred levels of phosphate builders herein are from about 10% to about 75%, preferably from about 15% to about 50%, of phosphate builder.
Hvdto~en Peroxide Source 15 Hydrogen peroxide sources are described in detail in the hereinabove incorporated Kirk Othmer's Encyclopedia of Chemical Technology, 4th Ed (1992, John Wiley & Sons), Vol. 4, pp. 271-300 "Bleaching Agents (Survey)", and include the various forms of sodium perborate and sodium percarbonate, including various coated and modified forms. An "effective amount" of a source of hydrogen 20 peroxide is any amount capable of measurably improving stain removal (especially of tea stains) from soiled dishware compared to a hydrogen peroxide source-free composition when the soiled dishware is washed by the consumer in a domestic automatic dishwasher in the presence of alkali.
More generally a source of hydrogen peroxide herein is any convenient 2$ compound or mixture which under consumer use conditions provides an effective amount of hydrogen peroxide. Levels may vary widely and are usually in the range from about 0.1% to about 70%, more typically from about 0.$% to about 30%, by weight of the ADD compositions herein.
The preferred source of hydrogen peroxide used herein can be any 30 convenient source, including hydrogen peroxide itself. For example, perborate, e.g., sodium perborate (any hydrate but preferably the mono- or tetra-hydrate), sodium carbonate peroxyhydrate or equivalent percarbonate salts, sodium pyrophosphate peroxyhydrate, urea peroxyhydrate, or sodium peroxide can be used herein. Also useful are sources of available oxygen such as persuifate bleach (e.g., OXONE, manufactured by DuPont). Sodium perborate monohydrate and sodium percarbonate are particularly preferred. Mixtures of any convenient hydrogen peroxide sources can also be used.
A preferred percarbonate bleach comprises dry particles having an average particle size in the range from about S00 micrometers to about 1,000 micrometers, not more than about 10% by weight of said particles being smaller than about micrometers and not more than about 10% by weight of said particles being larger than about 1,250 micrometers. Optionally, the percarbonate can be coated with a silicate, borate or water-soluble surfactants. Percarbonate is available from various commercial sources such as FMC, Solvay and Tokai Denka.
While effective bleaching compositions herein may comprise only the identified cobalt catalysts and a source of hydrogen peroxide, fully-formulated ADD compositions typically will also comprise other automatic dishwashing detergent adjunct materials to improve or modify performance. These materials are I S selected as appropriate for the properties required of an automatic dishwashing composition. For example, low spotting and filming is desired -- preferred compositions have spotting and filming grades of 3 or less, preferably less than 2, and most preferably less than 1, as measured by the standard test of The American Society for Testing and Materials ("ASTM") D3556-85 (Reapproved 1989) "Standard Test Method for Deposition on Glassware During Mechanical Dishwashing". Also for example, low sudsing is desired -- preferred compositions produce less than 2 inches, more preferably less than 1 inch, of suds in the bottom of the dishwashing machine during normal use conditions (as determined ming known methods such as, for example, that described in U.S. Patent 5,294,365, to Welch et al., issued March 15, 1994).
Adjunct Materials:
Detersive ingredients or adjuncts optionally included in the instant compositions can include one or more materials for assisting or enhancing cleaning performance, treatment of the substrate to be cleaned, or designed to improve the aesthetics of the compositions. They are further selected based on the form of Zhe composition, i.e., whether the composition is to be sold as a liquid, paste (semi-solid), or solid form (including tablets and the preferred granular forms for the present compositions). Adjuncts which can also be included in compositions of the present invention, at their conventional art-established levels for use (generally, adjunct materials comprise, in total, from about 30% to about 99.9%, preferably from about 70% to about 95%, by weight of the coriipositions), include other active ingredients such as low-foaming nonionic surfactants, non-phosphate builders, chelants, enzymes, suds suppressors, dispersant polymers (e.g., from BASF
Core. or Rohm & Haas), color speckles, silvercare, anti-tarnish and/or anti-corrosion agents, dyes, fillers, germicides, alkalinity sources, hydrotropes, anti-oxidants, enzyme stabilizing agents, perfumes, solubilizing agents, carriers, processing aids, pigments.
pH control agents, and, for liquid formulations, solvents, as described in detail hereinafter.
I. Detergent Surfactants:
(a) Low-Foaming Nonionic Surfactant - Surfactants are useful in Automatic Dishwashing to assist cleaning; help defoam food soil foams, especially .from proteins, and to help control spotting/filming and are desirably included in ~
the present detergent compositions at levels of from about O.I% to about 20% of the I5 composition. In general, bleach-stable surfactants are preferred. ADD
(Automatic Dishwashing Detergent) compositions of the present invention prefereably comprise low foaming nonionic surfactants (LFNIs). LFNI can be present in amounts from to about 10% by weight, preferably from about 0.25% to about 4%. LFNIs are most typically used in ADDs on account of the improved water-sheeting action (especially from glass) which they confer to the ADD product. They also encompass non-silicone, nonphosphate polymeric materials further illustrated hereinafter which are known to defoam food soils encountered in automatic dishwashing.
Preferred LFNIs include nonionic alkoxylated surfactants, especially ethoxy fates derived from primary alcohols, and blends thereof with more sophisticated surfactants, such as the polyoxypropylene/polyoxyethylene/polyoxypropylene (POIEOIPO) reverse block polymers. The PO/EO/PO polymer-type surfactants are well-known to have foam suppressing or defoaming action, especially in relation to common food soil ingredients such as egg.
The invention encompasses preferred embodiments wherein LFNI is present, and wherein this component is solid at about 95oF (35~C)> more preferably solid at about 77oF (25oC). For ease of manufacture, a preferred LFNI has a melting point between about 77oF (25oC) and about 140oF (60oC), more preferably between about 80oF (26.6oC) and 1 lOoF (43.3oC).
In a preferred embodiment, the LFNI is an ethoxylated surfactant derived from the reaction of a monohydroxy alcohol or alkylphenol containing from about R
to about 20 carbon atoms, with from about 6 to about 15 moles of ethylene oxide per mole of alcohol or alkyl phenol on an average basis.
A particularly preferred LFNI is derived from a straight chain fatty alcohol.
containing from about 16 to about 20 carbon atoms (C 16-C20 alcohol), preferably a C 18 alcohol, condensed with an average of from about 6 to about 15 moles.
preferably from about 7 to about 12 moles, and most preferably from about 7 to about 9 moles of ethylene oxide per mole of alcohol. Preferably the ethoxylated nonionic surfactant so derived has a narrow ethoxylate distribution relative to the average.
The LFNI can optionally contain propylene oxide in an amount up to about 1 S% by weight. Other preferred LFNI surfactants can be prepared by the processes described in U.S. Patent 4,223,163, issued September 16, 1980, Builloty, incorporated herein by reference.
Highly preferred ADDS herein wherein the LFNI is present make use of ethoxylated monohydroxy alcohol or alkyl phenol and additionally comprise a polyoxyethylene, polyoxypropylene block polymeric compound; the ethoxylated monohydroxy alcohol or alkyl phenol fraction of the LFNI comprising from about 20% to about 100%, preferably from about 30% to about 70%, of the total LFNI.
Suitable block polyoxyethylene-polyoxypropyiene polymeric compounds that meet the requirements described hereinbefore include those based on ethylene glycol, propylene glycol, glycerol, trimethylolpropane and ethylenediamine as initiator reactive hydrogen compound. Polymeric compounds made from a sequential ethoxylation and propoxylation of initiator compounds with a single reactive hydrogen atom, such as C12-18 aliphatic alcohols, do not generally provide satisfactory suds control in the instant ADDs. Certain of the block polymer surfactant compounds designated PLURONIC~ and TETRONIC~ by the BASF-Wyandotte Corp., Wyandotte, Michigan, are suitable in ADD compositions of the invention.
A particularly preferred LFNI contains from about 40% to about 70% of a polyoxypropylene/polyoxyethylene/polyoxypropylene block polymer blend comprising about 75%, by weight of the blend, of a reverse block co-polymer of polyoxyethylene and polyoxypropylene containing 17 moles of ethylene oxide and 44 moles of propylene oxide; and about 25%, by weight of the blend, of a block co-polymer of polyoxyethylene and polyoxypropylene initiated with trimethylolpropane and containing 99 moles of propylene oxide and 24 moles of ethylene oxide per mole of trimethylolpropane.
5 Suitable for use as LFNI in the AIaD compositions are those LFN1 having relatively low cloud points and high hydrophilic-Iipophilic balance (HLB).
Cloud points of 1 % solutions in water are typically below about 32oC and preferably lower, e.g., OoC, for optimum control of sudsing throughout a full range of water temperatures.
LFNIs which may also be used include a Clg alcohol polyethoxylate, having a degree of ethoxylation of about 8, commercially available as SLF18 from Olin Corp., and any biodegradable LFNI having the melting point properties discussed hereinabove.
(,bl. Anionic Co-surfactant - The automatic dishwashing detergent compositions 1 S herein are preferably substantially free from anionic co-surfactants. It has been discovered that certain anionic co-surfactants, particularly fatty carboxylic acids, can cause unsightly ftlms on dishware. Moreover, many anionic surfactants are high foaming. If present, the anionic co-surfactant is typically of a type having good solubility in the presence of calcium. Such anionic co-surfactants are further 20 illustrated by sulfobetaines, alkyl(polyethoxy)suifates (AES), alkyl (polyethoxy)carboxylates, and short chained C6-Clp alkyl sulfates and sulfonates.
2. Detersive Enzymes "Detersive enzyme", as used herein, means any enzyme having a cleaning, stain removing or otherwise beneficial effect in an ADD composition. Preferred 25 detersive enzymes are hydrolases such as proteases, amylases and lipases.
Highly preferred for automatic dishwashing are amylases and/or proteases, including both current commercially available types and improved types which, though more bleach compatible, have a remaining degree of bleach deactivation susceptibility.
In general, as noted, preferred ADD compositions herein comprise one or 30 more detersive enzymes. If only one enzyme is used, it is preferably an amyolytic enzyme when the composition is for automatic dishwashing use. Highly preferred for automatic dishwashing is a mixture of proteolytic enzymes and amyloytic enzymes. More generally, the enzymes to be incorporated include proteases, amylases, lipases, cellulases, and peroxidases, as well as mixtures thereof.
Other types of enzymes may also be included. They may be of any suitable origin;
such as vegetable, animal, bacterial, fungal and yeast origin. However, their choice is governed by several factors such as pH-activity and/or stability optima, thermostability, stability versus active detergents, builders, etc. In this respect 5 bacterial or fungal enzymes are preferred, such as bacterial amylases and proteases, and fungal cellulases.
Enzymes are normally incorporated in the instant detergent compositions at levels sufficient to provide a "cleaning-effective amount". The term "cleaning-effective amount" refers to any amount capable of producing a cleaning, stain 10 removal or soil removal effect on substrates such as fabrics, dishware and the like.
Since enzymes are catalytic materials; such amounts may be very small. In practical terms for current commercial preparations, typical amounts are up to about 5 mg by weight, more typically about 0.01 mg to about 3 mg, of active enzyme per gram ol~
the composition. Stated otherwise, the compositions herein will typically comprise 15 from about 0.001 % to about 6%, preferably 0.01 %-1 % by weight of a commercial enzyme preparation. Protease enzymes are usually present in such commercial preparations at levels sufficient to provide from 0.005 to 0.1 Anson units (AU) of activity per gram of composition. For automatic dishwashing purposes, it may be desirable to increase the active enzyme content of the commercial preparations, in 20 order to minimize the total amount of non-catalytically active materials delivered and thereby improve spotting/filming results.
Suitable examples of proteases are the subtilisins which are obtained from particular strains of B. subtilis and B. licheniformis. Another suitable protease is obtained from a strain of Bacillus, having maximum activity throughout the pH
range of 8-12, developed and sold by Novo Industries AIS as ESPER~~SE~. The preparation of this enzyme and analogous enzymes is described in British Patent Specification No. 1,243,784 of Novo. Proteolytic enzymes suitable for removing protein-based stains that are commercially available include those sold under the tradenames ALCALASE~ and SAVINASE~ by Novo Industries A/S (Denmark) and MAXATASE~ by International Bio-Synthetics, Inc. (The Netherlands). Other proteases include Protease A (see European Patent Application 130,756, published January 9, 1985) and Protease B (see European Patent Application Serial No.
87303761.8, filed April 28, 1987, and European Patent Application 130,756, Bott et al, published January 9, 1985) An especially preferred protease, referred to as "Protease D" is a carbonyl hydroiase variant having an amino acid sequence 'not found in nature, which is derived from a precursor carbonyl hydrolase by substituting a different amino acid for a plurality of amino acid residues. at a position in said carbonyl hydrolase S equivalent to position +76, preferably also in combination with one or more amino acid residue positions equivalent to those selected from the group consisting of +99, +101, +103, +104, +107, +123, +27, +105, +109, +126, +I28, +135, +156, +166, +195, +197, +204, +206, +210, +216, +217, +218, +222, +260, +265, and/or +274 according to the numbering of Bacillus amyloliquefacierrS subtilisin, as described in 10 the patent applications of A. Baeck, et al, entitled "Protease-Containing Cleaning Compositions" having U.S. Serial No. 081322,676, and C. Ghosh, et al, "Bleaching Compositions Comprising Protease Enzymes" having U.S. Serial No. 08/322.,677, both filed October 13, 1994.
Amylases suitable herein include, for example, a-amylases described in 15 British Patent Specification No. 1,296,839 (Novo). RAPIDASE~, International Bio Synthetics, Inc. and TERMAMYL~, Novo Industries.
Engineering of enzymes (e.g., stability-enhanced amylase) for improved stability, e.g., oxidative stability is known. See, for example J.Biological Chem., Vol. 260, No. 1I, June 1985, pp 6518-6521. "Reference amylase" refers to a 20 conventional amylase inside the scope of the amylase component of this invention.
Further, stability-enhanced amylases, also within the invention, are typically compared to these "reference amylases".
The present invention, in certain preferred embodiments, can makes use of amylases having improved stability in detergents, especially improved oxidative 25 stability. A convenient absolute stability reference-point against which amylases used in these preferred embodiments of the instant invention represent a measurable improvement is the stability of TERMAMYL~ in commercial use in 1993 and available from Novo Nordisk A/S. This TERMAMYL~ amylase is a "reference amylase", and is itself well-suited for use in the ADD (Automatic Dishwashing 30 Detergent) compositions of the invention. Even more preferred amylases herein share the characteristic of being "stability-enhanced" amylases, characterized, at a minimum, by a measurable improvement in one or more of: oxidative stability, e.g., to hydrogen peroxideltetraacetylethylenediamine in buffered solution at pH 9-10;
thermal stability, e.g., at common wash temperatures such as about 60oC; or alkaline stability, e.g., at a pH from about 8 to about 11, all measured versus the above-identified reference-amylase. Preferred amylases herein can demonstrate further improvement versus more challenging reference amylases, the latter reference amylases being illustrated by any of the precursor amylases of which preferred S amylases within the invention are variants. Such precursor amylases may themselves be natural or be the product of genetic engineering. Stability can be measured using any of the art-disclosed technical tests. See references disclosed in WO 94102597, itself and documents therein referred to being incorporated by reference.
In general, stability-enhanced amylases respecting the preferred embodiments of the invention can be obtained from Novo Nordisk A/S, or from Genencor International.
Preferred amylases herein have the commonality of being derived using site directed mutagenesis from one or more of the ~ Baccillus amylases, especialy the Bacillus alpha-amylases, regardless of whether one, two or multiple amylase strains are the immediate precursors.
As noted, "oxidative stability-enhanced" amylases are preferred for use herein despite the fact that the invention makes them "optional but preferred"
materials rather than essential. Such amylases are non-limitingly illustrated by the following:
(a) An amylase according to the hereinbefore incorporated WO/94/02597, Novo Nordisk A/S, published Feb. 3, 1994, as further illustrated by a mutant in which substitution is made, using alanine or threonine (preferably threonine), of the methionine residue located in position 197 of the B.licheniformis alpha-amylase, known as TERMAMYL~, or the homologous position variation of a similar parent amylase, such as B. amyloliquefaciens. B.subtilis, or B.stearothermophilas;
(b) Stability-enhanced amylases as described by Genencor International in a paper entitled "Oxidatively Resistant alpha-Amylases" presented at the 207th American Chemical Society National Meeting, March 13-17 1994, by C.
Mitchinson. Therein it was noted that bleaches in automatic dishwashing detergents inactivate alpha-amylases but that improved oxidative stability amylases have been made by Genencor from B.licheniformis NCIB8061. Methionine (Met) was identified as the most likely residue to be modified. Met was substituted, one at a time, in positions 8,15,197,256,304,366 and 438 leading to specific mutants, particularly important being M197L and M197T with the M197T variant being the most stable expressed variant. Stability was measured in CASCADE~ and SUNLIGI-IT~;
(c) Particularly preferred herein are amylase variants having additional modification in the immediate parent available. from Novo Nordisk A/S. These amylases do riot yet have a tradename but are those .referred to by the supplier as QL3 7+M 197T.
Any other oxidative stability-enhanced amylase can be used, for example as derived by site-directed mutagenesis from known chimeric, hybrid or simple mutant parent forms of available amylases.
Cellulases usable in> but not preferred, for the present invention include both bacterial or fungal cellulases. Typically, they will have a pH optimum of between 5 and 9.5. Suitable cellulases are disclosed in U.S. Patent 4,435,307.
Barbesgoard et al, issued March 6, 1984, which discloses fungal cellulase produced from Humicola insolens and Humicola strain DSM1800 or a cellulase 2I2-producing fungus belonging to the genus Aeromonas, and cellulase extracted from the hepatopancreas of a marine mollusk (Dolabella Auricula Solander). Suitable cellulases are also disclosed in GB-A-2.075.028; GB-A-2.095.275 and DE-OS-2.247.832.
CAREZYME~ (Novo) is especially useful.
Suitable lipase enzymes for detergent use include those produced by microorganisms of the Pseudomonas group, such as Pseudomonas stutzeri ATCC
I9.154, as disclosed in British Patent 1,372,034. See also lipases in Japanese Patent Application 53,20487, laid open to public inspection on February 24, 1978.
This lipase is available from Amano Pharmaceutical Co. Ltd., Nagoya, Japan, under the trade name Lipase P "Amano," hereinafter referred to as "Amano-P." Other commercial lipases include Amano-CES, iipases ex Chromobacter viscosum, e.g.
Chromobacter viscosum var. lipolyticum NRRLB 3673, commercially available from Toyo Jozo Co., Tagata, Japan; and further Chromobac~er viscosum lipases from U.S. Biochemical Corp., U.S.A. and Disoynth Co., The Netherlands, and lipases ex Pseudomonas gladioli. The LIPOLASE~ enzyme derived from Humicola lanuginosa and commercially available from Novo (see also EPO
341,947) is a preferred lipase for use herein. Another preferred lipase enzyme is the D96L variant of the native Humicola lanuginosa lipase, as described in WO
92/05249 and Research Disclosure No. 35944, March 10, 1994, both published by Novo. In general, lipolytic enzymes are less preferred than amylases andlor proteases for automatic dishwashing embodiments of the present invention.
Peroxidase enzymes can be used in combination with oxygen sources, e.g., percarbonate, perborate, persulfate, hydrogen peroxide, etc. They are typically used for "solution bleaching," i.e. to prevent transfer of dyes or pigments removed from substrates during wash operations to other substrates in the wash solution.
Peroxidase enzymes are known in the art, and include, for example, horseradish peroxidase, ligninase, and haloperoxidase such as chloro- and bromo-peroxidase.
Peroxidase-containing detergent compositions are disclosed, for example, in PCT
International Application WO 891099813, published October 19, 1989, by O.
Kirk:
assigned to Novo Industries A/S. The present invention encompasses peroxidase-free automatic dishwashing composition embodiments.
A wide range of enzyme materials and means for their incorporation into synthetic detergent compositions are also disclosed in U.S. Patent 3,553,139, issued January 5, 1971 to McCarty et al. Enzymes are further disclosed in U.S. Patent 4,101,457, Place et al, issued July 18, 1978, and in U.S. Patent 4,507,219, Hughes, issued March 26, 1985. Enzymes for use in detergents can be stabilized by various techniques. Enzyme stabilization techniques are disclosed and exemplified in U.S:
Patent 3,600,319, issued August 17, 1971 to Gedge, et al, and European Patent Application Publication No. 0 199 405, Application No. 86200586.x, published October 29, 1986, Venegas. Enzyme stabilization systems are also described, for example, in U.S. Patent 3,519,570.
Via) Enzyme Stabilizing System - The enzyme-containing compositions, especially liquid compositions, herein may comprise from about 0.001% to about 10%, preferably from about 0.005% to about 8%, most preferably from about 0.01 % to about 6%, by weight of an enzyme stabilizing system. The enzyme stabilizing system can be any stabilizing system which is compatible with ttue detersive enzyme. Such stabilizing systems can comprise calcium ion, boric acid, propylene glycol, short chain carboxylic acid, boronic acid, and mixtures thereof.
The stabilizing system of the ADDS herein may further comprise from 0 to about 10%, preferably from about 0.01 % to about 6% by weight, of chlorine bleach scavengers, added to prevent chlorine bleach species present in many water supplies from attacking and inactivating the enzymes, especially under alkaline conditions.
While chlorine levels in water may be small, typically in the range from about 0.5 ppm to about 1.75 ppm, the available chlorine in the total volume of water that comes in contact with the enzyme during dishwashing is relatively large;
accordingly, enzyme stability in-use can be probleri~atic, Suitable chlorine scavenger anions are widely known and readily available>
5 and are illustrated by salts containing ammonium cations with sulfite, bisulfate, thiosulfite> thiosulfate, iodide, etc. Antioxidants such as carbamate, ascorbate, etc., organic amines such as ethylenediamineteiracetic acid (EDTA) or alkali metal salt thereof, monoethanolamine (MEA); and mixtures thereof can likewise be used.
Other conventional scavengers such as bisulfate, nitrate, chloride, sources of 10 hydrogen peroxide such as sodium perborate tetrahydrate, sodium perborate monohydrate and sodium percarbonate, as well as phosphate, condensed phosphate, acetate, benzoate, citrate, formate, lactate, malate, tartrate, salicylate, etc., and mixtures thereof can be used if desired. In general, since the chlorine scavenger function can be performed by several of the ingredients separately listed under better 15 recognized functions, (e.g., other components of the invention such as sodium perborate), there is no requirement to add a separate chlorine scavenger unless a compound performing that function to the desired extent is absent from an enzyme-containing embodiment of the invention; even then, the scavenger is added only for optimum results. Moreover, the formulator will exercise a chemist's normal skill in 20 avoiding the use of any scavenger which is majorly incompatible with other ingredients, if used. In relation to the use of ammonium salts, such salts can be simply admixed with the detergent composition but are prone to adsorb water andlor liberate ammonia during storage. Accordingly, such materials, if present, are desirably protected in a particle such as that described in U.S. Patent 4,652,392, 25 Baginski et al.
3. Optional Bleach Adiuncts Via) Bleach Activators -Preferably, the peroxygen bleach component in the composition is formulated with an activator (peracid precursor). The activator is present at levels of from about 0:01 % to about 15%, preferably from about 1 % to about 1 U%, more preferably from about 1% to about 8%, by weight of the composition. Preferred activators are selected from the group consisting of tetraacetyl ethylene diamine (TAED), benzoylcaprolactam (BzCL), 4-nitrobenzoylcaprolactam, 3-chlorobenzoyl-caprolactam, benzoyloxybenzenesulphonate (BOBS), nonanoyloxybenzene-suiphonate (HOBS), phenyl benzoate (PhBz), decanoyloxybenzenesulphonate (C10' OBS),' benzoylvalerolactam (BZVL), octanoyloxybenzenesulphonate (Cg-OBS), perhydrolyzable esters and mixtures thereof, most preferably benzoylcaprolactam and benzoylvalerolactam. Particularly preferred bleach activators in the pH
range from about 8 to about 9.5 are those selected having an OBS or VL leaving group.
Preferred bleach activators are those described in U.S. Patent 5,130.045, Mitchell et al, and 4,412,934; Chung et al, and copending patent applications U. S.
Serial Nos. 08/064,624, 08/064,623, 08/064,621, 08/064,562, 08/064,564, 08/082,270 and copending application to M. Burns, A. D. Willey, R. T.
Hartshorn, C. K. Ghosh, entitled "Bleaching Compounds Comprising Peroxyacid Activators Used With Enzymes" and having U.S. Serial No. 08/133.691 (P&G Case 4890R), all of which are incorporated herein by reference.
The mole ratio of peroxygen bleaching compound (as Av0) to bleach activator in the present invention generally ranges from at least 1:1, preferably from about 20:1 to about 1:1, more preferably from about 10:1 to about 3:1.
Quaternary substituted bleach activators may also be included. The present detergent compositions preferably comprise a quaternary substituted bleach activator (QSBA) or a quaternary substituted peracid (QSP); more preferably, the former:
Preferred QSBA structures are further described in copending U.S. Serial No.
08/298,903, 08/298,650, 081298,906 and 081298,904 filed August 31, 1994, incorporated herein by reference.
(b) Organic Peroxides especially Diacvl Peroxides - These are extensively illustrated in Kirk Othmer, Encyclopedia of Chemical Technology, Vol. 17, John Wiley and Sons, 1982 at pages 27-90 and especially at pages 63-72, all incorporated herein by reference. If a diacyl peroxide is used, it will preferably be one which exerts minimal adverse impact on spotting/filming.
4. nH and Bufferine Variation Many detergent compositions herein will be buffered, i.e., they are relatively resistant to pH drop in the presence of acidic soils. However, other compositions herein may have exceptionally low buffering capacity, or may be substantially unbuffered. Techniques for controlling or varying pH at recommended Usage levels more generally include the use of not only buffers, but also additional alkalis, acids, pH jump systems, dual compartment containers, etc., and are well known to those skilled in the art.
The preferred ADD compositions herein comprise a pH-adjusting component selected from water-soluble alkaline inorganic salts and water-soluble organic or inorganic builders. The pH-adjusting components are selected so that when the ADD is dissolved in water at a concentration of 1,000 - 5,000 ppm, the pH
remains in the range of above about 8, preferably frorp about 9.5 to about 1 I . The preferred nonphosphate pH-adjusting component of the invention is selected from the group consisting of:
(i) sodium carbonate or sesquicarbonate;
(ii) sodium silicate, preferably hydrous sodium silicate having Si02:Na20 ratio I O of from about 1:1 to about 2:1, and mixtures thereof with limited quantites of sodium metasilicate;
(iii) sodium citrate;
(iv) citric acid;
(v) sodium bicarbonate;
I S (vi) sodium borate, preferably borax;
(vii) sodium hydroxide; and (viii) mixtures of (i~(vii).
Preferred embodiments contain low levels of silicate (i.e. from about 3% to about 10% Si02).
20 Illustrative of highly preferred pH-adjusting component systems are binary mixtures of granular sodium citrate with anhydrous sodium carbonate, and three-component mixtures of granular sodium citrate trihydrate, citric acid monohydrate and anhydrous sodium carbonate.
The amount of the pH adjusting component in the instant ADD compositions 25 is preferably from about 1% to about 50%, by weight of the composition. In a preferred embodiment, the pH-adjusting component is present in the ADD
composition in an amount from about 5% to about 40%, preferably from about 10%
to about 30%, by weight.
For compositions herein having a pH between about 9.5 and about 11 of the 30 initial wash solution, particularly preferred ADD embodiments comprise, by weight of ADD, from about 5% to about 40%, preferably from about 10% to about 30%, most preferably from about 15% to about 20%, of sodium citrate with from about 5% to about 30%, preferably from about 7% to 25%, most preferably from about
8%
to about 20% sodium carbonate.
The essential pH-adjusting system can be complemented (i.e. for improved sequestration in hard watery by other optional detergency builder salts selected from nonphosphate detergency builders known in the art, which include the various water-soluble, alkali metal, ammonium or substituted ammonium borates.
S hydroxysulfonates, polyacetates, and polycarboxylates. Preferred are the alkali metal, especially sodium, salts of such materials. Alternate water-soluble, non-phosphorus organic builders can be used for their sequestering properties.
Examples of polyacetate and polycarboxylate builders are the sodium, potassium, lithium, ammonium and substituted ammonium salts of ethylenediamine tetraacetic acid;
nitrilotriacetic acid, tartrate monosuccinic acid, tartrate disuceinic acid, oxydisuccinic acid, carboxymethoxysuccinic acid, mellitic acid, and sodium benzene polycarboxylate salts.
(a) Water-Soluble Silicates The present automatic dishwashing detergent compositions may further comprise water-soluble silicates. Water-soluble silicates herein are any silicates which are soluble to the extent that they do not adveresely affect spotting/filming characteristics of the ADD composition.
Examples of silicates are sodium metasilicate and, more generally, the alkali metal silicates, particularly those having a Si02:Na20 ratio in the range 1.6:1 to 3.2:1; and layered silicates, such as the layered sodium silicates described in U.S.
Patent 4,664,839, issued May I2, 1987 to H. P. Rieck. NaSKS-6~ is a crystalline layered silicate marketed by Hoechst (commonly abbreviated herein as "SKS-6").
Unlike zeolite builders, Na SKS-6 and other water-solubie silicates usefule herein do not contain aluminum. NaSKS-6 is the b-Na2Si0~ form of layered silicate and can be prepared by methods such as those described in German DE-A-3,17,649 and DE-A-3_,742,043. SKS-6 is a preferred layered silicate for use herein, but other such layered silicates, such as those having the general formula NaMSixC~2xfl'yH20 wherein M is sodium or hydrogen, x is a number from 1.9 to 4, preferably 2, and y is a number from 0 to 20, preferably 0 can be used. Various other layered silicates from Hoechst include NaSKS-5, NaSKS-7 and NaSKS-11, as the a-, (3- and y-forms. Other silicates may also be useful, such as for example magnesium silicate.
which can serve as a crispening agent in granular formulations, as a stabilizing agent for oxygen bleaches, and as a component of suds control systems.
Silicates particularly useful in automatic dishwashing (ADD) applications include granular hydrous 2-ratio silicates such as BRITESIL~ H20 from PQ
Corp., and the commonly sourced BRITESIL~ H24 though liquid grades of various silicates can be used when the ADD composition has liquid form. Within safe S limits, sodium metasilicate or sodium hydroxide alone or in combination with other silicates may be used in an ADD context to boost wash pH to a desired level.
5. Builders - Detergent builders other than silicates can optionally be included in the compositions herein to assist in controlling mineral hardness.
Inorganic as well as organic builders can be used. Builders are typically used in automatic IO dishwashing and fabric laundering compositions, for example to assist in the removal of particulate soils.
The level of builder can vary widely depending upon the end use of the composition and its desired physical form. When present, the compositions will typically comprise at least about I % builder. High performance compositions 1 ~ typically comprise from about 10% to about 80%, more typically from about 15% to about 50% by weight, of the detergent builder. Lower or higher levels of builder, however, are not excluded.
Inorganic or non-phosphate P-containing detergent builders include, but are not limited to, phosphonates, phytic acid, silicates, carbonates (including 20 bicarbonates and sesquicarbonates), sulfates, citrate, zeolite or layered silicate, and aluminosilicates. See U.S. Pat. 4,605,509 for examples of preferred aluminosilicates.
Examples of carbonate builders are the alkaline earth and alkali metal carbonates as disclosed in German Patent Application No. 2,321,001 published on 25 November 15, 1973. Various grades and types of sodium carbonate and sodium sesquicarbonate may be used, certain of which are particularly useful as carriers for other ingredients, especially detersive surfactants.
Aluminosilicate builders may be used in the present compositions though are not preferred for automatic dishwashing detergents. Aluminosilicate builders are of 30 great importance in most currently marketed heavy duty granular detergent compositions, and can also be a significant builder ingredient in liquid detergent formulations. Aluminosilicate builders include those having the empirical formula:
Na20~A1~U3 ~xSiOi yH20 wherein z and y are integers of at least 6, the molar ratio of z to y is in the range from 1.0 to about 0.5, and x is an integer from about 15 to about 264.
Useful aluminosilicate ion exchange materials are commercially available.
These aluminosilicates can be crystalline or amorphous in structure and can b~:
5 naturally-occurring aluminosilicates or synthetically derived. A method for producing aluminosilicate ion exchange materials is disclosed in U.S. Patent 3,985,669, Krurnmel, et al, issued October 12, 1976. Preferred synthetic crystalline aluminosilicate ion exchange materials useful herein are available under the designations Zeolite A, Zeolite P (B), Zeolite MAP and Zeolite X. In another 10 embodiment, the crystalline aluminosilicate ion exchange material has the formula:
Nal2[(A102)12(Si02)12]'xH~O wherein x is from about 20 to about 30, especiall~~
about 27. This material is known as Zeolite A. Dehydrated zeolites (x = 0 -10'1 may also be used herein. Preferably, the aluminosilicate has a particle size of about 0.1-10 microns in diameter. Individual particles, can desirably be even smaller than 15 0.1 micron to further assist kinetics of exchange through maximization of surface:
area. High surface area also increases utility of aluminosilicates as adsorbents for surfactants, especially in granular compositions. Aggregates of silicate or aluminosilicate particles may be useful, a single aggregate having dimensions tailored to minimize segregation in granular compositions, while the aggregate 20 particle remains dispersible to submicron individual particles during the wash. As with other builders such as carbonates, it may be desirable to use zeolites in any physical or morphological form adapted to promote surfactant carrier :function, and appropriate particle sizes may be freely selected by the formulator.
Organic detergent builders suitable for the purposes of the present invention 25 include, but are not restricted to, a wide variety of polycarboxylate compounds. As.
used herein, "poIycarboxylate" refers to compounds having a plurality of carboxylate groups, preferably at least 3 carboxylates. Polycarboxylat~
builder can generally be added to the composition in acid form, but can also be added in the form of a neutralized salt or "overbased". When utilized in salt form, alkali metals, 30 such as sodium, potassium, and lithium, or alkanolammonium salts are preferred.
Included among the polycarboxylate builders are a variety of categories of useful materials. One important category of polycarboxylate builders encompasses the ether polycarboxylates, including pxydisuccinate, as disclosed in Berg, U.S.
Patent 3,128,287, issued April 7, 1964, and Lamberti et al, U.S. Patent 3;635,830, issued January 18, 1972. See also "TMSlTDS" builders of U.S. Patent 4,663,071.
issued to Bush et al, on May 5. 1987. Suitable ether polycarboxylates also include cyclic compounds, particularly alicyclic compounds; such as those described in U.S.
Patents 3,923,679; 3,835,163; 4,158,635;.4,120,874 and 4,102,903.
Other useful detergency builders include the ether hydroxypolycarboxylates, copolymers of malefic anhydride with ethylene or vinyl methyl ether, l, 3, 5-trihydroxy benzene-2, 4, 6-trisulphonic acid, and carboxymethyloxysuccinic acid, the various alkali metal, ammonium and substituted ammonium salts of polyacetic acids such as ethylenediaminetetraacetic acid ,and nitrilotriacetic acid, as well as 10 polycarboxylates such as mellitic acid, succinic acid, oxydisuccinic acid, polymaleic acid, benzene 1,3,5-tricarboxylic acid, carboxymethyloxysuccinic acid, and soluble salts thereof.
Citrate builders, e.g., citric acid and soluble salts thereof (particularly sodium salt),, are polycarboxylate builders of particular importance for heavy duty laundry 15 detergent and automatic dishwashing formulations due to their availability from renewable resources and their biodegradability. Citrates can also be used in combination with zeolite, the aforementioned BRITESIL types, and/or layered silicate builders. Oxydisuccinates are also useful in such compositions and combinations.
20 AIso suitable in the detergent compositions of the present invention are the 3,3-dicarboxy-4-oxa-1,6-hexanedionates and the related compounds disclosed in U.S. Patent 4,566,984, Bush, issued January 28, 1986. Useful succinic acid builders include the CS-C2p alkyl and alkenyl succinic acids and salts thereof. A
particularly preferred compound of this type is dodecenylsuccinic acid. Specific examples of 25 succinate builders include: laurylsuccinate, myristylsuccinate, palmitylsuccinate, 2-dodecenylsuccinate (preferred), 2-pentadecenylsuccinate, and the like.
Laurylsuccinates are the preferred builders of this group, and are described in European Patent Application 86200690.5/0,200,263, published November 5, 1986.
Other suitable polycarboxylates are disclosed in U.S. Patent 4,144,226, 30 Crutchfield et al, issued March 13, 1979 and in U.S. Patent 3,308,067, Diehl, issued March 7, 1967. See also U.S. Patent 3,723,322.
Fatty acids, e.g., C 12-C 1 g monocarboxylic acids, may also be incorporated into the compositions alone, or in combination with the aforesaid builders, especially citrate and/or the succinate builders, to provide additional builder activity but are generally not desired. Such use of fatty acids will generally result in a diminution of sudsing in laundry compositions, which may need to be be taken into account by the formulator. Fatty acids or their salts are undesirable in Automatic Dishwashing (ADD) embodiments in situations wherein soap scums can form and S be deposited on dishware.
Where phosphorus-based builders can be used, the various alkali metal phosphates such as the well-known sodium tripolyphosphates, sodium pyrophosphate and sodium orthophosphate can be used. Phosphonate builders such as ethane-I-hydroxy-1,1-diphosphonate and other known phosphonates (see, for example, U.S. Patents 3,159,581; 3,213,030; 3,422,021; 3,400,148 and 3,422,137) can also be used though such materials are more commonly used in a low-level mode as chelants or stabilizers.
6. Chelatina Agents The compositions herein may also optionally contain one or more transition I5 metal selective sequestrants, "chelants" or "chelating agents", e.g., iron and/or copper and/or manganese chelating agents. Chelating agents suitable for use herein can be selected from the group consisting of aminocarboxylates, phosphonates (especially the aminophosphonates), polyfunctionally-substituted aromatic chelating agents, and mixtures thereof. Without intending to be bound by theory, it is believed that the benefit of these materials is due in part to their exceptional ability to control iron, copper and manganese in washing solutions which are known to decompose hydrogen peroxide and/or bleach activators; other benefits include inorganic film prevention or scale inhibition. Commercial chelating agents for use herein include the DEQUEST~ series, and chelants from Monsanto, l~uPont; and Nalco, Inc.
Aminocarboxylates useful as optional chelating agents are further illustrated by ethylenediaminetetracetates, N hydroxyethylethylenediaminetriacetates, nitrilo-triacetates, ethylenediamine tetraproprionates, triethylenetetraaminehexacetates, diethylenetriamine-pentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts thereof. In general, chelant mixtures may be used for a combination of functions, such as multiple transition-metal control, long-term product stabilization, and/or control of precipitated transition metal oxides andlor hydroxides.
Polyfunctionally-substituted aromatic chelating agents are also useful in the compositions herein. See U.S. Patent 3,812,044, issued May 21, 1974, to Connor et al. Preferred compounds of this type in acid form are dihydroxydisulfobenzenes such as 1,2-dihydroxy-3,5-disulfobenzene.
5 A highly preferred biodegradable ch~lator, for use herein is ethylenediamine disuccinate {"EDDS"), especially (but not limited to) the [S,S] isomer as described in U.S. Patent 4,704,233, November 3, 1987, to Hartman and Perkins. The trisodium salt is preferred though other forms, such as magnesium salts, may also be useful.
10 Aminophosphonates are also suitable for use as chelating agents in the compositions of the invention when at least low levels of total phosphorus are acceptable in detergent compositions, and include the ethylenediaminetetrakis (methylenephosphonates) and the diethylenetriaminepentakis (methylene phosphonates). Preferably, these aminophosphonates do not contain alkyl or alkenyl 15 groups with more than about 6 carbon atoms.
If utilized, chelating agents or transition-metal-selective sequestrants will preferably comprise from about 0.001% to about 10%, more preferably from about 0.05% to about 1 % by weight of the compositions herein.
7. Dispersant Polymer - Preferred ADD compositions herein may additionally 20 contain a dispersant polymer. When present, a dispersant polymer in the instant ADD compositions is typically at levels in the range from 0 to about 25%, preferably from about 0.5% to about 20%, more preferably from about I% to about 8% by weight of the ADD composition. Dispersant polymers are useful for improved filming performance of the present ADD compositions, especially in 25 higher pH embodiments, such as those in which wash pH exceeds about 9.5.
Particularly preferred are polymers which inhibit the deposition of calcium carbonate or magnesium silicate on dishware.
Dispersant polymers suitable for use herein are further illustrated by the film forming polymers described in U.S. Pat. No. 4,379,080 (Murphy), issued Apr. 5, 30 1983.
Suitable polymers are preferably at least partially neutralized or alkali metal, ammonium or substituted ammonium (e.g., mono-, di- or triethanolammonium) salts of polycarboxylic acids. The alkali metal, especially sodium salts are most preferred. While the molecular weight of the polymer can vary over a wide range, it preferably is from about 1,000 to about 500,000, more preferably is from about 1,000 to about 20,000, and most preferably, especially if the ADD is for use in North American automatic dishwashing appliances, is from about 1,000 to about 5,000.
Other suitable dispersant polymers include those disclosed in U.S. Patent No.
3.308,067 issued March 7, 1967, to Diehl. Unsaturated monomeric acids that can be polymerized to form suitable dispersant polymers include acrylic acid, malefic acid (or malefic anhydride), fumaric acid, itaconic acid, aconitic acid, mesaconic acid, citraconic acid and methylenemalonic acid. The presence of monomeric segments containing no carboxylate radicals such as methyl vinyl ether, styrene, ethylene, etc.
is suitable provided that such segments do not constitute more than about 50%
by weight of the dispersant polymer.
Copolymers of acrylarnide and acrylate having a molecular weight of from about 3,000 to about 100,000, preferably from a)~out 4,000 to about 20,000, and an acrylamide content of less than about 50%, preferably less than about 20%, by weight of the dispersant polymer can also be used. Most preferably, such dispersant polymer has a molecular weight of from about 4,000 to about 20,()00 and an acrylamide content of from about 0% fo about 15%, by weight of the polymer.
Particularly preferred dispersant polymers are low molecular weight modified polyacrylate copolymers. Such copolymers contain as monomer units: a) from about 90% to about 10%, preferably from about 80% to about 20% by weight acrylic acid or its salts and b) from about 10% to about 90%, preferably from about 20% to about 80% by weight of a substituted acrylic monomer or its salt and have the general formula: -[(C(R2)C(R1){C(O)ORS)] wherein the apparently unfilled valencies are in fact occupied by hydrogen and at least one of the substituents Rl, R2, or RS, preferably R1 or R2, is a 1 to 4 carbon alkyl or hydroxyalkyl group; R1 or R2 can be a hydrogen and RS can be a hydrogen or alkali metal salt. Most preferred is a substituted acrylic monomer wherein R1 is methyl, R2 is hydrogen, and R3 is sodium.
Suitable low molecular weight polyacrylate dispersant polymer preferably has a molecular weight of less than about 15,000, preferably from about 500 to about 10,000, most preferably from about 1,000 to about 5,000. The most preferred polyacrylate copolymer for use herein has a molecular weight of about 3,500 and is the fully neutralized form of the polymer comprising about 70% by weight acrylic acid and about 30% by weight methacrylic acid.
Other suitable modified polyacrylate copolymers include the low molecular weight copolymers of unsaturated aliphatic carboxylic acids disclosed in U.S.
5 Patents 4,530,766, and 5,084,535.
Agglomerated forms of the present ADD compositions may employ aqueous solutions of polymer dispersants as liquid binders for making the agglomerate (particularly when the composition consists of a mixture of sodium citrate and sodium carbonate). Especially preferred .are polyacrylates with an average 10 molecular weight of from about 1,000 to about 10,000, and acrylate/maleate or acrylate/fumarate copolymers with an average molecular weight of from about 2,000 to about 80,000 and a ratio of acrylate to maleate or fumarate segments of from about 30:1 to about 1:2. Examples of such copolymers based on a mixture of unsaturated mono- and dicarboxylate monomers are disclosed in European Patent 15 Application No. 66,915, published December 15, 1982.
Other dispersant polymers useful herein include the polyethylene glycols and polypropylene glycols having a molecular weight of from about 950 to about 30,000 which can be obtained from the Dow Chemical Company of Midland, Michigan.
Such compounds for example, having a melting point within the range of from about 20 30oC to about 100oC, can be obtained at molecular weights of 1,450, 3,400, 4,500, 6,000, 7,400, 9,500, and 20,000. Such compounds are formed by the polymerization of ethylene glycol or propylene glycol with the requisite number of moles of ethylene or propylene oxide to provide the desired molecular weight and melting point of the respective polyethylene glycol and polypropylene glycol. The 25 polyethylene, polypropylene and mixed glycols are referred to using the formula:
HO(CH2CH20)m(CH2CH(CI-I3)O)n(CH(CH3)CH20)oOH wherein m, n, and o are integers satisfying the molecular weight and temperature requirements given above.
Yet other dispersant polymers useful herein include the cellulose sulfate esters such as cellulose acetate sulfate, cellulose sulfate, hydroxyethyl cellulose sulfate, 30 methylceilulose sulfate, and hydroxypropylcellulose sulfate. Sodium cellulose sulfate is the most preferred polymer of this group.
Other suitable dispersant polymers are the carboxylated polysaccharides, particularly starches, celluloses and alginates, described in U.S. Pat. No.
3,723,322, Diehl, issued Mar. 27, 1973; the dextrin esters of polycarboxylic acids disclosed in U.S. Pat. No. 3,929,107, Thompson, issued Nov. 11, 1975; the hydroxyalkyl starch ethers.'starch esters, oxidized starches, dextrins and starch hydrolysates described in U.S. Pat No. 3,803,285, Jensen, issued Apr. 9, 1974; the carboxylated starches described in U.S. Pat. No. 3,629,121, Eldib, issued Dec. 21, 1971; and the dextrin starches described in U.S. Pat. No. 4,141,841, MeDonald, issued Feb. 27, 1979.
Preferred cellulose-derived dispersant polymers are the carboxymethyl celluloses.
Yet another group of acceptable dispersants are the organic dispersant polymers, such as polyaspartate.
8. Material Care Agents - The present ADD compositions may contain one or more material care agents which are effective as corrosion inhibitors and/or anti tarnish aids. Such materials are preferred components of machine dishwashing compositions especially in certain European countries where the use of electroplated nickel silver and sterling silver is still comparatively common in domestic flatware, or when aluminium protection is a concern and,the composition is low in silicate.
1 S Generally, such material care agents include metasilicate, silicate, bismuth salts, manganese salts, paraffin, triazoles, pyrazoles, thiols, mercaptans, aluminium fatty acid salts, and mixtures thereof.
When present, such protecting materials are preferably incorporated at low levels, e.g., from about 0.01% to about S% of the ADD composition. Suitable corrosion inhibitors include paraffin oil, typically a predominantly branched aliphatic hydrocarbon having a number of carbon atoms in the range of from about 20 to about 50; preferred paraffin oil is selected from predominantly branched 45 species with a ratio of cyclic to noncyclic hydrocarbons of about 32:68. A
paraffin oil meeting those characteristics is sold by Wintershall, Salzbergen, Germany, under the trade name WINOG 70. Additionally, the addition of low levels of bismuth nitrate (i.e., Bi(N03)3) is also preferred.
Other corrosion inhibitor compounds include benzotriazole and comparable compounds; mercaptans or thiols including thionaphtol and thioanthranol; and finely divided Aluminium fatty acid salts, such as aluminium tristearate. The formulator will recognize that such materials will generally be used judiciously and in limited quantities so as to avoid any tendency to produce spots or films on glassware or to compromise the bleaching action of the compositions. For this reason, mercaptan anti-tarnishes which are quite strongly bleach-reactive and common fatty carboxylic acids which precipitate with calcium in particular are preferably avoided.
to about 20% sodium carbonate.
The essential pH-adjusting system can be complemented (i.e. for improved sequestration in hard watery by other optional detergency builder salts selected from nonphosphate detergency builders known in the art, which include the various water-soluble, alkali metal, ammonium or substituted ammonium borates.
S hydroxysulfonates, polyacetates, and polycarboxylates. Preferred are the alkali metal, especially sodium, salts of such materials. Alternate water-soluble, non-phosphorus organic builders can be used for their sequestering properties.
Examples of polyacetate and polycarboxylate builders are the sodium, potassium, lithium, ammonium and substituted ammonium salts of ethylenediamine tetraacetic acid;
nitrilotriacetic acid, tartrate monosuccinic acid, tartrate disuceinic acid, oxydisuccinic acid, carboxymethoxysuccinic acid, mellitic acid, and sodium benzene polycarboxylate salts.
(a) Water-Soluble Silicates The present automatic dishwashing detergent compositions may further comprise water-soluble silicates. Water-soluble silicates herein are any silicates which are soluble to the extent that they do not adveresely affect spotting/filming characteristics of the ADD composition.
Examples of silicates are sodium metasilicate and, more generally, the alkali metal silicates, particularly those having a Si02:Na20 ratio in the range 1.6:1 to 3.2:1; and layered silicates, such as the layered sodium silicates described in U.S.
Patent 4,664,839, issued May I2, 1987 to H. P. Rieck. NaSKS-6~ is a crystalline layered silicate marketed by Hoechst (commonly abbreviated herein as "SKS-6").
Unlike zeolite builders, Na SKS-6 and other water-solubie silicates usefule herein do not contain aluminum. NaSKS-6 is the b-Na2Si0~ form of layered silicate and can be prepared by methods such as those described in German DE-A-3,17,649 and DE-A-3_,742,043. SKS-6 is a preferred layered silicate for use herein, but other such layered silicates, such as those having the general formula NaMSixC~2xfl'yH20 wherein M is sodium or hydrogen, x is a number from 1.9 to 4, preferably 2, and y is a number from 0 to 20, preferably 0 can be used. Various other layered silicates from Hoechst include NaSKS-5, NaSKS-7 and NaSKS-11, as the a-, (3- and y-forms. Other silicates may also be useful, such as for example magnesium silicate.
which can serve as a crispening agent in granular formulations, as a stabilizing agent for oxygen bleaches, and as a component of suds control systems.
Silicates particularly useful in automatic dishwashing (ADD) applications include granular hydrous 2-ratio silicates such as BRITESIL~ H20 from PQ
Corp., and the commonly sourced BRITESIL~ H24 though liquid grades of various silicates can be used when the ADD composition has liquid form. Within safe S limits, sodium metasilicate or sodium hydroxide alone or in combination with other silicates may be used in an ADD context to boost wash pH to a desired level.
5. Builders - Detergent builders other than silicates can optionally be included in the compositions herein to assist in controlling mineral hardness.
Inorganic as well as organic builders can be used. Builders are typically used in automatic IO dishwashing and fabric laundering compositions, for example to assist in the removal of particulate soils.
The level of builder can vary widely depending upon the end use of the composition and its desired physical form. When present, the compositions will typically comprise at least about I % builder. High performance compositions 1 ~ typically comprise from about 10% to about 80%, more typically from about 15% to about 50% by weight, of the detergent builder. Lower or higher levels of builder, however, are not excluded.
Inorganic or non-phosphate P-containing detergent builders include, but are not limited to, phosphonates, phytic acid, silicates, carbonates (including 20 bicarbonates and sesquicarbonates), sulfates, citrate, zeolite or layered silicate, and aluminosilicates. See U.S. Pat. 4,605,509 for examples of preferred aluminosilicates.
Examples of carbonate builders are the alkaline earth and alkali metal carbonates as disclosed in German Patent Application No. 2,321,001 published on 25 November 15, 1973. Various grades and types of sodium carbonate and sodium sesquicarbonate may be used, certain of which are particularly useful as carriers for other ingredients, especially detersive surfactants.
Aluminosilicate builders may be used in the present compositions though are not preferred for automatic dishwashing detergents. Aluminosilicate builders are of 30 great importance in most currently marketed heavy duty granular detergent compositions, and can also be a significant builder ingredient in liquid detergent formulations. Aluminosilicate builders include those having the empirical formula:
Na20~A1~U3 ~xSiOi yH20 wherein z and y are integers of at least 6, the molar ratio of z to y is in the range from 1.0 to about 0.5, and x is an integer from about 15 to about 264.
Useful aluminosilicate ion exchange materials are commercially available.
These aluminosilicates can be crystalline or amorphous in structure and can b~:
5 naturally-occurring aluminosilicates or synthetically derived. A method for producing aluminosilicate ion exchange materials is disclosed in U.S. Patent 3,985,669, Krurnmel, et al, issued October 12, 1976. Preferred synthetic crystalline aluminosilicate ion exchange materials useful herein are available under the designations Zeolite A, Zeolite P (B), Zeolite MAP and Zeolite X. In another 10 embodiment, the crystalline aluminosilicate ion exchange material has the formula:
Nal2[(A102)12(Si02)12]'xH~O wherein x is from about 20 to about 30, especiall~~
about 27. This material is known as Zeolite A. Dehydrated zeolites (x = 0 -10'1 may also be used herein. Preferably, the aluminosilicate has a particle size of about 0.1-10 microns in diameter. Individual particles, can desirably be even smaller than 15 0.1 micron to further assist kinetics of exchange through maximization of surface:
area. High surface area also increases utility of aluminosilicates as adsorbents for surfactants, especially in granular compositions. Aggregates of silicate or aluminosilicate particles may be useful, a single aggregate having dimensions tailored to minimize segregation in granular compositions, while the aggregate 20 particle remains dispersible to submicron individual particles during the wash. As with other builders such as carbonates, it may be desirable to use zeolites in any physical or morphological form adapted to promote surfactant carrier :function, and appropriate particle sizes may be freely selected by the formulator.
Organic detergent builders suitable for the purposes of the present invention 25 include, but are not restricted to, a wide variety of polycarboxylate compounds. As.
used herein, "poIycarboxylate" refers to compounds having a plurality of carboxylate groups, preferably at least 3 carboxylates. Polycarboxylat~
builder can generally be added to the composition in acid form, but can also be added in the form of a neutralized salt or "overbased". When utilized in salt form, alkali metals, 30 such as sodium, potassium, and lithium, or alkanolammonium salts are preferred.
Included among the polycarboxylate builders are a variety of categories of useful materials. One important category of polycarboxylate builders encompasses the ether polycarboxylates, including pxydisuccinate, as disclosed in Berg, U.S.
Patent 3,128,287, issued April 7, 1964, and Lamberti et al, U.S. Patent 3;635,830, issued January 18, 1972. See also "TMSlTDS" builders of U.S. Patent 4,663,071.
issued to Bush et al, on May 5. 1987. Suitable ether polycarboxylates also include cyclic compounds, particularly alicyclic compounds; such as those described in U.S.
Patents 3,923,679; 3,835,163; 4,158,635;.4,120,874 and 4,102,903.
Other useful detergency builders include the ether hydroxypolycarboxylates, copolymers of malefic anhydride with ethylene or vinyl methyl ether, l, 3, 5-trihydroxy benzene-2, 4, 6-trisulphonic acid, and carboxymethyloxysuccinic acid, the various alkali metal, ammonium and substituted ammonium salts of polyacetic acids such as ethylenediaminetetraacetic acid ,and nitrilotriacetic acid, as well as 10 polycarboxylates such as mellitic acid, succinic acid, oxydisuccinic acid, polymaleic acid, benzene 1,3,5-tricarboxylic acid, carboxymethyloxysuccinic acid, and soluble salts thereof.
Citrate builders, e.g., citric acid and soluble salts thereof (particularly sodium salt),, are polycarboxylate builders of particular importance for heavy duty laundry 15 detergent and automatic dishwashing formulations due to their availability from renewable resources and their biodegradability. Citrates can also be used in combination with zeolite, the aforementioned BRITESIL types, and/or layered silicate builders. Oxydisuccinates are also useful in such compositions and combinations.
20 AIso suitable in the detergent compositions of the present invention are the 3,3-dicarboxy-4-oxa-1,6-hexanedionates and the related compounds disclosed in U.S. Patent 4,566,984, Bush, issued January 28, 1986. Useful succinic acid builders include the CS-C2p alkyl and alkenyl succinic acids and salts thereof. A
particularly preferred compound of this type is dodecenylsuccinic acid. Specific examples of 25 succinate builders include: laurylsuccinate, myristylsuccinate, palmitylsuccinate, 2-dodecenylsuccinate (preferred), 2-pentadecenylsuccinate, and the like.
Laurylsuccinates are the preferred builders of this group, and are described in European Patent Application 86200690.5/0,200,263, published November 5, 1986.
Other suitable polycarboxylates are disclosed in U.S. Patent 4,144,226, 30 Crutchfield et al, issued March 13, 1979 and in U.S. Patent 3,308,067, Diehl, issued March 7, 1967. See also U.S. Patent 3,723,322.
Fatty acids, e.g., C 12-C 1 g monocarboxylic acids, may also be incorporated into the compositions alone, or in combination with the aforesaid builders, especially citrate and/or the succinate builders, to provide additional builder activity but are generally not desired. Such use of fatty acids will generally result in a diminution of sudsing in laundry compositions, which may need to be be taken into account by the formulator. Fatty acids or their salts are undesirable in Automatic Dishwashing (ADD) embodiments in situations wherein soap scums can form and S be deposited on dishware.
Where phosphorus-based builders can be used, the various alkali metal phosphates such as the well-known sodium tripolyphosphates, sodium pyrophosphate and sodium orthophosphate can be used. Phosphonate builders such as ethane-I-hydroxy-1,1-diphosphonate and other known phosphonates (see, for example, U.S. Patents 3,159,581; 3,213,030; 3,422,021; 3,400,148 and 3,422,137) can also be used though such materials are more commonly used in a low-level mode as chelants or stabilizers.
6. Chelatina Agents The compositions herein may also optionally contain one or more transition I5 metal selective sequestrants, "chelants" or "chelating agents", e.g., iron and/or copper and/or manganese chelating agents. Chelating agents suitable for use herein can be selected from the group consisting of aminocarboxylates, phosphonates (especially the aminophosphonates), polyfunctionally-substituted aromatic chelating agents, and mixtures thereof. Without intending to be bound by theory, it is believed that the benefit of these materials is due in part to their exceptional ability to control iron, copper and manganese in washing solutions which are known to decompose hydrogen peroxide and/or bleach activators; other benefits include inorganic film prevention or scale inhibition. Commercial chelating agents for use herein include the DEQUEST~ series, and chelants from Monsanto, l~uPont; and Nalco, Inc.
Aminocarboxylates useful as optional chelating agents are further illustrated by ethylenediaminetetracetates, N hydroxyethylethylenediaminetriacetates, nitrilo-triacetates, ethylenediamine tetraproprionates, triethylenetetraaminehexacetates, diethylenetriamine-pentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts thereof. In general, chelant mixtures may be used for a combination of functions, such as multiple transition-metal control, long-term product stabilization, and/or control of precipitated transition metal oxides andlor hydroxides.
Polyfunctionally-substituted aromatic chelating agents are also useful in the compositions herein. See U.S. Patent 3,812,044, issued May 21, 1974, to Connor et al. Preferred compounds of this type in acid form are dihydroxydisulfobenzenes such as 1,2-dihydroxy-3,5-disulfobenzene.
5 A highly preferred biodegradable ch~lator, for use herein is ethylenediamine disuccinate {"EDDS"), especially (but not limited to) the [S,S] isomer as described in U.S. Patent 4,704,233, November 3, 1987, to Hartman and Perkins. The trisodium salt is preferred though other forms, such as magnesium salts, may also be useful.
10 Aminophosphonates are also suitable for use as chelating agents in the compositions of the invention when at least low levels of total phosphorus are acceptable in detergent compositions, and include the ethylenediaminetetrakis (methylenephosphonates) and the diethylenetriaminepentakis (methylene phosphonates). Preferably, these aminophosphonates do not contain alkyl or alkenyl 15 groups with more than about 6 carbon atoms.
If utilized, chelating agents or transition-metal-selective sequestrants will preferably comprise from about 0.001% to about 10%, more preferably from about 0.05% to about 1 % by weight of the compositions herein.
7. Dispersant Polymer - Preferred ADD compositions herein may additionally 20 contain a dispersant polymer. When present, a dispersant polymer in the instant ADD compositions is typically at levels in the range from 0 to about 25%, preferably from about 0.5% to about 20%, more preferably from about I% to about 8% by weight of the ADD composition. Dispersant polymers are useful for improved filming performance of the present ADD compositions, especially in 25 higher pH embodiments, such as those in which wash pH exceeds about 9.5.
Particularly preferred are polymers which inhibit the deposition of calcium carbonate or magnesium silicate on dishware.
Dispersant polymers suitable for use herein are further illustrated by the film forming polymers described in U.S. Pat. No. 4,379,080 (Murphy), issued Apr. 5, 30 1983.
Suitable polymers are preferably at least partially neutralized or alkali metal, ammonium or substituted ammonium (e.g., mono-, di- or triethanolammonium) salts of polycarboxylic acids. The alkali metal, especially sodium salts are most preferred. While the molecular weight of the polymer can vary over a wide range, it preferably is from about 1,000 to about 500,000, more preferably is from about 1,000 to about 20,000, and most preferably, especially if the ADD is for use in North American automatic dishwashing appliances, is from about 1,000 to about 5,000.
Other suitable dispersant polymers include those disclosed in U.S. Patent No.
3.308,067 issued March 7, 1967, to Diehl. Unsaturated monomeric acids that can be polymerized to form suitable dispersant polymers include acrylic acid, malefic acid (or malefic anhydride), fumaric acid, itaconic acid, aconitic acid, mesaconic acid, citraconic acid and methylenemalonic acid. The presence of monomeric segments containing no carboxylate radicals such as methyl vinyl ether, styrene, ethylene, etc.
is suitable provided that such segments do not constitute more than about 50%
by weight of the dispersant polymer.
Copolymers of acrylarnide and acrylate having a molecular weight of from about 3,000 to about 100,000, preferably from a)~out 4,000 to about 20,000, and an acrylamide content of less than about 50%, preferably less than about 20%, by weight of the dispersant polymer can also be used. Most preferably, such dispersant polymer has a molecular weight of from about 4,000 to about 20,()00 and an acrylamide content of from about 0% fo about 15%, by weight of the polymer.
Particularly preferred dispersant polymers are low molecular weight modified polyacrylate copolymers. Such copolymers contain as monomer units: a) from about 90% to about 10%, preferably from about 80% to about 20% by weight acrylic acid or its salts and b) from about 10% to about 90%, preferably from about 20% to about 80% by weight of a substituted acrylic monomer or its salt and have the general formula: -[(C(R2)C(R1){C(O)ORS)] wherein the apparently unfilled valencies are in fact occupied by hydrogen and at least one of the substituents Rl, R2, or RS, preferably R1 or R2, is a 1 to 4 carbon alkyl or hydroxyalkyl group; R1 or R2 can be a hydrogen and RS can be a hydrogen or alkali metal salt. Most preferred is a substituted acrylic monomer wherein R1 is methyl, R2 is hydrogen, and R3 is sodium.
Suitable low molecular weight polyacrylate dispersant polymer preferably has a molecular weight of less than about 15,000, preferably from about 500 to about 10,000, most preferably from about 1,000 to about 5,000. The most preferred polyacrylate copolymer for use herein has a molecular weight of about 3,500 and is the fully neutralized form of the polymer comprising about 70% by weight acrylic acid and about 30% by weight methacrylic acid.
Other suitable modified polyacrylate copolymers include the low molecular weight copolymers of unsaturated aliphatic carboxylic acids disclosed in U.S.
5 Patents 4,530,766, and 5,084,535.
Agglomerated forms of the present ADD compositions may employ aqueous solutions of polymer dispersants as liquid binders for making the agglomerate (particularly when the composition consists of a mixture of sodium citrate and sodium carbonate). Especially preferred .are polyacrylates with an average 10 molecular weight of from about 1,000 to about 10,000, and acrylate/maleate or acrylate/fumarate copolymers with an average molecular weight of from about 2,000 to about 80,000 and a ratio of acrylate to maleate or fumarate segments of from about 30:1 to about 1:2. Examples of such copolymers based on a mixture of unsaturated mono- and dicarboxylate monomers are disclosed in European Patent 15 Application No. 66,915, published December 15, 1982.
Other dispersant polymers useful herein include the polyethylene glycols and polypropylene glycols having a molecular weight of from about 950 to about 30,000 which can be obtained from the Dow Chemical Company of Midland, Michigan.
Such compounds for example, having a melting point within the range of from about 20 30oC to about 100oC, can be obtained at molecular weights of 1,450, 3,400, 4,500, 6,000, 7,400, 9,500, and 20,000. Such compounds are formed by the polymerization of ethylene glycol or propylene glycol with the requisite number of moles of ethylene or propylene oxide to provide the desired molecular weight and melting point of the respective polyethylene glycol and polypropylene glycol. The 25 polyethylene, polypropylene and mixed glycols are referred to using the formula:
HO(CH2CH20)m(CH2CH(CI-I3)O)n(CH(CH3)CH20)oOH wherein m, n, and o are integers satisfying the molecular weight and temperature requirements given above.
Yet other dispersant polymers useful herein include the cellulose sulfate esters such as cellulose acetate sulfate, cellulose sulfate, hydroxyethyl cellulose sulfate, 30 methylceilulose sulfate, and hydroxypropylcellulose sulfate. Sodium cellulose sulfate is the most preferred polymer of this group.
Other suitable dispersant polymers are the carboxylated polysaccharides, particularly starches, celluloses and alginates, described in U.S. Pat. No.
3,723,322, Diehl, issued Mar. 27, 1973; the dextrin esters of polycarboxylic acids disclosed in U.S. Pat. No. 3,929,107, Thompson, issued Nov. 11, 1975; the hydroxyalkyl starch ethers.'starch esters, oxidized starches, dextrins and starch hydrolysates described in U.S. Pat No. 3,803,285, Jensen, issued Apr. 9, 1974; the carboxylated starches described in U.S. Pat. No. 3,629,121, Eldib, issued Dec. 21, 1971; and the dextrin starches described in U.S. Pat. No. 4,141,841, MeDonald, issued Feb. 27, 1979.
Preferred cellulose-derived dispersant polymers are the carboxymethyl celluloses.
Yet another group of acceptable dispersants are the organic dispersant polymers, such as polyaspartate.
8. Material Care Agents - The present ADD compositions may contain one or more material care agents which are effective as corrosion inhibitors and/or anti tarnish aids. Such materials are preferred components of machine dishwashing compositions especially in certain European countries where the use of electroplated nickel silver and sterling silver is still comparatively common in domestic flatware, or when aluminium protection is a concern and,the composition is low in silicate.
1 S Generally, such material care agents include metasilicate, silicate, bismuth salts, manganese salts, paraffin, triazoles, pyrazoles, thiols, mercaptans, aluminium fatty acid salts, and mixtures thereof.
When present, such protecting materials are preferably incorporated at low levels, e.g., from about 0.01% to about S% of the ADD composition. Suitable corrosion inhibitors include paraffin oil, typically a predominantly branched aliphatic hydrocarbon having a number of carbon atoms in the range of from about 20 to about 50; preferred paraffin oil is selected from predominantly branched 45 species with a ratio of cyclic to noncyclic hydrocarbons of about 32:68. A
paraffin oil meeting those characteristics is sold by Wintershall, Salzbergen, Germany, under the trade name WINOG 70. Additionally, the addition of low levels of bismuth nitrate (i.e., Bi(N03)3) is also preferred.
Other corrosion inhibitor compounds include benzotriazole and comparable compounds; mercaptans or thiols including thionaphtol and thioanthranol; and finely divided Aluminium fatty acid salts, such as aluminium tristearate. The formulator will recognize that such materials will generally be used judiciously and in limited quantities so as to avoid any tendency to produce spots or films on glassware or to compromise the bleaching action of the compositions. For this reason, mercaptan anti-tarnishes which are quite strongly bleach-reactive and common fatty carboxylic acids which precipitate with calcium in particular are preferably avoided.
9. Silicone and Phosphate Ester Suds Suppressors - The ADD's of the invention can optionally contain an alkyl phosphate ester suds suppressor, a silicone suds suppressor, or combinations thereof. Levels in general are from 0% to about
10%, preferably, from about 0.001% to about 5%. Typical levels tend to be low, e.g., from about O.OI% to about 3% when a silicone $uds suppressor is used.
Preferred non-phosphate compositions omit the phosphate ester component entirely.
Silicone suds suppressor technology and other defoaming agents useful herein are extensively documented in "Defoaming, Theory and Industrial Applications", Ed., P.R. Garrett, Marcel Dekker, N.Y., 1973,, ISBN 0-8247-8770-6, incorporated IO herein by reference. See especially the chapters entitled "Foam control in Detergent Products" (Ferch et al) and "Surfactant Antifoams'' (Blease et al). See also U.S.
Patents 3,933,672 and 4,136,045. Highly preferred silicone suds suppressors are the compounded types known for use in laundry detergents such as heavy-duty granules, althpugh types hitherto used only in heavy-duty liquid detergents may also be incorporated in the instant compositions. For example, polydimethylsiloxanes having trimethylsilyl or alternate endblocking units may be used as the silicone.
These may be compounded with silica and/or with surface-active nonsilicon components, as illustrated by a suds suppressor comprising 12%
silicone/silica, 18%
stearyl alcohol and 70% starch in granular form. A suitable commercial source of the silicone active compounds is Dow Corning Corp.
Levels of the suds suppressor depend to some extent on the sudsing tendency of the composition, for example, an ADD for use at 2000 ppm comprising 2%
octadecyldimethyiamine oxide may not require the presence of a suds suppressor.
Indeed, it is an advantage of the present invention to select cleaning-effective amine oxides which are inherently much lower in foam-forming tendencies than the typical coco amine oxides. In contrast, formulations in which amine oxide is combined with a high-foaming anionic cosurfactant, e.g., alkyl ethoxy sulfate, benefit greatly from the presence of suds suppressor.
Phosphate esters have also been asserted to provide some protection of silver and silver-plated utensil surfaces; however, the instant compositions can have excellent silvercare without a phosphate ester component. Without being limited by theory, it is believed that lower pH formulations, e.g., those having pH of 9.~ and below, plus the presence of the low level amine oxide, both contribute to improved silver care.
If it is desired nonetheless to use a phosphate ester, suitable connpounds are disclosed in U.S. Patent 3,314,891, issued April 18, 1967, to Schmolka et al, incorporated herein by reference. Preferred alkyl phosphate esters cont<-tin from 16-20 carbon atoms. Highly preferred alkyl phosphate esters are monostearyl acid phosphate or monooieyl acid phosphate, or salts thereof, particularly alkali metal salts, or mixtures thereof.
It has been found preferable to avoid the use of simple calcium-precipitating soaps as antifoams in the present compositions as they tend to deposit on the dishware. Indeed, phosphate esters are not entirely free of such problems and the formulator will generally choose to minimize the content of potentially depositing antifoams in the instant compositions.
10. Other Optional Adiuncts - Depending on whether a greater or lesser degree of compactness is required, filler materials can also be present in the instant ADDs.
These include sucrose, sucrose esters, sodium Sulfate, potassium sulfate, etc., in amounts up to about 70%, preferably from 0% to about 40% of the ADD
composition. Preferred filler is sodium sulfate, especially in good grades having at most low levels of trace impurities.
Sodium sulfate used herein preferably has a purity sufficient to ensure it is non-reactive with bleach; it may also be treated with low levels of sequestrants, such as phosphonates or EDDS in magnesium-salt form. Note that preferences, in terms of purity sufficient to avoid decomposing bleach, applies also to pH-adjusting component ingredients, specifically including any silicates used herein.
Although optionally present in the instant compositions, the present invention encompasses embodiments which are substantially free from sodium chloride or potassium chloride.
Hydrotrope materials such as sodium benzene sulfonate, sodium toluene sulfonate, sodium cumene sulfonate, etc., can be present, e.g., for better dispersing surfactant.
Bleach-stable perfumes (stable as to odor); and bleach-stable dyes such as those disclosed in U.S. Patent 4,714,562, Roselle et al, issued December 22, can also be added to the present compositions in appropriate amounts. Other common detergent ingredients consistent with the spirit and scope of the present invention are not excluded.
Since ADD compositions herein can contain water-sensitive ingredients or ingredients which can co-react when brought together in an aqueous environment, it is desirable to keep the free moisture content of the ADDS at a minimum, e.g., 7% or less, preferably 4% or less of the ADD; and to provide packaging which is substantially impermeable to water and carbon dioxide. Coating measures have been described herein to illustrate a way to protect the ingredients from each other and from air and moistwe. Plastic bottles, including refillable or recyclable types, as well as conventional barrier cartons or boxes are another helpful means ~of assuring maximum shelf storage stability. As noted; when ingredients are not highly compatible, it may further be desirable to coat at least one such ingredient with a low-foaming nonionic surfactant for protection. There are numerous waxy materials which can readily be used to form suitable coated particles of any such otherwise incompatible components; however, the formulator prefers those materials which do not have a marked tendency to deposit or form films on dishes including those of plastic construction.
Some preferred substantially chlorine bleach-free granular automatic dishwashing compositions of the invention are as follows: a substantially chlorine-bleach free automatic dishwashing composition comprising amylase (e.g., TERMAMYL~) and/or a bleach stable amylase and a bleach system comprising a source of hydrogen peroxide selected from sodium perborate and sodium percarbonate and a cobalt catalyst as defined herein.
There is also contemplated a substantially chlorine-bleach free automatic dishwashing composition comprising an oxidative stability-enhanced amylase and a bleach system comprising a source of hydrogen peroxide selected from sodium perborate and sodium percarbonate, a cobalt catalyst, and TAED or NOBS.
Method for Cleanintz:
The present invention also encompasses a method for cleaning soiled tableware comprising contacting said tableware with an aqueous medium comprising a cobalt catalyst, preferably at a concentration of from about 2 ppm to about 10 ppm, as described herein before. Preferred aqueous medium have an initial pH in a wash solution of above about 8, more preferably from about 9.5 to about 12, most preferably from about 9.5 to about 10.5.
This invention also encompasses a method of washing tableware in a domestic automatic dishwashing appliance, comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising amylase and a cobalt catalyst.
Synthesis Methods for Cobalt Catalysts:
The preferred cobalt bleach catalysts having carboxylate ligands may further 5 be made by the following synthesis methods which are illustrated for the preferred catalysts [Co(NH3)50Ac] C12; [Co(NH3)50Ac] (OAc)2; [Co(NH3)50Ac](PF6)2, and [Co(NH3)50Ac](N03)2.
Synthesis of [ColNH3)SOAc C1_, Synthesis Example 1 [Co(NH3)5C1]C12 (26.4 g, 0.10 mol) is added to distilled water (800 mL):
NH40H (23.4 mL, 0.600 mol) is slowly added with stirring. The solution is then heated to 75°C and the solid dissolves with stirring. The solution is cooled to RT.
Acetic anhydride (30.6 g, 0.30 mol) is slowly added with stirring. The solution is stirred 1 hour at RT. At this point the reaction solution can either be lyophilized to a pink powder or the solution can be rotovapped down and the resulting solid pumped on overnight at 0.05 mm. to remove residual water and NH40Ac. The excess ammonium acetate and ammonitun chloride salts can also be removed by washing the solid with ethanol. Yield 35 gr., 78.1% by uv-vis spectroscopy. HPLC
[according to the method of D.A. Buckingham, et al, InoreLChem., 28, 4567-4574 { 1989)] shows all of the cobalt is present as [Co(NH3)50Ac)C12.
S,mthesis Example 2:
NH4C1 (25.0 g) is dissolved in NH40H (150 mL). [Co(H20)6]C12 (26.4 g, 0.10 mol) is added to this solution forming a slurry. H202 (30%, 44.0 mL) is slowly dripped into the solution with stirring. Acetic anhydride (30.6 g, 0.30 mol) is slowly added with stirring. The solution is stirred 1 hour at RT. At this point the reaction solution can either be lyophilized to a pink powder or the solution can be rotovapped down and the resulting solid pumped on overnight at 0.05 mm: to remove residual water and NH40Ac. The excess ammonium acetate and ammonium chloride salts can also be removed by washing the solid with ethanol.
Yield 35 gr., 78.1% by uv-vis spectroscopy. HPLC [according to the method of D.A. Buckingham, et al, Inor~ Chem., 28, 4567-4574 (I989)] shows all of the cobalt is present as [Co(NH3)50Ac]C12_ Synthesis Example 3:
Ammonium hydroxide (4498.0 mL, 32.3 mol,'28%) and ammonium chloride (749.8 g, 14.0 mol) are combined in a 12 L three-necked round-bottomed flask fitted with a condenser, internal thermometer, mechanical stirrer, and addition funnel.
S Once the mixture becomes homogeneous, cobalt(I,I) chloride hexahydrate ( 1500.0 g, 6.3 mol) is added in portions over 5 min forming a slurry. The reaction mixture warms to 50 °C and takes on a muddy color. H202 (429.0 g, 6.3 mol, 50%) is added over 30 min. The mixture becomes deep red and homogeneous and the temperature raises to 60-65 °C during addition .of the peroxide.
Ammonium acetate (485:9 g, 6.3 mol) is then added to the mixture 30 min later. After stirring an additional 15 min, acetic anhydride (2242.5 g, 22.1 mol) is added over 1 h.
The anhydride is added so as to keep the reaction temperature below 75 °C.
The mixture is stirred for 2 h as it cools. The red mixture is filtered and the fitrate treated with isopropanol until an orange-pink solid forms. The solid is collected, washed with isopropanol, ether, and dried to give an orange-pink solid. UV-Vis measurements indicate the product to be 95.3% pwe as [Co(NH3)SOAc]C12.
Synthesis of fCo(NH3~SOAcJ (OAc)2.
Ammonium hydroxide (286.0 mL, 2.06 mol, 28%) and ammonium acetate (68.81 g, 0.89 mol) are combined in a 1000 mL three-necked round-bottomed flask fitted with a condenser, internal thermometer, mechanical stirrer, and addition funnel. Once the mixture becomes homogeneous, cobalt(II) acetate tetrahydrate (100.00 g, 0.40 mol) is added in portions over 5 min. The mixture becomes black and warms to 31° C. The mixture is treated with H202 (27.32 g, 0.40 mol, 50%) dropwise over 15 min. The mixture further exotherms to 53° C and toms deep red once addition is complete. After stirring for 1 h, HPLC analysis indicates that all of the cobalt is present as [Co(NH3)SOAc](OAc)2. Concentration yields the desired complex as a red solid.
Synthesis of fCo(NH_3~_50Ac PF_ _2 The [Co(IVH3)SOAc] (OAc)2 product of the preceeding example is treated with 1 equivalent of NaPF6 in water at room temperature. The reaction mixtwe is stirred for one 1 h, concentrated to a viscous liquid, and cooled to 10-15°C. Red crystals precipitate from the mixtwe and are collected by filtration. HPLC
analysis of the red product indicates all of the cobalt is present as [Co(NH3)SOAc](PF6)2.
Synthesis of Pentaammineacetatocobalt(III) Nitrate Ammonium acetate (67.83 g, 0.880 mol) and ammonium hydroxide (256.62, 2.050 mol, 28%) are combined in a 1000 ml three-necked round-bottomed flask fitted with a condenser, mechanical stirrer, and internal thermometer.
Cobalt(II) acetate tetrahydrate ( 110.00 g, 0.400 mol) is added to the clear solution that becomes brown-black once addition of the metal salt is complete. The mixtwe warms briefly to 40 °C. Hydrogen peroxide (27.21 g, 0.400 mol, 50%) is added dropwise over 2U
min. The reaction warms to 60-65 °C and turns red as the peroxide is added to the reaction mixture. After stirring for an additional 20 min., the red mixture is treated with a solution of sodium nitrate (74.86 g, 0.880 mol) dissolved in SO ml of water.
As the mixture stands at room temperature, red crystals form. The solid is collected by filtration and washed with cold water and isopropanol to give 6.38 g (4.9%) of the complex as a red solid. The combined filtrates are concentrated by rotary evaporation (50-55 °C, 15 mm Hg (water aspirator vacuum)) to a slurry.
The slurry is filtered and the red solid remaining is washed with cold water and isupropanol to give 89.38 g (68.3%) of the complex: Total yield: 95.76 g (73.1%). Analysis by HPLC, UV-Vis, and combustion are consistent with the proposed structure.
Anal. Calcd for C2H18CoN70g: C, 7.34; H, 5.55; N, 29.97; Co, 18.01.
Found: C, 7.31; H, 5.72; N, 30.28; Co, 18.65.
The following nonlimiting examples further illustrate ADD compositions of the present invention.
Ingredients: Weight%
Sodium Tripolyphosphate (STPP) 24.0 Sodium carbonate 20.0 Hydrated 2.Or silicate 15 Nonionic surfactant 2.0 Polymerl 4.0 Protease (4% active) 0.83 Amylase (0.8% active) 0.5 Perborate monohydrate ( 15.5% 14.5 Active Av0)2 Cobalt catalyst3 0.008 Dibenzoyl Peroxide (18% active) 4.4 Water, sodium sulfate and misc. Balance 1 Terpolymer selected from either 60% acrylic acid/20% malefic acid/20% ethyl acrylate, or 70% acrylic acid/10% malefic acid/20% ethyl acrylate.
~ The Av0 level of the above formula is 2.2%.
3 Pentaammineacetatocobalt(III) nitrate.prepared as described hereinbefore;
may be replaced by MnTACN.
The ADD's of the above dishwashing detergent composition examples are used to wash tea-stained cups, starch-soiled and spaghetti-soiled dishes, milk-soiled glasses, starch, cheese,.egg or babyfood- soiled flatware, and tomato-stained plastic spatulas by loading the soiled dishes in a domestic automatic dishwashing appliance and washing using either cold fill, 60oC peak; or uniformly 45-SOoC wash cycles with a product concentration of the exemplary compositions of from about 1,000 to about 5,000 ppm, with excellent results.
The following examples further illustrate phosphate built ADD compositions which contain a bleach/enzyme particle, but are not intended to be limiting thereof.
1 ~ All percentages noted are by weight of the finished compositions, other than the perborate (monohydrate) component, which is listed as Av0_ _2 3 Catalystl 0.008 0.004 SavinaseTM 12T -- 1.12 Protease D 0.9 --DuramylTM 1.5 0.75 STPP 31.0 30.0 Na2C03 20.0 30.5 Polymer3 4.0 --Perborate (Av0) 2.2 0.7 Dibenzoyl Peroxide 0.2 0.15 2 R Silicate (Si02) 8.0 3.5 Paraffin 0.5 0.5 Benzotriazole 0.3 0.15 PLURAFACT"s 2.0 0.75 Sodium Sulfate, Moisture -------Balance----------1 Pentaacnmineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N or polyacrylate/polymethacrylate copolymers.
In Compositions of Examples 2 and 3, respectively, the catalyst and enzymes are introduced into the compositions as 200-2400 micron composite particles which are prepared by spray coating, fluidized bed granulation, marumarizing, grilling or flaking/grinding operations. If desired, the protease and amylase enzymes may be separately formed into their respective catalystlenzyme composite particles, for reasons of stability, and these separate composites added to the compositions.
The following describes catalyst/enzyme particles (prepared by drum granulation) for use in the present invention compositions. For example ~, the catalyst is incorporated as part of the granule core, and for example 4 the catalyst is post added as a coating. The mean particle size is in the range from about 200 to 800 microns.
CatalystlEnzvme Particles for Examples 4 and 5 , l5 4 5 Core Cobalt Catalyst (PAC)- 0.3 Amylase, commercial 0.4 0.4 Fibrous Cellulose 2.0 2.0 PVP 1.0 1.0 Sodium Sulphate 93.3 93.3 Coating Titanium Dioxide 2.0 2.0 PEG 1.0 t.0 Cobalt Catalyst (PAC) 0.3 -Granular dishwashing detergents wherein Example 4 is a Compact product and Example 5 is a Regular/Fluffy product are as follows:
Composite Particle 1.5 0.75 SavinaseTM 12T 2.2 -Protease D -- 0.45 STPP 34.5 30.0 Na~C03 20.0 30.5 Acuso1480N 4.0 --Perborate(Av0) 2.2 0.7 Dibenzoyl Peroxide 0.2 0.15 5 2 R Silicate(Si02) 8.0 3:5 Paraffin -- 0.5 Benzotriazole -- 0.15 PlurafacTM -- 0.75 Sodium Sulphate, Moisture ---to balance----------Other,compositions herein are as follows:
EXAMPLES f,- 8 STPP 34.4 34.4 34.4 Na2C03 20.0 30.0 30.5 Polymer3 4.0 -- --Perborate (Av0) 2.2 I .0 0.7 Catatystl 0.008 0.004 0.004 SavinaseTM 6.OT -- 2.02 2.0' Protease D 0.9 -- --DuramylTM i .5 0.75 --TermamylT"~ b.OT -- -- 1.0 Dibenzoyl Peroxide (active) 0.8 0.6 0.4 2 R Silicate (Si02) 8.0 6.0 4.0 Nonionic Surfactant'4 2.0 1.5 1.2 Sodium Sulfate, Moisture ________~___ g~~ce ~___________ I Pentaainineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N.
4 PolyTergent SLF-18 from Olin Corporation.
In Compositions of Examples 6-8, respectively, the catalyst and enzymes are introduced into the final compositions as 200-2400 micron catalyst/enzyme composite particles which are prepared by spray coating, marumarizing, prilling or flaking/grinding operations. If desired, the protease and amylase enzymes may be separately formed into their respective catalyst/enzyme composite particles, for reasons of stability, and these separate composites added to the compositions.
S STPP 31.0 31.0 31.0 Na2C03 20.0 20.0 20.0 Polymer3 4.0 4.0 4.0 Perborate (Av0) 2.2 2.2 2.2 Catalystl 0.008 0.018 0.018 SavinaseTM 6.OT2 2.0 2.0 2.0 TermamyiTM 6.OT 1.0 1.0 1.0 TAED 2.0 -- --2 R Silicate (Si02) 8.0 8.0 8.0 Metasilicate -- -- ~ 2.5 Nonionic Surfaciant4 2.0 2.0 2.0 Sodium Sulfate, Moisture -------------- Balance -- ---- -----1 Pentaamineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N.
4 PolyTergent SLF-18 from Olin Corporation.
Any of the foregoing ADD compositions can be used in the conventional manner in an automatic dishwashing machine to cleanse dishware, glassware, cookingleating utensils, and the like.
Preferred non-phosphate compositions omit the phosphate ester component entirely.
Silicone suds suppressor technology and other defoaming agents useful herein are extensively documented in "Defoaming, Theory and Industrial Applications", Ed., P.R. Garrett, Marcel Dekker, N.Y., 1973,, ISBN 0-8247-8770-6, incorporated IO herein by reference. See especially the chapters entitled "Foam control in Detergent Products" (Ferch et al) and "Surfactant Antifoams'' (Blease et al). See also U.S.
Patents 3,933,672 and 4,136,045. Highly preferred silicone suds suppressors are the compounded types known for use in laundry detergents such as heavy-duty granules, althpugh types hitherto used only in heavy-duty liquid detergents may also be incorporated in the instant compositions. For example, polydimethylsiloxanes having trimethylsilyl or alternate endblocking units may be used as the silicone.
These may be compounded with silica and/or with surface-active nonsilicon components, as illustrated by a suds suppressor comprising 12%
silicone/silica, 18%
stearyl alcohol and 70% starch in granular form. A suitable commercial source of the silicone active compounds is Dow Corning Corp.
Levels of the suds suppressor depend to some extent on the sudsing tendency of the composition, for example, an ADD for use at 2000 ppm comprising 2%
octadecyldimethyiamine oxide may not require the presence of a suds suppressor.
Indeed, it is an advantage of the present invention to select cleaning-effective amine oxides which are inherently much lower in foam-forming tendencies than the typical coco amine oxides. In contrast, formulations in which amine oxide is combined with a high-foaming anionic cosurfactant, e.g., alkyl ethoxy sulfate, benefit greatly from the presence of suds suppressor.
Phosphate esters have also been asserted to provide some protection of silver and silver-plated utensil surfaces; however, the instant compositions can have excellent silvercare without a phosphate ester component. Without being limited by theory, it is believed that lower pH formulations, e.g., those having pH of 9.~ and below, plus the presence of the low level amine oxide, both contribute to improved silver care.
If it is desired nonetheless to use a phosphate ester, suitable connpounds are disclosed in U.S. Patent 3,314,891, issued April 18, 1967, to Schmolka et al, incorporated herein by reference. Preferred alkyl phosphate esters cont<-tin from 16-20 carbon atoms. Highly preferred alkyl phosphate esters are monostearyl acid phosphate or monooieyl acid phosphate, or salts thereof, particularly alkali metal salts, or mixtures thereof.
It has been found preferable to avoid the use of simple calcium-precipitating soaps as antifoams in the present compositions as they tend to deposit on the dishware. Indeed, phosphate esters are not entirely free of such problems and the formulator will generally choose to minimize the content of potentially depositing antifoams in the instant compositions.
10. Other Optional Adiuncts - Depending on whether a greater or lesser degree of compactness is required, filler materials can also be present in the instant ADDs.
These include sucrose, sucrose esters, sodium Sulfate, potassium sulfate, etc., in amounts up to about 70%, preferably from 0% to about 40% of the ADD
composition. Preferred filler is sodium sulfate, especially in good grades having at most low levels of trace impurities.
Sodium sulfate used herein preferably has a purity sufficient to ensure it is non-reactive with bleach; it may also be treated with low levels of sequestrants, such as phosphonates or EDDS in magnesium-salt form. Note that preferences, in terms of purity sufficient to avoid decomposing bleach, applies also to pH-adjusting component ingredients, specifically including any silicates used herein.
Although optionally present in the instant compositions, the present invention encompasses embodiments which are substantially free from sodium chloride or potassium chloride.
Hydrotrope materials such as sodium benzene sulfonate, sodium toluene sulfonate, sodium cumene sulfonate, etc., can be present, e.g., for better dispersing surfactant.
Bleach-stable perfumes (stable as to odor); and bleach-stable dyes such as those disclosed in U.S. Patent 4,714,562, Roselle et al, issued December 22, can also be added to the present compositions in appropriate amounts. Other common detergent ingredients consistent with the spirit and scope of the present invention are not excluded.
Since ADD compositions herein can contain water-sensitive ingredients or ingredients which can co-react when brought together in an aqueous environment, it is desirable to keep the free moisture content of the ADDS at a minimum, e.g., 7% or less, preferably 4% or less of the ADD; and to provide packaging which is substantially impermeable to water and carbon dioxide. Coating measures have been described herein to illustrate a way to protect the ingredients from each other and from air and moistwe. Plastic bottles, including refillable or recyclable types, as well as conventional barrier cartons or boxes are another helpful means ~of assuring maximum shelf storage stability. As noted; when ingredients are not highly compatible, it may further be desirable to coat at least one such ingredient with a low-foaming nonionic surfactant for protection. There are numerous waxy materials which can readily be used to form suitable coated particles of any such otherwise incompatible components; however, the formulator prefers those materials which do not have a marked tendency to deposit or form films on dishes including those of plastic construction.
Some preferred substantially chlorine bleach-free granular automatic dishwashing compositions of the invention are as follows: a substantially chlorine-bleach free automatic dishwashing composition comprising amylase (e.g., TERMAMYL~) and/or a bleach stable amylase and a bleach system comprising a source of hydrogen peroxide selected from sodium perborate and sodium percarbonate and a cobalt catalyst as defined herein.
There is also contemplated a substantially chlorine-bleach free automatic dishwashing composition comprising an oxidative stability-enhanced amylase and a bleach system comprising a source of hydrogen peroxide selected from sodium perborate and sodium percarbonate, a cobalt catalyst, and TAED or NOBS.
Method for Cleanintz:
The present invention also encompasses a method for cleaning soiled tableware comprising contacting said tableware with an aqueous medium comprising a cobalt catalyst, preferably at a concentration of from about 2 ppm to about 10 ppm, as described herein before. Preferred aqueous medium have an initial pH in a wash solution of above about 8, more preferably from about 9.5 to about 12, most preferably from about 9.5 to about 10.5.
This invention also encompasses a method of washing tableware in a domestic automatic dishwashing appliance, comprising treating the soiled tableware in an automatic dishwasher with an aqueous alkaline bath comprising amylase and a cobalt catalyst.
Synthesis Methods for Cobalt Catalysts:
The preferred cobalt bleach catalysts having carboxylate ligands may further 5 be made by the following synthesis methods which are illustrated for the preferred catalysts [Co(NH3)50Ac] C12; [Co(NH3)50Ac] (OAc)2; [Co(NH3)50Ac](PF6)2, and [Co(NH3)50Ac](N03)2.
Synthesis of [ColNH3)SOAc C1_, Synthesis Example 1 [Co(NH3)5C1]C12 (26.4 g, 0.10 mol) is added to distilled water (800 mL):
NH40H (23.4 mL, 0.600 mol) is slowly added with stirring. The solution is then heated to 75°C and the solid dissolves with stirring. The solution is cooled to RT.
Acetic anhydride (30.6 g, 0.30 mol) is slowly added with stirring. The solution is stirred 1 hour at RT. At this point the reaction solution can either be lyophilized to a pink powder or the solution can be rotovapped down and the resulting solid pumped on overnight at 0.05 mm. to remove residual water and NH40Ac. The excess ammonium acetate and ammonitun chloride salts can also be removed by washing the solid with ethanol. Yield 35 gr., 78.1% by uv-vis spectroscopy. HPLC
[according to the method of D.A. Buckingham, et al, InoreLChem., 28, 4567-4574 { 1989)] shows all of the cobalt is present as [Co(NH3)50Ac)C12.
S,mthesis Example 2:
NH4C1 (25.0 g) is dissolved in NH40H (150 mL). [Co(H20)6]C12 (26.4 g, 0.10 mol) is added to this solution forming a slurry. H202 (30%, 44.0 mL) is slowly dripped into the solution with stirring. Acetic anhydride (30.6 g, 0.30 mol) is slowly added with stirring. The solution is stirred 1 hour at RT. At this point the reaction solution can either be lyophilized to a pink powder or the solution can be rotovapped down and the resulting solid pumped on overnight at 0.05 mm: to remove residual water and NH40Ac. The excess ammonium acetate and ammonium chloride salts can also be removed by washing the solid with ethanol.
Yield 35 gr., 78.1% by uv-vis spectroscopy. HPLC [according to the method of D.A. Buckingham, et al, Inor~ Chem., 28, 4567-4574 (I989)] shows all of the cobalt is present as [Co(NH3)50Ac]C12_ Synthesis Example 3:
Ammonium hydroxide (4498.0 mL, 32.3 mol,'28%) and ammonium chloride (749.8 g, 14.0 mol) are combined in a 12 L three-necked round-bottomed flask fitted with a condenser, internal thermometer, mechanical stirrer, and addition funnel.
S Once the mixture becomes homogeneous, cobalt(I,I) chloride hexahydrate ( 1500.0 g, 6.3 mol) is added in portions over 5 min forming a slurry. The reaction mixture warms to 50 °C and takes on a muddy color. H202 (429.0 g, 6.3 mol, 50%) is added over 30 min. The mixture becomes deep red and homogeneous and the temperature raises to 60-65 °C during addition .of the peroxide.
Ammonium acetate (485:9 g, 6.3 mol) is then added to the mixture 30 min later. After stirring an additional 15 min, acetic anhydride (2242.5 g, 22.1 mol) is added over 1 h.
The anhydride is added so as to keep the reaction temperature below 75 °C.
The mixture is stirred for 2 h as it cools. The red mixture is filtered and the fitrate treated with isopropanol until an orange-pink solid forms. The solid is collected, washed with isopropanol, ether, and dried to give an orange-pink solid. UV-Vis measurements indicate the product to be 95.3% pwe as [Co(NH3)SOAc]C12.
Synthesis of fCo(NH3~SOAcJ (OAc)2.
Ammonium hydroxide (286.0 mL, 2.06 mol, 28%) and ammonium acetate (68.81 g, 0.89 mol) are combined in a 1000 mL three-necked round-bottomed flask fitted with a condenser, internal thermometer, mechanical stirrer, and addition funnel. Once the mixture becomes homogeneous, cobalt(II) acetate tetrahydrate (100.00 g, 0.40 mol) is added in portions over 5 min. The mixture becomes black and warms to 31° C. The mixture is treated with H202 (27.32 g, 0.40 mol, 50%) dropwise over 15 min. The mixture further exotherms to 53° C and toms deep red once addition is complete. After stirring for 1 h, HPLC analysis indicates that all of the cobalt is present as [Co(NH3)SOAc](OAc)2. Concentration yields the desired complex as a red solid.
Synthesis of fCo(NH_3~_50Ac PF_ _2 The [Co(IVH3)SOAc] (OAc)2 product of the preceeding example is treated with 1 equivalent of NaPF6 in water at room temperature. The reaction mixtwe is stirred for one 1 h, concentrated to a viscous liquid, and cooled to 10-15°C. Red crystals precipitate from the mixtwe and are collected by filtration. HPLC
analysis of the red product indicates all of the cobalt is present as [Co(NH3)SOAc](PF6)2.
Synthesis of Pentaammineacetatocobalt(III) Nitrate Ammonium acetate (67.83 g, 0.880 mol) and ammonium hydroxide (256.62, 2.050 mol, 28%) are combined in a 1000 ml three-necked round-bottomed flask fitted with a condenser, mechanical stirrer, and internal thermometer.
Cobalt(II) acetate tetrahydrate ( 110.00 g, 0.400 mol) is added to the clear solution that becomes brown-black once addition of the metal salt is complete. The mixtwe warms briefly to 40 °C. Hydrogen peroxide (27.21 g, 0.400 mol, 50%) is added dropwise over 2U
min. The reaction warms to 60-65 °C and turns red as the peroxide is added to the reaction mixture. After stirring for an additional 20 min., the red mixture is treated with a solution of sodium nitrate (74.86 g, 0.880 mol) dissolved in SO ml of water.
As the mixture stands at room temperature, red crystals form. The solid is collected by filtration and washed with cold water and isopropanol to give 6.38 g (4.9%) of the complex as a red solid. The combined filtrates are concentrated by rotary evaporation (50-55 °C, 15 mm Hg (water aspirator vacuum)) to a slurry.
The slurry is filtered and the red solid remaining is washed with cold water and isupropanol to give 89.38 g (68.3%) of the complex: Total yield: 95.76 g (73.1%). Analysis by HPLC, UV-Vis, and combustion are consistent with the proposed structure.
Anal. Calcd for C2H18CoN70g: C, 7.34; H, 5.55; N, 29.97; Co, 18.01.
Found: C, 7.31; H, 5.72; N, 30.28; Co, 18.65.
The following nonlimiting examples further illustrate ADD compositions of the present invention.
Ingredients: Weight%
Sodium Tripolyphosphate (STPP) 24.0 Sodium carbonate 20.0 Hydrated 2.Or silicate 15 Nonionic surfactant 2.0 Polymerl 4.0 Protease (4% active) 0.83 Amylase (0.8% active) 0.5 Perborate monohydrate ( 15.5% 14.5 Active Av0)2 Cobalt catalyst3 0.008 Dibenzoyl Peroxide (18% active) 4.4 Water, sodium sulfate and misc. Balance 1 Terpolymer selected from either 60% acrylic acid/20% malefic acid/20% ethyl acrylate, or 70% acrylic acid/10% malefic acid/20% ethyl acrylate.
~ The Av0 level of the above formula is 2.2%.
3 Pentaammineacetatocobalt(III) nitrate.prepared as described hereinbefore;
may be replaced by MnTACN.
The ADD's of the above dishwashing detergent composition examples are used to wash tea-stained cups, starch-soiled and spaghetti-soiled dishes, milk-soiled glasses, starch, cheese,.egg or babyfood- soiled flatware, and tomato-stained plastic spatulas by loading the soiled dishes in a domestic automatic dishwashing appliance and washing using either cold fill, 60oC peak; or uniformly 45-SOoC wash cycles with a product concentration of the exemplary compositions of from about 1,000 to about 5,000 ppm, with excellent results.
The following examples further illustrate phosphate built ADD compositions which contain a bleach/enzyme particle, but are not intended to be limiting thereof.
1 ~ All percentages noted are by weight of the finished compositions, other than the perborate (monohydrate) component, which is listed as Av0_ _2 3 Catalystl 0.008 0.004 SavinaseTM 12T -- 1.12 Protease D 0.9 --DuramylTM 1.5 0.75 STPP 31.0 30.0 Na2C03 20.0 30.5 Polymer3 4.0 --Perborate (Av0) 2.2 0.7 Dibenzoyl Peroxide 0.2 0.15 2 R Silicate (Si02) 8.0 3.5 Paraffin 0.5 0.5 Benzotriazole 0.3 0.15 PLURAFACT"s 2.0 0.75 Sodium Sulfate, Moisture -------Balance----------1 Pentaacnmineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N or polyacrylate/polymethacrylate copolymers.
In Compositions of Examples 2 and 3, respectively, the catalyst and enzymes are introduced into the compositions as 200-2400 micron composite particles which are prepared by spray coating, fluidized bed granulation, marumarizing, grilling or flaking/grinding operations. If desired, the protease and amylase enzymes may be separately formed into their respective catalystlenzyme composite particles, for reasons of stability, and these separate composites added to the compositions.
The following describes catalyst/enzyme particles (prepared by drum granulation) for use in the present invention compositions. For example ~, the catalyst is incorporated as part of the granule core, and for example 4 the catalyst is post added as a coating. The mean particle size is in the range from about 200 to 800 microns.
CatalystlEnzvme Particles for Examples 4 and 5 , l5 4 5 Core Cobalt Catalyst (PAC)- 0.3 Amylase, commercial 0.4 0.4 Fibrous Cellulose 2.0 2.0 PVP 1.0 1.0 Sodium Sulphate 93.3 93.3 Coating Titanium Dioxide 2.0 2.0 PEG 1.0 t.0 Cobalt Catalyst (PAC) 0.3 -Granular dishwashing detergents wherein Example 4 is a Compact product and Example 5 is a Regular/Fluffy product are as follows:
Composite Particle 1.5 0.75 SavinaseTM 12T 2.2 -Protease D -- 0.45 STPP 34.5 30.0 Na~C03 20.0 30.5 Acuso1480N 4.0 --Perborate(Av0) 2.2 0.7 Dibenzoyl Peroxide 0.2 0.15 5 2 R Silicate(Si02) 8.0 3:5 Paraffin -- 0.5 Benzotriazole -- 0.15 PlurafacTM -- 0.75 Sodium Sulphate, Moisture ---to balance----------Other,compositions herein are as follows:
EXAMPLES f,- 8 STPP 34.4 34.4 34.4 Na2C03 20.0 30.0 30.5 Polymer3 4.0 -- --Perborate (Av0) 2.2 I .0 0.7 Catatystl 0.008 0.004 0.004 SavinaseTM 6.OT -- 2.02 2.0' Protease D 0.9 -- --DuramylTM i .5 0.75 --TermamylT"~ b.OT -- -- 1.0 Dibenzoyl Peroxide (active) 0.8 0.6 0.4 2 R Silicate (Si02) 8.0 6.0 4.0 Nonionic Surfactant'4 2.0 1.5 1.2 Sodium Sulfate, Moisture ________~___ g~~ce ~___________ I Pentaainineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N.
4 PolyTergent SLF-18 from Olin Corporation.
In Compositions of Examples 6-8, respectively, the catalyst and enzymes are introduced into the final compositions as 200-2400 micron catalyst/enzyme composite particles which are prepared by spray coating, marumarizing, prilling or flaking/grinding operations. If desired, the protease and amylase enzymes may be separately formed into their respective catalyst/enzyme composite particles, for reasons of stability, and these separate composites added to the compositions.
S STPP 31.0 31.0 31.0 Na2C03 20.0 20.0 20.0 Polymer3 4.0 4.0 4.0 Perborate (Av0) 2.2 2.2 2.2 Catalystl 0.008 0.018 0.018 SavinaseTM 6.OT2 2.0 2.0 2.0 TermamyiTM 6.OT 1.0 1.0 1.0 TAED 2.0 -- --2 R Silicate (Si02) 8.0 8.0 8.0 Metasilicate -- -- ~ 2.5 Nonionic Surfaciant4 2.0 2.0 2.0 Sodium Sulfate, Moisture -------------- Balance -- ---- -----1 Pentaamineacetatocobalt (III) nitrate; may be replaced by MnTACN.
2 May be replaced by 0.45 Protease D.
3 Polyacrylate or Acusol 480N.
4 PolyTergent SLF-18 from Olin Corporation.
Any of the foregoing ADD compositions can be used in the conventional manner in an automatic dishwashing machine to cleanse dishware, glassware, cookingleating utensils, and the like.
Claims (8)
1. A granular automatic dishwashing detergent composition consisting essentially of:
(a) a metal-containing bleach catalyst in an amount sufficient to provide from 0.01 ppm to 10 ppm in an aqueous solution in an automatic dishwasher;
(b) from 0.5% to 30% by weight of sodium perborate monohydrate;
(c) from 15% to 50% by weight of a phosphate builder;
(d) from 15% to 50% by weight of a carbonate builder;
(e) from 0.25% to 4% by weight of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below 32°C.;
(f) from 0.001% to 6% by weight of a detersive enzyme selected from the group consisting of amylase, protease and mixtures thereof;
(g) from 1% to 50% by weight of a silicate;
(h) from 0% to 40% by weight of a sulfate filler;
(i) a perfume; and (j) a dye;
wherein a 1% aqueous solution or said automatic dishwashing composition has a pH of less than 11; the composition produces less than 2 inches of suds under normal use conditions; and said composition is in the form of a granule containing less than 7% by weight of free water.
(a) a metal-containing bleach catalyst in an amount sufficient to provide from 0.01 ppm to 10 ppm in an aqueous solution in an automatic dishwasher;
(b) from 0.5% to 30% by weight of sodium perborate monohydrate;
(c) from 15% to 50% by weight of a phosphate builder;
(d) from 15% to 50% by weight of a carbonate builder;
(e) from 0.25% to 4% by weight of a low foaming nonionic surfactant having a cloud point of a 1% solution in water of below 32°C.;
(f) from 0.001% to 6% by weight of a detersive enzyme selected from the group consisting of amylase, protease and mixtures thereof;
(g) from 1% to 50% by weight of a silicate;
(h) from 0% to 40% by weight of a sulfate filler;
(i) a perfume; and (j) a dye;
wherein a 1% aqueous solution or said automatic dishwashing composition has a pH of less than 11; the composition produces less than 2 inches of suds under normal use conditions; and said composition is in the form of a granule containing less than 7% by weight of free water.
2. The automatic dishwashing detergent composition according to claim 1 wherein the metal-containing bleach catalyst is selected from manganese-containing bleach catalysts, cobalt-containing bleach catalysts, and mixtures thereof.
3. The automatic dishwashing detergent composition according to claim 2 wherein the cobalt-containing bleach catalyst has the formula:
Co{(NH3)n M'm B'b Tt Qq Pp }Yy wherein cobalt is in the +3 oxidation state, n is an integer from 0 to 5; M' represents a monodentate ligand; m is an integer from 0 to 5; B' represents a bidentate ligand, b is an integer from 0 to 2; T' represents a tridentate ligand; t is 0 or 1; Q is a tetradentate ligand; q is 0 or 1; P is a pentadentate ligand, p is 0 or 1, and n+m+2b+4q+5p=6; Y is one or more counteranions present in a number y, where y is an integer from 1 to 3, to obtain a charge-balanced salt;
and wherein further at least one of the coordination sites attached to the cobalt is labile under automatic dishwashing use conditions and the remaining coordination sites stabilize the cobalt under automatic dishwashing conditions such that the reduction potential for cobalt (III) to cobalt (II) under alkaline conditions is less than 0.4 volts versus a normal hydrogen electrode.
Co{(NH3)n M'm B'b Tt Qq Pp }Yy wherein cobalt is in the +3 oxidation state, n is an integer from 0 to 5; M' represents a monodentate ligand; m is an integer from 0 to 5; B' represents a bidentate ligand, b is an integer from 0 to 2; T' represents a tridentate ligand; t is 0 or 1; Q is a tetradentate ligand; q is 0 or 1; P is a pentadentate ligand, p is 0 or 1, and n+m+2b+4q+5p=6; Y is one or more counteranions present in a number y, where y is an integer from 1 to 3, to obtain a charge-balanced salt;
and wherein further at least one of the coordination sites attached to the cobalt is labile under automatic dishwashing use conditions and the remaining coordination sites stabilize the cobalt under automatic dishwashing conditions such that the reduction potential for cobalt (III) to cobalt (II) under alkaline conditions is less than 0.4 volts versus a normal hydrogen electrode.
4. The automatic dishwashing detergent composition according to claim 2 wherein the bleach catalyst is selected from the group consisting of pentaarnineacetatocobalt (III) nitrate, MnTACN, and mixtures thereof.
5. The granular automatic dishwashing detergent composition according to claim 2 wherein the cobalt-containing bleach catalyst has the formula:
{Co(NH3)n (M)m (B)b }Ty wherein cobalt is in the +3 oxidation state; n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1; and when b=0, then m+n=6, and when b=1, then m=0 and n=4; and T is one or more counteranions present in a number y, wherein y is an integer to obtain a charge-balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M-1 s-1 at 25°C.
{Co(NH3)n (M)m (B)b }Ty wherein cobalt is in the +3 oxidation state; n is 4 or 5; M is one or more ligands coordinated to the cobalt by one site; B is a ligand coordinated to the cobalt by two sites; b is 0 or 1; and when b=0, then m+n=6, and when b=1, then m=0 and n=4; and T is one or more counteranions present in a number y, wherein y is an integer to obtain a charge-balanced salt; and wherein further said catalyst has a base hydrolysis rate constant of less than 0.23M-1 s-1 at 25°C.
6. The automatic dishwashing detergent composition according to claim 5 further comprising one or more bleach activators.
7. The automatic dishwashing detergent composition according to claim 6 wherein the bleach activator is TAED, benzoylcaprolactam, 4-nitrobenzoylcaprolactam, 3-chlorobenzoycaprolactam, benzenesulphonate, nonanoyloxybenzene-sulphonate, phenyl benzoate, decanoyloxybenzene-sulphonate, benzoylvalerolactam, octanoyloxybenzenesulphonate, quaternary substituted bleach activators, perhydrolyzable esters or mixtures thereof.
8. The granular automatic dishwashing composition according to claim 1 wherein detersive enzyme (f) is a mixture of one amylase enzyme and two protease enzymes.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/575,317 | 1995-12-20 | ||
US08/575,317 US5968881A (en) | 1995-02-02 | 1995-12-20 | Phosphate built automatic dishwashing compositions comprising catalysts |
CA 2240818 CA2240818C (en) | 1995-12-20 | 1996-12-13 | Phosphate built automatic dishwashing compositions comprising catalysts |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2240818 Division CA2240818C (en) | 1995-12-20 | 1996-12-13 | Phosphate built automatic dishwashing compositions comprising catalysts |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2546759A1 true CA2546759A1 (en) | 1997-06-26 |
Family
ID=36677022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002546759A Abandoned CA2546759A1 (en) | 1995-12-20 | 1996-12-13 | Low-foaming granular automatic diswashing detergent comprising metal-containing bleach catalyst |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2546759A1 (en) |
-
1996
- 1996-12-13 CA CA002546759A patent/CA2546759A1/en not_active Abandoned
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