CA2221470C - Method of removing mold from plastic bottles and mold removing additive - Google Patents
Method of removing mold from plastic bottles and mold removing additive Download PDFInfo
- Publication number
- CA2221470C CA2221470C CA002221470A CA2221470A CA2221470C CA 2221470 C CA2221470 C CA 2221470C CA 002221470 A CA002221470 A CA 002221470A CA 2221470 A CA2221470 A CA 2221470A CA 2221470 C CA2221470 C CA 2221470C
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- Prior art keywords
- surfactant
- sodium
- bottles
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Links
- 239000004033 plastic Substances 0.000 title claims abstract description 26
- 229920003023 plastic Polymers 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 15
- 239000000654 additive Substances 0.000 title description 10
- 230000000996 additive effect Effects 0.000 title description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 29
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 15
- 239000002738 chelating agent Substances 0.000 claims abstract description 12
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 11
- 239000003518 caustics Substances 0.000 claims abstract description 10
- 238000005336 cracking Methods 0.000 claims abstract description 10
- 239000010452 phosphate Substances 0.000 claims abstract description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 10
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 claims abstract description 9
- QGJDXUIYIUGQGO-UHFFFAOYSA-N 1-[2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoyl]pyrrolidine-2-carboxylic acid Chemical compound CC(C)(C)OC(=O)NC(C)C(=O)N1CCCC1C(O)=O QGJDXUIYIUGQGO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 21
- -1 olefin sulfonates Chemical class 0.000 claims description 13
- 235000021317 phosphate Nutrition 0.000 claims description 13
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000176 sodium gluconate Substances 0.000 claims description 8
- 235000012207 sodium gluconate Nutrition 0.000 claims description 8
- 229940005574 sodium gluconate Drugs 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 239000002736 nonionic surfactant Substances 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 150000001298 alcohols Chemical class 0.000 claims description 6
- 150000002191 fatty alcohols Chemical class 0.000 claims description 5
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 5
- OCUCCJIRFHNWBP-IYEMJOQQSA-L Copper gluconate Chemical class [Cu+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O OCUCCJIRFHNWBP-IYEMJOQQSA-L 0.000 claims description 4
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 4
- 150000008055 alkyl aryl sulfonates Chemical class 0.000 claims description 4
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 4
- SZHQPBJEOCHCKM-UHFFFAOYSA-N 2-phosphonobutane-1,2,4-tricarboxylic acid Chemical compound OC(=O)CCC(P(O)(O)=O)(C(O)=O)CC(O)=O SZHQPBJEOCHCKM-UHFFFAOYSA-N 0.000 claims description 3
- KIDJHPQACZGFTI-UHFFFAOYSA-N [6-[bis(phosphonomethyl)amino]hexyl-(phosphonomethyl)amino]methylphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCCCCCN(CP(O)(O)=O)CP(O)(O)=O KIDJHPQACZGFTI-UHFFFAOYSA-N 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000003945 anionic surfactant Substances 0.000 claims description 3
- 229940090960 diethylenetriamine pentamethylene phosphonic acid Drugs 0.000 claims description 3
- XQRLCLUYWUNEEH-UHFFFAOYSA-N diphosphonic acid Chemical compound OP(=O)OP(O)=O XQRLCLUYWUNEEH-UHFFFAOYSA-N 0.000 claims description 3
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 claims description 3
- 150000003871 sulfonates Chemical class 0.000 claims description 3
- TXPKUUXHNFRBPS-UHFFFAOYSA-N 3-(2-carboxyethylamino)propanoic acid Chemical group OC(=O)CCNCCC(O)=O TXPKUUXHNFRBPS-UHFFFAOYSA-N 0.000 claims description 2
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical group OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 2
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 2
- 239000004711 α-olefin Substances 0.000 claims description 2
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims 1
- YHAIUSTWZPMYGG-UHFFFAOYSA-L disodium;2,2-dioctyl-3-sulfobutanedioate Chemical compound [Na+].[Na+].CCCCCCCCC(C([O-])=O)(C(C([O-])=O)S(O)(=O)=O)CCCCCCCC YHAIUSTWZPMYGG-UHFFFAOYSA-L 0.000 claims 1
- 125000005612 glucoheptonate group Chemical group 0.000 claims 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 claims 1
- RYCLIXPGLDDLTM-UHFFFAOYSA-J tetrapotassium;phosphonato phosphate Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])(=O)OP([O-])([O-])=O RYCLIXPGLDDLTM-UHFFFAOYSA-J 0.000 claims 1
- 229920000388 Polyphosphate Polymers 0.000 abstract description 2
- 229920000515 polycarbonate Polymers 0.000 abstract description 2
- 239000004417 polycarbonate Substances 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 abstract description 2
- 239000001205 polyphosphate Substances 0.000 abstract description 2
- 235000011176 polyphosphates Nutrition 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 33
- 239000000243 solution Substances 0.000 description 24
- 238000005406 washing Methods 0.000 description 13
- 238000009472 formulation Methods 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000012669 liquid formulation Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- ZVXSESPJMKNIQA-YXMSTPNBSA-N Lys-Thr-Pro-Pro Chemical compound NCCCC[C@H](N)C(=O)N[C@@H]([C@H](O)C)C(=O)N1CCC[C@H]1C(=O)N1[C@H](C(O)=O)CCC1 ZVXSESPJMKNIQA-YXMSTPNBSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical compound [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 102000003886 Glycoproteins Human genes 0.000 description 1
- 108090000288 Glycoproteins Proteins 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical class OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 229920002257 Plurafac® Polymers 0.000 description 1
- 101710194948 Protein phosphatase PhpP Proteins 0.000 description 1
- 229920013807 TRITON DF-12 Polymers 0.000 description 1
- 229920013808 TRITON DF-16 Polymers 0.000 description 1
- 229920013809 TRITON DF-20 Polymers 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000005055 alkyl alkoxy group Chemical group 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 1
- 235000011180 diphosphates Nutrition 0.000 description 1
- 229960000878 docusate sodium Drugs 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229940050410 gluconate Drugs 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- GBHRVZIGDIUCJB-UHFFFAOYSA-N hydrogenphosphite Chemical class OP([O-])[O-] GBHRVZIGDIUCJB-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000013642 negative control Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- DIORMHZUUKOISG-UHFFFAOYSA-N sulfoformic acid Chemical compound OC(=O)S(O)(=O)=O DIORMHZUUKOISG-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/36—Organic compounds containing phosphorus
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/06—Phosphates, including polyphosphates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/18—Glass; Plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Detergent Compositions (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Mold removal from plastic bottles such as polyester and polycarbonate bottles is significantly enhanced by adding to a typical caustic soaking solution an effective amount of a complex polyphosphate such as sodium tripolyphosphate and a surfactant. The combination of the phosphate and the surfactant significantly enhances mold removal. Mold removal can be further enhanced by combining with the phosphate and surfactant either a phosphonate and/or a chelating agent such as sodium glucoheptonate. This combination signficantly improves mold removal, but does not increase stress cracking of the plastic bottle.
Description
Yal =
Method of Removing Mold From Plastic Bottles and Mold Removing Additive Backaround of the Invention In many countries, bottles such as soft drink bottles are repeatedly cleaned and reused. The used bottles are passed through a bottle-washing apparatus which cleans the bottle, permitting it to be refilled and reused. Both plastic and glass bottles are subject to reuse.
Due to the physical characteristics of glass versus plastic bottles, the two are treated somewhat differently. Glass bottles are subjected to a highly alkaline wash containing 2-411 sodium hydroxide at a temperature of generally 70 C or higher. This is quite effective in removing most soils.
One soil which is particularly difficult to remove is mold.
Mold tightly adheres to the surface of bottles, both plastic and glass, and is relatively difficult to remove. Mold can be removed from glass bottles by simply operating at temperatures above 60 C, which is typically done. But with plastic containers, this is not possible. At temperatures higher than 60 C, most plastic containers will shrink.
Further, higher temperatures and higher alkalinity promote stress cracking which is unsightly and eventually can cause the bottle to leak or break open. Certain surfactants also promote stress cracking. Other harsh chemicals such as bleaches will remove mold. But these would corrode the equipment and therefore are unacceptable. EDTA is currently used to enhance mold removal. However, this is not always totally effective.
Compounding the problem of mold removal is the fact that its mechanism of attachment to a surface is not completely understood. It is believed that a protein and/or a C 6428 (V) glycoprotein is involved in the attachment, but the exact chemical nature of this attachment, as well as the physical nature of this attachment, are not completely understood.
Suuunary of the Invention It is an object of the present invention to provide an additive for a bottle-washing apparatus which effectively removes mold from the surface of plastic articles such as bottles without destroying the plastic article.
More particularly, the present invention is premised upon the realization that an alkaline wash solution which includes an effective amount of a complex phosphate, in combination with a suitable surfactant, either nonionic or anionic, will effectively remove mold from plastic surfaces at temperatures less than 60 C. This, in turn, permits the removal of mold from the plastic surface without destruction of the plastic container.
More particularly, the present invention is premised on the realization that the removal of mold is enhanced by the further addition of an effective amount of a phosphonate which is also useful in the cleaning of the bottle. In a preferred embodiment, the bottle-washing solution will also include a chelating agent such as sodium gluconate, sodium glucoheptonate, or sodium boroheptonate. Although gluconates are considered to be less effective at milder alkalinities, it provides a significant improvement in mold removal in this system. These combined components provide an extremely effective bottle-washing solution which outperforms currently-used bottle washing formulations in the removal of mold from plastic surfaces. Further, the formulation of the present invention, even with the added surfactant, does not further promote stress cracking relative to commercially available formulations. Although formulated primarily for C 6428' (V) plastic containers, this formulation will also assist in removal of mold from glass containers as well.
The objects and advantages of the present invention will be further appreciated in light of the following detailed description and drawing description in which:
Brief Description of Drawing The Figure is a graph showing the test results of Example 2 demonstrating mold removal from bottles in a commercial bottle washing apparatus.
Detailed Description The present invention is a method and solution for cleaning reusable plastic bottles and is particularly directed at mold removal. The reusable plastic bottles cleaned according to the present invention can be formed from many different plastics. Most reusable plastic bottles are currently formed from polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polycarbonate. Basically any reusable plastic bottle which can be subjected to an alkaline wash is suitable for use in the present invention.
By way of background, bottle washing apparatuses generally include three or four sections. The bottles are introduced into the machine and supported throughout the washing process by individual holders or pockets. Bottles are initially directed to a prerinse section which is designed to remove large particles and labels. In this section water and residuals from the cleaning process are directed at the bottles as they are introduced into the machine.
Next, the bottles are conveyed to a cleaning or soaking section where they are soaked in a caustic solution at an C 6428 (V) elevated temperature, generally no higher than 60 C for plastic bottles such as PET bottles. After 7 to about 30 minutes (generally 9-11 minutes) in the soaking section the bottles are taken to a warm rinse and then to a final potable water rinse. The final rinse is then reused for the subsequent initial prerinse.
The cleaning or soaking solution is a caustic solution.
Generally this contains 0.5 to 5.00, and preferably 1.0 to 3.0%, sodium hydroxide for PET containers. This acts to clean the bottles and dissolve metals such as metal foils of the label and the closure rings. This caustic solution also, in combination with temperature and contact time, renders the bottles commercially sterile. However, at caustic concentrations greater than 3% stress cracking of the plastic bottles is excessive.
In addition to the caustic, the soaking solution will include an additive to enhance mold removal. The mold-removing additive is a combination of complex phosphates, surfactants, and preferably chelating agents, particularly gluconates and related agents, as well as threshold water conditioners such as the phosphonates. The additive itself is formed in a concentrated stable aqueous solution or a premixed powder which is formulated with the above components in a proportion to provide for effective use concentration of all the components when added.
Generally the soaking solution in the bottle washing apparatus, i.e., at use concentration, should have 1000 to 2500 ppm of the complex phosphates. Complex phosphates include the common polyphosphates. Particular phosphates which can be employed include sodium tripolyphosphate, potassium tripolyphosphate, sodium potassium tripolyphosphate, tetrapotassium, pyrophosphate, and tetrasodium pyrophosphate, as well as others.
Method of Removing Mold From Plastic Bottles and Mold Removing Additive Backaround of the Invention In many countries, bottles such as soft drink bottles are repeatedly cleaned and reused. The used bottles are passed through a bottle-washing apparatus which cleans the bottle, permitting it to be refilled and reused. Both plastic and glass bottles are subject to reuse.
Due to the physical characteristics of glass versus plastic bottles, the two are treated somewhat differently. Glass bottles are subjected to a highly alkaline wash containing 2-411 sodium hydroxide at a temperature of generally 70 C or higher. This is quite effective in removing most soils.
One soil which is particularly difficult to remove is mold.
Mold tightly adheres to the surface of bottles, both plastic and glass, and is relatively difficult to remove. Mold can be removed from glass bottles by simply operating at temperatures above 60 C, which is typically done. But with plastic containers, this is not possible. At temperatures higher than 60 C, most plastic containers will shrink.
Further, higher temperatures and higher alkalinity promote stress cracking which is unsightly and eventually can cause the bottle to leak or break open. Certain surfactants also promote stress cracking. Other harsh chemicals such as bleaches will remove mold. But these would corrode the equipment and therefore are unacceptable. EDTA is currently used to enhance mold removal. However, this is not always totally effective.
Compounding the problem of mold removal is the fact that its mechanism of attachment to a surface is not completely understood. It is believed that a protein and/or a C 6428 (V) glycoprotein is involved in the attachment, but the exact chemical nature of this attachment, as well as the physical nature of this attachment, are not completely understood.
Suuunary of the Invention It is an object of the present invention to provide an additive for a bottle-washing apparatus which effectively removes mold from the surface of plastic articles such as bottles without destroying the plastic article.
More particularly, the present invention is premised upon the realization that an alkaline wash solution which includes an effective amount of a complex phosphate, in combination with a suitable surfactant, either nonionic or anionic, will effectively remove mold from plastic surfaces at temperatures less than 60 C. This, in turn, permits the removal of mold from the plastic surface without destruction of the plastic container.
More particularly, the present invention is premised on the realization that the removal of mold is enhanced by the further addition of an effective amount of a phosphonate which is also useful in the cleaning of the bottle. In a preferred embodiment, the bottle-washing solution will also include a chelating agent such as sodium gluconate, sodium glucoheptonate, or sodium boroheptonate. Although gluconates are considered to be less effective at milder alkalinities, it provides a significant improvement in mold removal in this system. These combined components provide an extremely effective bottle-washing solution which outperforms currently-used bottle washing formulations in the removal of mold from plastic surfaces. Further, the formulation of the present invention, even with the added surfactant, does not further promote stress cracking relative to commercially available formulations. Although formulated primarily for C 6428' (V) plastic containers, this formulation will also assist in removal of mold from glass containers as well.
The objects and advantages of the present invention will be further appreciated in light of the following detailed description and drawing description in which:
Brief Description of Drawing The Figure is a graph showing the test results of Example 2 demonstrating mold removal from bottles in a commercial bottle washing apparatus.
Detailed Description The present invention is a method and solution for cleaning reusable plastic bottles and is particularly directed at mold removal. The reusable plastic bottles cleaned according to the present invention can be formed from many different plastics. Most reusable plastic bottles are currently formed from polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polycarbonate. Basically any reusable plastic bottle which can be subjected to an alkaline wash is suitable for use in the present invention.
By way of background, bottle washing apparatuses generally include three or four sections. The bottles are introduced into the machine and supported throughout the washing process by individual holders or pockets. Bottles are initially directed to a prerinse section which is designed to remove large particles and labels. In this section water and residuals from the cleaning process are directed at the bottles as they are introduced into the machine.
Next, the bottles are conveyed to a cleaning or soaking section where they are soaked in a caustic solution at an C 6428 (V) elevated temperature, generally no higher than 60 C for plastic bottles such as PET bottles. After 7 to about 30 minutes (generally 9-11 minutes) in the soaking section the bottles are taken to a warm rinse and then to a final potable water rinse. The final rinse is then reused for the subsequent initial prerinse.
The cleaning or soaking solution is a caustic solution.
Generally this contains 0.5 to 5.00, and preferably 1.0 to 3.0%, sodium hydroxide for PET containers. This acts to clean the bottles and dissolve metals such as metal foils of the label and the closure rings. This caustic solution also, in combination with temperature and contact time, renders the bottles commercially sterile. However, at caustic concentrations greater than 3% stress cracking of the plastic bottles is excessive.
In addition to the caustic, the soaking solution will include an additive to enhance mold removal. The mold-removing additive is a combination of complex phosphates, surfactants, and preferably chelating agents, particularly gluconates and related agents, as well as threshold water conditioners such as the phosphonates. The additive itself is formed in a concentrated stable aqueous solution or a premixed powder which is formulated with the above components in a proportion to provide for effective use concentration of all the components when added.
Generally the soaking solution in the bottle washing apparatus, i.e., at use concentration, should have 1000 to 2500 ppm of the complex phosphates. Complex phosphates include the common polyphosphates. Particular phosphates which can be employed include sodium tripolyphosphate, potassium tripolyphosphate, sodium potassium tripolyphosphate, tetrapotassium, pyrophosphate, and tetrasodium pyrophosphate, as well as others.
In addition to the complex phosphate, the wash solution must include an effective amount of a surfactant, either an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, or a mixture thereof. It is important that the surfactants be selected so that they do not promote stress cracking of the plastic bottles. The most effective nonionic surfactants are the polyalkoxylated fatty alcohols and the polyethoxylated straight chain alcohols. These are also preferred since they contribute to foam control.
Commercially available alkoxylated alcohol surfactants include Makon" NF 12, Plurafac" LF 221, Plurafac- LF 223, PlurafacTM LF 431, PolytergentTa SLF18, and TritonT" DF12, a modified polyethoxylated alcohol. Other suitable nonionics include alkyl polyglycosides such as TritonT" BG10, Triton"
CGIO, and EO - P0 block copolymers such as IndustrolT" N-3.
Suitable anionics include sodium C14 - C16 alpha olef in sulfonates such as BiotergeTM AS-40, alkyl aryl sulfonates, carboxylated alcohols such as PolytergentTm CSI, alkali metal salts of phosphate esters such as TritonT" H66, alkali metal alkanoates such as Monatrope" 1250, fatty alcohol polyglycol ether carboxylic acids such as AkypoTy LF4, dioctylsulfosuccinate such as MonawetT" M070, modified ethoxylates such as MonaTm NF 10 and Triton- DF 20, and alkali metal xylene sulfonates such as EltesolT" PX93.
Suitable amphoterics include alkyl and alkyl alkoxy iminodiproprionates such as lauryl iminodiproprionate and isodecyloxypropyl iminodiproprionate sold under the trademark Alkali surfactant.
C 6428 (V) CA 02221470 1997-11-19 Generally 200-1000 ppm surfactant will be used in the soaking solution. The upper limit is determined by economics.
Concentrations greater than 1000 ppm provide little added benefit. A blend of surfactants may be preferred to reduce stress cracking and improve efficiency.
In addition to the phosphate and surfactant, the formulation optionally includes 500-1000 ppm of an organic phosphonate.
Typically used organophosphonates include aminotrimethylene phosphonic acid, 1-hydroxyethylene (1,1 diphosphonic acid), hexamethylenediaminetetramethylene phosphonic acid, diethylenetriaminepentamethylene phosphonic acid, and phosphonobutanetricarboxylic acid. These assist not only in mold removal, but also carry over to the rinse section of the bottle washer to provide threshold water conditioning in that section, reducing scale.
Finally, the present invention can also include one or more chelating agents. Suitable chelating agents are the gluconates and comparable compositions. Particular chelating agents include sodium gluconate or gluconic acid, sodium glucoheptonate, and sodium boroheptonate. These should be present in the wash solution at a concentration of from 500 ppm to 2000 ppm.
C 6428 (V) The concentrated formulation can be stated in terms of a ratio of parts by weight actives. The mold removing composition of the present invention will generally include from 10 to 25 parts by weight of the complex phosphate, 2 to 10 parts by weight of the surfactant, and optionally but preferably 5 to 10 parts by weight of the phosphonate, and 5 to 20 parts by weight of the chelating agent, which is preferably sodium gluconate. Said surfactant is desirably either an anionic surfactant selected from alkylaryl sulfonates, C14-C16 alpha olefin sulfonates and alkyl sulfosuccinates, or a nonionic surfactant selected from polyalkoxylated fatty alcohols and polyethoxylated straight chain alcohols. Most preferred surfactant for use in said composition is iminodipropionate. If said composition is formulated as a liquid, it will also include an amount of caustic liquid to maintain an alkaline pH. The balance of the product would then be water. Generally, it is desirable to have as high an actives content as possible. With the present formulation, an actives content of 40o to 50o can be achieved.
Table 1 shows three different liquid formulations of the present invention. With liquid formulations, each of the individual components is simply combined with water. The order of addition is not significant. These are blended until a stable solution is formed.
Commercially available alkoxylated alcohol surfactants include Makon" NF 12, Plurafac" LF 221, Plurafac- LF 223, PlurafacTM LF 431, PolytergentTa SLF18, and TritonT" DF12, a modified polyethoxylated alcohol. Other suitable nonionics include alkyl polyglycosides such as TritonT" BG10, Triton"
CGIO, and EO - P0 block copolymers such as IndustrolT" N-3.
Suitable anionics include sodium C14 - C16 alpha olef in sulfonates such as BiotergeTM AS-40, alkyl aryl sulfonates, carboxylated alcohols such as PolytergentTm CSI, alkali metal salts of phosphate esters such as TritonT" H66, alkali metal alkanoates such as Monatrope" 1250, fatty alcohol polyglycol ether carboxylic acids such as AkypoTy LF4, dioctylsulfosuccinate such as MonawetT" M070, modified ethoxylates such as MonaTm NF 10 and Triton- DF 20, and alkali metal xylene sulfonates such as EltesolT" PX93.
Suitable amphoterics include alkyl and alkyl alkoxy iminodiproprionates such as lauryl iminodiproprionate and isodecyloxypropyl iminodiproprionate sold under the trademark Alkali surfactant.
C 6428 (V) CA 02221470 1997-11-19 Generally 200-1000 ppm surfactant will be used in the soaking solution. The upper limit is determined by economics.
Concentrations greater than 1000 ppm provide little added benefit. A blend of surfactants may be preferred to reduce stress cracking and improve efficiency.
In addition to the phosphate and surfactant, the formulation optionally includes 500-1000 ppm of an organic phosphonate.
Typically used organophosphonates include aminotrimethylene phosphonic acid, 1-hydroxyethylene (1,1 diphosphonic acid), hexamethylenediaminetetramethylene phosphonic acid, diethylenetriaminepentamethylene phosphonic acid, and phosphonobutanetricarboxylic acid. These assist not only in mold removal, but also carry over to the rinse section of the bottle washer to provide threshold water conditioning in that section, reducing scale.
Finally, the present invention can also include one or more chelating agents. Suitable chelating agents are the gluconates and comparable compositions. Particular chelating agents include sodium gluconate or gluconic acid, sodium glucoheptonate, and sodium boroheptonate. These should be present in the wash solution at a concentration of from 500 ppm to 2000 ppm.
C 6428 (V) The concentrated formulation can be stated in terms of a ratio of parts by weight actives. The mold removing composition of the present invention will generally include from 10 to 25 parts by weight of the complex phosphate, 2 to 10 parts by weight of the surfactant, and optionally but preferably 5 to 10 parts by weight of the phosphonate, and 5 to 20 parts by weight of the chelating agent, which is preferably sodium gluconate. Said surfactant is desirably either an anionic surfactant selected from alkylaryl sulfonates, C14-C16 alpha olefin sulfonates and alkyl sulfosuccinates, or a nonionic surfactant selected from polyalkoxylated fatty alcohols and polyethoxylated straight chain alcohols. Most preferred surfactant for use in said composition is iminodipropionate. If said composition is formulated as a liquid, it will also include an amount of caustic liquid to maintain an alkaline pH. The balance of the product would then be water. Generally, it is desirable to have as high an actives content as possible. With the present formulation, an actives content of 40o to 50o can be achieved.
Table 1 shows three different liquid formulations of the present invention. With liquid formulations, each of the individual components is simply combined with water. The order of addition is not significant. These are blended until a stable solution is formed.
Table 1 Raw Materials Formula 1 Formula 2 Formula 3 Soft Water 50.87 51.07 53.24 Sodium Gluconate 7.0 7.0 7.0 DequestT" 2000 3.0 3.0 3.0 Caustic Liquid 50% 2.0 2.0 2.0 KTPP Liquid 50 27.13 27.13 27.13 PlurafacTM LF221 1.0 0.32 (Nonionic 95%) (0.95) (0.30) PlurafacTM LF223 1.0 0.31 (Nonionic 98%) (0.98) (0.30) TritonT" BG 10 (Nonionic 70%) AkypoT" LF4 (Anionic 2.0 2.0 2.0 900) (1.8) (1.8) (1.8) EltesolT" PX93 7.0 6.8 5.0 An amount of the concentrated composition is added to the soaking solution to provide an acceptable level of actives in 30 the soaking solution. Generally, the use concentration will be 0.5 to 1.501 with 1.25o preferred.
The present invention is illustrated by way of the following non-limiting examples showing preferred methods of practicing 35 the invention.
C 6428 (V) In order to test the bottle washing composition of the present invention, and to compare this with commercially-available additives, actual consumer bottles containing mold colonies were collected. Approximately 50% of the moldy bottles had greater than 10 mold colonies. These were then passed through a bottle washing apparatus under identical conditions with different standard soaking solutions and mold removal results were compared. Initially, 2.8% sodium hydroxide was used by itself. This cleaned 360 of the bottles, but left 260 of the bottles with greater than 10 mold colonies. Two commercially available products were tested, each with 2.801 NaOH and a commercially available additive. These cleaned 46o and 54% of the bottles, respectively, both leaving 24% with greater than 10 mold colonies. 0.25% w/v sodium tripolyphosphate (1720 ppm) was then added to the solution containing the commercially available product. This, in turn, cleaned 56% of the bottles and left 12% with greater than 10 mold colonies. To this solution was then added 0.02% w/v surfactant (200 ppm alkoxylated alcohol). With this combined solution of sodium hydroxide, sodium tripolyphosphate and surfactant, 60% of the bottles were cleaned leaving only 6% of the bottles with greater than 10 mold colonies.
C 6428 (V) In a second study, consumer bottles containing mold colonies were collected and separated into 7 groups. The Figure is a graph depicting the seven groups. The first group was not 5 washed and contained 23o bottles with greater than 10 mold colonies (negative control). A second group was sent through a bottle washing solution with 2.8% sodium hydroxide (standard control). This cleaned 42% of the bottles and left 23% with greater than 10 mold colonies. Two commercially 10 available products listed at RPB and MR were again tested with 2.8% NaOH. These cleaned 51% and 46% of the bottles, respectively, leaving greater than 10 mold colonies in 270 and 18%, respectively. Formula 3, listed as "X" in the Figure, was then added to the sodium hydroxide at 0.4%
concentration. This resulted in 46a of the bottles being cleaned with 17a of the bottles left with greater than 10 mold colonies. The concentration was then increased to 0.80, resulting in 51% of the bottles being cleaned and 21%
containing more than 10 mold colonies. Finally, at 1.250 concentration, 65% of the bottles were cleaned, with 13% of the bottles having more than 10 mold counts.
These tests were all relatively severe and they were not expected to achieve 100o cleaning or 100% mold removal. The results shown by Formula 3 were considered significantly better than commercially available products, particularly at the 1.25% concentration level.
These test results indicate that the sodium tripolyphosphate, in combination with the nonionic surfactant, is particularly effective at removing mold, and that the Formula 3 is a significant improvement over the combination of sodium tripolyphosphate and nonionic surfactant by itself. Further, test results indicated that the addition of Formula 3, in spite of the use of the surfactant, promoted less stress C 642 8(V) CA 02221470 1997-11-19 cracking than other commercial additives. Thus, the present invention provides better mold removal and promotes less stress cracking than commercially available products.
Exemplary dry formulations which are useful in assisting mold removal are listed below, as well as an indication of mold removal efficacy in laboratory studies:
POWDERS
Material: Weight Percent STPP, granular 45.00 SKTP, granular 63.00 Sodium gluconate 25.00 25.00 Dequest 2016D 6.00 6.00 Makon NF 12 6.00 Soda Ash 15.00 Poly Tergent SLF-18 6.00 Poly Tergent CS-1 3.00 Mold Removal 90-10001 10001 W/w additives 0.40 0.401 NaOH 2.80a 1.50o Other exemplary liquid formulations are listed below.
C 6428 (V) LIQUIDS
Material: ----------------- Weight Percent----------------Water, soft 74.75 74.50 68.50 49.75 68.10 70.30 70.50 69.20 KTPP, 60% 24.00 24.00 30.00 40.00 solution Sodium 7.00 7.00 7.0 5.0 gluconate Triton DF12 0.25 0.25 Triton DF 16 0.25 Alkali 1.00 1.25 1.25 Surfactant Sodium Xylene 10.00 Sulfonate, 40% solution Mona NF 10 0.25 Inustrol N-3 1.50 NaOH, 50% 2.00 2.00 2.0 4.0 liquor Dequest 2000 3.00 3.00 3.0 3.30 SKTP, 12.00 12.00 12.00 12.50 granular PolyTergent 1.40 2.00 1.00 PolyTergent 3.00 2.00 3.00 Makon NF-12 Monatrope Alkenyl 3.40 2.30 3.50 2.00 Carboxy Sulfonate Use at t v/v 1.70 1.70 1.40 1.00 0.40 1.00 0.40 1.50 % mold 90- 100 100 100 90-removal 100 100 % NaOH 2.80 1.5 1.50 1.50 Each of these significatly enhance mold removal in an alkaline bottle washing solution.
The present invention is illustrated by way of the following non-limiting examples showing preferred methods of practicing 35 the invention.
C 6428 (V) In order to test the bottle washing composition of the present invention, and to compare this with commercially-available additives, actual consumer bottles containing mold colonies were collected. Approximately 50% of the moldy bottles had greater than 10 mold colonies. These were then passed through a bottle washing apparatus under identical conditions with different standard soaking solutions and mold removal results were compared. Initially, 2.8% sodium hydroxide was used by itself. This cleaned 360 of the bottles, but left 260 of the bottles with greater than 10 mold colonies. Two commercially available products were tested, each with 2.801 NaOH and a commercially available additive. These cleaned 46o and 54% of the bottles, respectively, both leaving 24% with greater than 10 mold colonies. 0.25% w/v sodium tripolyphosphate (1720 ppm) was then added to the solution containing the commercially available product. This, in turn, cleaned 56% of the bottles and left 12% with greater than 10 mold colonies. To this solution was then added 0.02% w/v surfactant (200 ppm alkoxylated alcohol). With this combined solution of sodium hydroxide, sodium tripolyphosphate and surfactant, 60% of the bottles were cleaned leaving only 6% of the bottles with greater than 10 mold colonies.
C 6428 (V) In a second study, consumer bottles containing mold colonies were collected and separated into 7 groups. The Figure is a graph depicting the seven groups. The first group was not 5 washed and contained 23o bottles with greater than 10 mold colonies (negative control). A second group was sent through a bottle washing solution with 2.8% sodium hydroxide (standard control). This cleaned 42% of the bottles and left 23% with greater than 10 mold colonies. Two commercially 10 available products listed at RPB and MR were again tested with 2.8% NaOH. These cleaned 51% and 46% of the bottles, respectively, leaving greater than 10 mold colonies in 270 and 18%, respectively. Formula 3, listed as "X" in the Figure, was then added to the sodium hydroxide at 0.4%
concentration. This resulted in 46a of the bottles being cleaned with 17a of the bottles left with greater than 10 mold colonies. The concentration was then increased to 0.80, resulting in 51% of the bottles being cleaned and 21%
containing more than 10 mold colonies. Finally, at 1.250 concentration, 65% of the bottles were cleaned, with 13% of the bottles having more than 10 mold counts.
These tests were all relatively severe and they were not expected to achieve 100o cleaning or 100% mold removal. The results shown by Formula 3 were considered significantly better than commercially available products, particularly at the 1.25% concentration level.
These test results indicate that the sodium tripolyphosphate, in combination with the nonionic surfactant, is particularly effective at removing mold, and that the Formula 3 is a significant improvement over the combination of sodium tripolyphosphate and nonionic surfactant by itself. Further, test results indicated that the addition of Formula 3, in spite of the use of the surfactant, promoted less stress C 642 8(V) CA 02221470 1997-11-19 cracking than other commercial additives. Thus, the present invention provides better mold removal and promotes less stress cracking than commercially available products.
Exemplary dry formulations which are useful in assisting mold removal are listed below, as well as an indication of mold removal efficacy in laboratory studies:
POWDERS
Material: Weight Percent STPP, granular 45.00 SKTP, granular 63.00 Sodium gluconate 25.00 25.00 Dequest 2016D 6.00 6.00 Makon NF 12 6.00 Soda Ash 15.00 Poly Tergent SLF-18 6.00 Poly Tergent CS-1 3.00 Mold Removal 90-10001 10001 W/w additives 0.40 0.401 NaOH 2.80a 1.50o Other exemplary liquid formulations are listed below.
C 6428 (V) LIQUIDS
Material: ----------------- Weight Percent----------------Water, soft 74.75 74.50 68.50 49.75 68.10 70.30 70.50 69.20 KTPP, 60% 24.00 24.00 30.00 40.00 solution Sodium 7.00 7.00 7.0 5.0 gluconate Triton DF12 0.25 0.25 Triton DF 16 0.25 Alkali 1.00 1.25 1.25 Surfactant Sodium Xylene 10.00 Sulfonate, 40% solution Mona NF 10 0.25 Inustrol N-3 1.50 NaOH, 50% 2.00 2.00 2.0 4.0 liquor Dequest 2000 3.00 3.00 3.0 3.30 SKTP, 12.00 12.00 12.00 12.50 granular PolyTergent 1.40 2.00 1.00 PolyTergent 3.00 2.00 3.00 Makon NF-12 Monatrope Alkenyl 3.40 2.30 3.50 2.00 Carboxy Sulfonate Use at t v/v 1.70 1.70 1.40 1.00 0.40 1.00 0.40 1.50 % mold 90- 100 100 100 90-removal 100 100 % NaOH 2.80 1.5 1.50 1.50 Each of these significatly enhance mold removal in an alkaline bottle washing solution.
Claims (16)
1. A method of removing mold colonies from plastic bottles comprising treating said bottles with a solution, said solution containing a concentration of caustic effective to clean said bottles, in combination with an amount of a complex phosphate and surfactant, said amount being effective to achieve enhanced mold removal at a temperature less than 60°C without promoting stress cracking.
2. The method claimed in claim 1, wherein said complex phosphate is selected from the group consisting of sodium tripolyphosphate, potassium tripolyphosphate, sodium potassium tripolyphosphate, tetrapotassium pyrophosphate, and tetrasodium pyrophosphate.
3. The method claimed in claim 2, wherein said solution comprises from 1000 to 2500 ppm of said complex phosphates.
4. The method claimed in claim 1, wherein the solution comprises from 200 ppm to 1000 ppm of said surfactant.
5. The method claimed in claim 4, wherein said surfactant is selected from the group consisting of polyalkoxylated fatty alcohols, polyethoxylated straight chain alcohols, alkyl aryl sulfonates, C14-16 alpha olefin sulfonates, and sodium dioctylsulfosuccinate.
6. The method claimed in claim 1, wherein said solution further comprises from 500 to 1000 ppm of an organic phosphonate.
7. The method claimed in claim 6, wherein said organic phosphonate is selected from the group consisting of amino trimethylene phosphonic acid, 1-hydroxyethylene(1,1 diphosphonic acid), hexamethylenediaminetetramethylene phosphonic acid, diethylenetriaminepentamethylene phosphonic acid, and phosphonobutanetricarboxylic acid.
8. The method claimed in claim 1, wherein said solution further includes a chelating agent selected from the group consisting of sodium gluconate, sodium glucoheptonate, and sodium boroheptonate.
9. The method claimed in claim 8, wherein said chelating agent is present in an amount from 500 to 2000 ppm.
10. A method of removing mold from plastic bottles comprising soaking said bottles in a caustic solution at a temperature less than 60°C, wherein said solution comprises from:
1000 to 2500 ppm complex phosphate;
200 to 1000 ppm surfactant selected from the group consisting of nonionic and anionic surfactants;
500 to 1000 ppm organic phosphonate;
500 to 2000 ppm of a chelating agent selected from a group consisting of sodium gluconate, sodium glucoheptonate, and sodium boroheptonate.
1000 to 2500 ppm complex phosphate;
200 to 1000 ppm surfactant selected from the group consisting of nonionic and anionic surfactants;
500 to 1000 ppm organic phosphonate;
500 to 2000 ppm of a chelating agent selected from a group consisting of sodium gluconate, sodium glucoheptonate, and sodium boroheptonate.
11. A mold removal agent for use with an alkali solution comprising:
to 25 parts by weight of a complex phosphate;
2 to 10 parts by weight of a surfactant;
5 to 10 parts by weight of an organic phosphonate;
5 to 20 parts by weight of a chelating agent selected from the group consisting of gluconates, glucoheptonates, or boroheptonates, said parts by weight provided on an actives basis, the balance being water.
to 25 parts by weight of a complex phosphate;
2 to 10 parts by weight of a surfactant;
5 to 10 parts by weight of an organic phosphonate;
5 to 20 parts by weight of a chelating agent selected from the group consisting of gluconates, glucoheptonates, or boroheptonates, said parts by weight provided on an actives basis, the balance being water.
12. The composition claimed in claim 11 wherein said organic phosphonate is selected from the group consisting of amino trimethylene phosphonic acid and 1-hydroxyethylene (1,1 diphosphonic acid), hexamethylenediaminetetramethylene phosphonic acid, diethylenetriaminepentamethylene phosphonic acid, and phosphonobutanetricarboxylic acid.
13. The composition claimed in claim 11 wherein said chelating agent is sodium gluconate.
14. The composition claimed in claim 11 wherein said surfactant is selected from the group consisting of alkylaryl sulfonates, C14-16alpha olefin sulfonates, and alkyl sulfosuccinates.
15. The composition claimed in claim 11 wherein said surfactant is a nonionic surfactant selected from the group consisting of polyalkoxylated fatty alcohols and polyethoxylated straight chain alcohols.
16. The composition claimed in claim 11 wherein said surfactant is an iminodipropionate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US75603496A | 1996-11-26 | 1996-11-26 | |
US08/756034 | 1996-11-26 |
Publications (2)
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CA2221470A1 CA2221470A1 (en) | 1998-05-26 |
CA2221470C true CA2221470C (en) | 2008-08-12 |
Family
ID=25041755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA002221470A Expired - Fee Related CA2221470C (en) | 1996-11-26 | 1997-11-19 | Method of removing mold from plastic bottles and mold removing additive |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0844301B1 (en) |
CA (1) | CA2221470C (en) |
DE (1) | DE69720143T2 (en) |
DK (1) | DK0844301T3 (en) |
ES (1) | ES2196256T3 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US6362149B1 (en) | 2000-08-03 | 2002-03-26 | Ecolab Inc. | Plastics compatible detergent composition and method of cleaning plastics comprising reverse polyoxyalkylene block co-polymer |
US6835702B2 (en) | 2000-11-07 | 2004-12-28 | Ecolab Inc. | Compositions and methods for mitigating corrosion of applied color designs |
WO2002038715A2 (en) * | 2000-11-07 | 2002-05-16 | Ecolab Inc. | Cleaning compositions and cleaning methods for mitigating corrosion of applied color designs |
WO2004027001A1 (en) * | 2002-09-18 | 2004-04-01 | Ecolab Inc. | Additive for use in bottle washing compositions additive |
CN101659521B (en) * | 2004-11-03 | 2013-07-10 | 迪瓦西公司 | Method of cleaning containers for recycling |
DE102007022110A1 (en) | 2007-05-11 | 2008-11-13 | Edmund Bromm | Killing and removal of mold and spores on surfaces and walls of buildings, furniture, wood and plastic surfaces and textiles, comprises foaming chemical agent for combating mold, and applying the agent on the surface by foaming device |
EP3500657A1 (en) | 2016-08-16 | 2019-06-26 | Diversey, Inc. | A composition for aesthetic improvement of food and beverage containers and methods thereof |
Family Cites Families (3)
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DE1937031A1 (en) * | 1968-07-22 | 1970-01-22 | Monsanto Co | Inhibitors, washing preparations, their solutions and application methods |
JPS61118499A (en) * | 1984-11-14 | 1986-06-05 | 株式会社 ネオス | Cleaning agent for spray cleaning |
JPH07116474B2 (en) * | 1993-06-11 | 1995-12-13 | ティーポール株式会社 | High-concentration alkaline liquid detergent composition and method for producing the same |
-
1997
- 1997-11-12 EP EP97203528A patent/EP0844301B1/en not_active Expired - Lifetime
- 1997-11-12 DK DK97203528T patent/DK0844301T3/en active
- 1997-11-12 ES ES97203528T patent/ES2196256T3/en not_active Expired - Lifetime
- 1997-11-12 DE DE69720143T patent/DE69720143T2/en not_active Expired - Lifetime
- 1997-11-19 CA CA002221470A patent/CA2221470C/en not_active Expired - Fee Related
Also Published As
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DK0844301T3 (en) | 2003-07-21 |
CA2221470A1 (en) | 1998-05-26 |
DE69720143D1 (en) | 2003-04-30 |
EP0844301B1 (en) | 2003-03-26 |
DE69720143T2 (en) | 2003-09-11 |
EP0844301A2 (en) | 1998-05-27 |
ES2196256T3 (en) | 2003-12-16 |
EP0844301A3 (en) | 1999-03-03 |
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