CA2029262C - Bleaching composition - Google Patents
Bleaching compositionInfo
- Publication number
- CA2029262C CA2029262C CA002029262A CA2029262A CA2029262C CA 2029262 C CA2029262 C CA 2029262C CA 002029262 A CA002029262 A CA 002029262A CA 2029262 A CA2029262 A CA 2029262A CA 2029262 C CA2029262 C CA 2029262C
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- Prior art keywords
- weight
- sodium
- bleach
- bleaching composition
- composition
- 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.)
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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
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/10—Carbonates ; Bicarbonates
-
- 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
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3902—Organic or inorganic per-compounds combined with specific additives
- C11D3/3905—Bleach activators or bleach catalysts
- C11D3/3907—Organic compounds
-
- 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
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3942—Inorganic per-compounds
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (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)
- Detergent Compositions (AREA)
Abstract
A stable and highly effective bleaching composition comprising (a) from 10% to 90%, preferably from 30% to 85% by weight of sodium percarbonate; (b) from 4% to 40%, preferably from 5% to 30% by weight of a bleach activator; and (c) from 5% to 85%, preferably from 10%
to 70% by weight of an alkali metal bicarbonate, sesquicarbonate or dihydrogen orthophosphate, is disclosed. The composition can be used for admixing with a detergent composition or, preferably, for use as a bleach additive. Preferred compositions contain sodium bicarbonate and tetraacetyl ethylene diamine.
to 70% by weight of an alkali metal bicarbonate, sesquicarbonate or dihydrogen orthophosphate, is disclosed. The composition can be used for admixing with a detergent composition or, preferably, for use as a bleach additive. Preferred compositions contain sodium bicarbonate and tetraacetyl ethylene diamine.
Description
`- 2029262 C 7209 (R) BLEACHING COMPOSITION
This invention relates to a bleaching composition comprising essentially sodium percarbonate as the persalt and a bleach activator for said persalt, which composition can be used, as desired, for admixing with a detergent composition or, preferably, as a bleach additive to a wash liquor for improving the bleaching action of said wash liquor during the wash, particularly in the lower temperature region of from about 20C to 60C.
The term "bleach activator" used herein refers to the broad class of reactive organic compounds which in alkaline solutions containing a source of hydrogen peroxide, e.g. a persalt, will generate the corresponding peroxyacid, which, unlike the persalt or hydrogen peroxide, is an effective oxidising bleach at low temperatures. These compounds are therefore also referred to in the art as peroxyacid bleach precursors, of which N,N,N',N'-tetraacetyl ethylene diamine (TAED), tetraacetyl glycoluril (TAGU), sodium acetoxybenzene sulphonate (SABS), sodium nonanoyloxybenzene sulphonate (SNOBS) and sodium benzoyloxybenzene sulphonate (SBOBS) are only a few typical examples in addition to the many other bleach precursor compounds described in literature, for example US Patents 1,246,339; 3,332,882;
4,128,494; 4,412,934; 4,675,393 and 4,751,015; GB Patent 1,382,594; EP-A-018S553, EP-A-170386, EP-A-0174132; EP-A-0120591; EP-A-0284292; EP-A-0303520; EP-A-0331229 and EP-A-0332294.
Sodium perborate mono- or tetrahydrate is currently the most widely used persalt bleaching agent in and with laundry detergent compositions. Bleaching compositions for use as a bleach additive comprising essentially C 7209 (R) 2029~62 sodium perborate mono- or tetra~ydrate, TAED and urea have also been proposed and described in EP-A-0288170.
These compositions containing sodium perborate are relatively stable and relatively easy to formulate.
Sodium perborate, however, is a boron compound, which has been criticized on environmental grounds.
In a move to "greenern products, the invention makes use of the more environmentally acceptable persalt sodium carbonate perhydrate (Na2C03.1~H202), commonly known as sodium percarbonate. Use of sodium percarbonate instead of sodium perborate, however, cannot be a matter of simple substitution. Unlike sodium perborate, sodium percarbonate is substantially less stable.
Japanese Patent Application JP-A-54-163906, published December 27, 1979, discloses a detergent bleach composition comprising 20% by weight of sodium percarbonate, 40% by weight of heat-treated sodium bicarbonate and 3% by weight of a bleach activator. In order to improve stability it is essential, according to this reference, that 1) the sodium percarbonate used must have been subjected to a heat treatment at a temperature of about 70-C-110C for 10-120 minutes, and that 2) the composition should contain a substantial amount of an acidic compound selected from succinic acid, citric acid and maleic acid.
Another important aspect of stability problems encountered with compositions containing higher levels of sodium percarbonate and a bleach activator is that which relates to the self-heating risk in factory handling, particularly if the product gets warm.
Various means have been proposed for stabilising or at least improving the stability of sodium percarbonate ~E
C 7209 (R) se, for example by coating it with a borate-containing composition as described in GB Patent 2,123,404.
These so-called stabilised percarbonates, however, are still unsatisfactory in terms of self-heating risk when used in a bleaching composition comprising a bleach activator.
According to the invention there is now provided a stable and highly effective bleaching composition comprising essentially :
(a) from 10% to 90% by weight of sodium percarbonate;
(b) at least 4% to 40% by weight of a bleach activator; and (c) from 5% to 85% by weight of an alkali metal bicarbonate, an alkali metal sesquicarbonate or an alkali metal dihydrogen orthophosphate, wherein the ratio by weight of component (a) to (b) is not less than 4:5 and the ratio by weight of component (c) to (b) is not less than 5:4, with the proviso that, if component (b) is present at a level of more than 8~, the amount of component (c) should be at least 20%.
The sodium percarbonate used in the present invention need not have been subjected to a heat treatment.
Use of the so-called stabilised percarbonates in the composition of the invention is possible but appears to result only in a marginal improvement.
Hence, the great advantage of the present invention is that a satisfactorily stable bleaching composition can be formulated with untreated, substantially unstabilised sodium percarbonate as manufactured.
20292~2 C 7209 (R) It is also of note that the present invention does not require the presence of acidic compounds in the stated amounts as suggested in the above Japanese reference.
Preferred compositions are therefore substantially free of succinic acid, citric acid or maleic acid.
The alkali metal salts used as component (c) are ' preferably the sodium salts, i.e. sodium bicarbonate, sodium sesquicarbonate and sodium dihydrogen orthophosphate (NaH2P04.2H20), the sodium bi- or sesqui-carbonates being particularly preferred as being non-phosphorus. Besides, the presence of sodium bicarbonate does not appear to influence the bleaching performance of the composition to any significant extent over the dosage range of interest, except for the dilution effect.
Apart from the above components, the bleaching composition of the invention may additionally contain sodium carbonate, as partial replacement for sodium bicarbonate. It has been found that sodium carbonate used at a level up to equal the amount of sodium bicarbonate does not affect the stability properties of the composition. Though not essential, the composition of the invention may further contain minor amounts of any known ingredients normally used in detergent or bleach compositions up to a level of about 10%, preferably not more than 5% by weight as desired, so long as their presence does not affect the stability properties of the composition.
Accordingly, in a preferred embodiment the composition is a fairly concentrated bleaching composition comprising essentially :
a) from 30% to 85% by weight of sodium percarbonate;
202926~ C 7209 (R) b) from 5% to 30% by weight of a bleach activator;
c) from 10% to 70% by weight of sodium bicarbonate; and d) from 0% to 35% by weight of sodium carbonate.
To this composition, for example, about 1% by weight of coloured detergent base powder speckles may be added for the purpose of product identification. Preferred speckles are, for example, blue- or green-coloured sodium carbonate particles.
Specifically preferred are those compositions which combine optimal stability with optimal performance when used as a bleach additive, comprising essentially :
(a) from 40% to 60% by weight of sodium percarbonate;
(b) from 12% to 25% by weight of bleach activator;
(c) from 20% to 50% by weight of sodium bicarbonate; and (d) from 0% to 15% by weight of sodium carbonate.
The bleach activator As explained before, any bleach activator from the broad class of peroxyacid bleach precursors can be used in the composition of the invention. One preferred bleach activator is TAED because it is relatively harmless and is commercially available. Other preferred bleach activators are SNOBS; SBOBS; the quaternary ammonium- ~
substituted peroxyacid bleach precursors as described in US Patent 4,751,015, EP-A-0331229, EP-A-0284292 and EP-A-303,520; and 2-methyl-4H,3,1-benzoxazin-4-one as described in EP-A-0332294, because of their high techn;cal performances.
These activators can be used in their normal crystalline forms or, preferably, in the form of agglomerates or C 7209 (R) granulated particles having a particle size from 0.2 to 2.0 mm made from fine crystalline peroxyacid bleach precursor material of a particle size preferably below 150 ~m. If the bleach activator is used in the unprotected crystalline form, which is possible under very dry conditions, it should preferably be present as coarse crystals having a size of not less than 0.i2 mm.
Still, agglomerates or granulated particles of bleach activators are the preferred forms for use in the present invention. They minimise direct contact between the sodium percarbonate and the bleach activator, thereby preventing undue perhydrolysis reactions from occuring during storage. The technique of agglomeration and granulation is well known in the art, and any of these techniques can be used for preparing the bleach activator granules. For example, bleach activator granules as described in EP-A-0240057 and EP-A-0241962 are very suitable for use in the present invention.
The sodium percarbonate Any grade of sodium percarbonate can be used without any prior treatment being necessary, but a coarse grade is also preferable here. A highly suitable percarbonate grade is that of which at least 60~ by weight has a particle diameter larger than 250 ~m. Other components used in the compositions will preferably also be of similar coarse grades.
The bleaching composition of the invention can be prepared by simple mixing of the dry ingredients in any suitable mixing equipment.
2~129~2 C 7209 (R) EXAMPLE I
The following bleach compositions were prepared by dry mixing sodium percarbonate, TAED granules * and coarse sodium bicarbonate (mean particle size > 125 ~m). The compositions in thermos-flasks were put in an oven at lOO-C for about 24 hours, wherein the temperature of the compositions is monitored. The results of this test, which was designed to assess the self-heating risk, are shown in the following Table :
Composition of the invention Max. rate of Percarbonate/TAED granule/ temp. rise 15 bicarbonate (wt.%) (-C/minute) 1) 90/5/5 41 2) 85/5/10 13 3) 68/12/20 51 4) 64/14/22 7 5) 60/15/25 13 6) S9.5/10.5/30 8 7) 53/18/29 11.5 8) 52.5/17.5/30 27 9) 51/9/40 18 10) 40/30/30 16.5 11) 40/20/40 12.5 12) 30/30/40 6.5 13) 30/20/50 7.5 30 Compositions Max. rate outside the of temp. rise invention (-C/minute) 14) 95/5/0 125 15) 90/10/0 >250 16) 85/15/0 167 17) 85.5/9.5/5 79 18) 80/20/0 >250 19) 80/10/10 109 ~2sæ~2 C 7209 (R) 20) 76.5/13.5/10 .89 21) 75/25/0 189 22) 75/10/15 143 23) 70/15/15 ~250 24) 67.5/22.5/10 219 25) 50/30/20 167 26) 40/40/20 219 * TAED granule composition :
% by weight TAED 83.0 Sodium sulphate 9.2 Sokalan ~ CP5-polymer 2.3 Bentonite clay 2.3 Water + minor salts 3.2 From the above results it is clear that the compositions of the invention show relatively low rates of temperature rise as compared with the compositions outside the invention showing relatively high to very high rates of temperature rise, which is indicative of the excellent stability of the compositions of the invention in contrast with the compositions outside the invention showing high to very high rate of exothermic decomposition.
EXAMPLE II
68/12/20 Formulations were prepared with 20% of various diluent materials. These formulations were subjected to~
the same exothermic decomposition testing at lOO C as in Example I. The results are tabulated below.
C 7209 (R) Max. rate of Composition temp. rise (68/12/20) (-C/min.
1) 20% NaH2P04.2H20 29 2) 20% NaH.C03/Na2C03 40 3) 20% NasP301o 146 4) 20% Na2S04 >250 5) 20% Na2C03 >250 6) 20% Citric acid 125 7) 20% K2C3 >250 8) 20% Na2HP04 225 The above results again show the superior stability of compositions 1) and 2) within the invention as compared with compositions 3) to 8) outside the invention.
EXAMPLE III
This Example demonstrates the effectiveness of a bleach additive according to the invention in a washing system using a main wash powder and a builder additive. The bleach additive had the following formulation :
Sodium percarbonate 52.5% by weight Sodium bicarbonate 29.0% " "
TAED granules (83% wt active) 17.5% " "
Blue speckles (of main wash powder) 1.0% " "
100.0% "
Using a Tergotometer with a heat up to 60-C, detergencies with and without bleach additive were compared at the extremes of water hardness using two bleach-sensitive test cloths.
C 7209 (R) The main wash powder comPosition (spray-dried) wt.
Linear alkylbenzene sulphonate 14.2 Nonionic surfactant 6.2 Zeolite (anhydrous) 37.7 5 Sodium silicate 2.2 Sodium carbonate 16.8 Acrylic/maleic copolymer 6.2 Sodium carboxymethyl cellulose 0.8 Proteolytic enzyme 0.6 10 Anti-foam ingredients 1.1 Minor ingredients, salts, moisture 14.2 100. 0 Builder additive composition (dry-mixed) wt.%
15 Zeolite A (anhydrous basis) 58.82 Sodium carbonate 17.9 Sodium sulphate 2.23 Sodium hydroxide 0.38 Sodium citrate 5.0 20 Nonionic surfactant 2.0 Sodium carboxymethyl cellulose 1.54 Perfume 0.1 Water 12.32 The results were as shown in the following Table 3.
Conditions Water hardness French (FH) 7 46 German (-DH) 4 24 Main wash powder dosage (g/l) 4 4 - 202g2~2 11 C 7209 (R) Builder additive dosage (g/l) 0 3 Bleach additive 5dosage (g/l) 0, 1 or 2 0, 1 or 2 Reflectance increase ~R460*) Test cloth 1 (tea on cotton) :
Without bleach 1.51 3.41 with 1 g/l 15.41 20.11 with 2 g/l 17.61 25.51 Test cloth 2 (red wine on cotton) :
. .
Without bleach 15.46 14.96 with 1 g/l 35.16 39.46 with 2 g/l 35.06 41.06 EXAMPLE IV
This Example demonstrates the benefit for the use of a bleach additive according to the invention in a washing process over washing with commercial bleaching detergent compositions.
The experiments were carried out, using the 60-C cycle of a Miele (Trade Mark) 756 washing machine, in 30-(French) hard water, with a 2.5 kg load of clean cotton sheeting and terry towelling. Detergency was monitored, using two different blood-stained test cloths.
Three washes were carried out, using detergent powders as follows :
2 0 ~ 9 2 6 2 C 7209 (R) EXAMPLE IV
Pre-wash : Main wash powder (Example III) 55 g Builder additive (Example III) 20 g s Main wash: Main wash powder (Example III) 100 g Builder additive (Example III) 20 g Bleach additive (Example III) 45 g Comparative Examle A :
No pre-wash Main wash : Commercial bleaching detergent powder A
containing sodium _ _ perborate + TAED 210 g Comarative Example B :
Pre-wash : Commercial bleaching detergent powder B
containing sodium perborate + TAED 112 g Main wash: Commercial bleaching detergent powder B
containing sodium perborate + TAED 140 g~
Detergency results (reflectance increases,a R460*) were as follows :
IV _ B
Test cloth 3 35 (non-clotting blood on cotton) 63.09 36.10 43.82 ' 202g2~2 C 7209 (R) Test cloth 4 (blood/milk/ink on cotton) 33.91 21.90 18.59
This invention relates to a bleaching composition comprising essentially sodium percarbonate as the persalt and a bleach activator for said persalt, which composition can be used, as desired, for admixing with a detergent composition or, preferably, as a bleach additive to a wash liquor for improving the bleaching action of said wash liquor during the wash, particularly in the lower temperature region of from about 20C to 60C.
The term "bleach activator" used herein refers to the broad class of reactive organic compounds which in alkaline solutions containing a source of hydrogen peroxide, e.g. a persalt, will generate the corresponding peroxyacid, which, unlike the persalt or hydrogen peroxide, is an effective oxidising bleach at low temperatures. These compounds are therefore also referred to in the art as peroxyacid bleach precursors, of which N,N,N',N'-tetraacetyl ethylene diamine (TAED), tetraacetyl glycoluril (TAGU), sodium acetoxybenzene sulphonate (SABS), sodium nonanoyloxybenzene sulphonate (SNOBS) and sodium benzoyloxybenzene sulphonate (SBOBS) are only a few typical examples in addition to the many other bleach precursor compounds described in literature, for example US Patents 1,246,339; 3,332,882;
4,128,494; 4,412,934; 4,675,393 and 4,751,015; GB Patent 1,382,594; EP-A-018S553, EP-A-170386, EP-A-0174132; EP-A-0120591; EP-A-0284292; EP-A-0303520; EP-A-0331229 and EP-A-0332294.
Sodium perborate mono- or tetrahydrate is currently the most widely used persalt bleaching agent in and with laundry detergent compositions. Bleaching compositions for use as a bleach additive comprising essentially C 7209 (R) 2029~62 sodium perborate mono- or tetra~ydrate, TAED and urea have also been proposed and described in EP-A-0288170.
These compositions containing sodium perborate are relatively stable and relatively easy to formulate.
Sodium perborate, however, is a boron compound, which has been criticized on environmental grounds.
In a move to "greenern products, the invention makes use of the more environmentally acceptable persalt sodium carbonate perhydrate (Na2C03.1~H202), commonly known as sodium percarbonate. Use of sodium percarbonate instead of sodium perborate, however, cannot be a matter of simple substitution. Unlike sodium perborate, sodium percarbonate is substantially less stable.
Japanese Patent Application JP-A-54-163906, published December 27, 1979, discloses a detergent bleach composition comprising 20% by weight of sodium percarbonate, 40% by weight of heat-treated sodium bicarbonate and 3% by weight of a bleach activator. In order to improve stability it is essential, according to this reference, that 1) the sodium percarbonate used must have been subjected to a heat treatment at a temperature of about 70-C-110C for 10-120 minutes, and that 2) the composition should contain a substantial amount of an acidic compound selected from succinic acid, citric acid and maleic acid.
Another important aspect of stability problems encountered with compositions containing higher levels of sodium percarbonate and a bleach activator is that which relates to the self-heating risk in factory handling, particularly if the product gets warm.
Various means have been proposed for stabilising or at least improving the stability of sodium percarbonate ~E
C 7209 (R) se, for example by coating it with a borate-containing composition as described in GB Patent 2,123,404.
These so-called stabilised percarbonates, however, are still unsatisfactory in terms of self-heating risk when used in a bleaching composition comprising a bleach activator.
According to the invention there is now provided a stable and highly effective bleaching composition comprising essentially :
(a) from 10% to 90% by weight of sodium percarbonate;
(b) at least 4% to 40% by weight of a bleach activator; and (c) from 5% to 85% by weight of an alkali metal bicarbonate, an alkali metal sesquicarbonate or an alkali metal dihydrogen orthophosphate, wherein the ratio by weight of component (a) to (b) is not less than 4:5 and the ratio by weight of component (c) to (b) is not less than 5:4, with the proviso that, if component (b) is present at a level of more than 8~, the amount of component (c) should be at least 20%.
The sodium percarbonate used in the present invention need not have been subjected to a heat treatment.
Use of the so-called stabilised percarbonates in the composition of the invention is possible but appears to result only in a marginal improvement.
Hence, the great advantage of the present invention is that a satisfactorily stable bleaching composition can be formulated with untreated, substantially unstabilised sodium percarbonate as manufactured.
20292~2 C 7209 (R) It is also of note that the present invention does not require the presence of acidic compounds in the stated amounts as suggested in the above Japanese reference.
Preferred compositions are therefore substantially free of succinic acid, citric acid or maleic acid.
The alkali metal salts used as component (c) are ' preferably the sodium salts, i.e. sodium bicarbonate, sodium sesquicarbonate and sodium dihydrogen orthophosphate (NaH2P04.2H20), the sodium bi- or sesqui-carbonates being particularly preferred as being non-phosphorus. Besides, the presence of sodium bicarbonate does not appear to influence the bleaching performance of the composition to any significant extent over the dosage range of interest, except for the dilution effect.
Apart from the above components, the bleaching composition of the invention may additionally contain sodium carbonate, as partial replacement for sodium bicarbonate. It has been found that sodium carbonate used at a level up to equal the amount of sodium bicarbonate does not affect the stability properties of the composition. Though not essential, the composition of the invention may further contain minor amounts of any known ingredients normally used in detergent or bleach compositions up to a level of about 10%, preferably not more than 5% by weight as desired, so long as their presence does not affect the stability properties of the composition.
Accordingly, in a preferred embodiment the composition is a fairly concentrated bleaching composition comprising essentially :
a) from 30% to 85% by weight of sodium percarbonate;
202926~ C 7209 (R) b) from 5% to 30% by weight of a bleach activator;
c) from 10% to 70% by weight of sodium bicarbonate; and d) from 0% to 35% by weight of sodium carbonate.
To this composition, for example, about 1% by weight of coloured detergent base powder speckles may be added for the purpose of product identification. Preferred speckles are, for example, blue- or green-coloured sodium carbonate particles.
Specifically preferred are those compositions which combine optimal stability with optimal performance when used as a bleach additive, comprising essentially :
(a) from 40% to 60% by weight of sodium percarbonate;
(b) from 12% to 25% by weight of bleach activator;
(c) from 20% to 50% by weight of sodium bicarbonate; and (d) from 0% to 15% by weight of sodium carbonate.
The bleach activator As explained before, any bleach activator from the broad class of peroxyacid bleach precursors can be used in the composition of the invention. One preferred bleach activator is TAED because it is relatively harmless and is commercially available. Other preferred bleach activators are SNOBS; SBOBS; the quaternary ammonium- ~
substituted peroxyacid bleach precursors as described in US Patent 4,751,015, EP-A-0331229, EP-A-0284292 and EP-A-303,520; and 2-methyl-4H,3,1-benzoxazin-4-one as described in EP-A-0332294, because of their high techn;cal performances.
These activators can be used in their normal crystalline forms or, preferably, in the form of agglomerates or C 7209 (R) granulated particles having a particle size from 0.2 to 2.0 mm made from fine crystalline peroxyacid bleach precursor material of a particle size preferably below 150 ~m. If the bleach activator is used in the unprotected crystalline form, which is possible under very dry conditions, it should preferably be present as coarse crystals having a size of not less than 0.i2 mm.
Still, agglomerates or granulated particles of bleach activators are the preferred forms for use in the present invention. They minimise direct contact between the sodium percarbonate and the bleach activator, thereby preventing undue perhydrolysis reactions from occuring during storage. The technique of agglomeration and granulation is well known in the art, and any of these techniques can be used for preparing the bleach activator granules. For example, bleach activator granules as described in EP-A-0240057 and EP-A-0241962 are very suitable for use in the present invention.
The sodium percarbonate Any grade of sodium percarbonate can be used without any prior treatment being necessary, but a coarse grade is also preferable here. A highly suitable percarbonate grade is that of which at least 60~ by weight has a particle diameter larger than 250 ~m. Other components used in the compositions will preferably also be of similar coarse grades.
The bleaching composition of the invention can be prepared by simple mixing of the dry ingredients in any suitable mixing equipment.
2~129~2 C 7209 (R) EXAMPLE I
The following bleach compositions were prepared by dry mixing sodium percarbonate, TAED granules * and coarse sodium bicarbonate (mean particle size > 125 ~m). The compositions in thermos-flasks were put in an oven at lOO-C for about 24 hours, wherein the temperature of the compositions is monitored. The results of this test, which was designed to assess the self-heating risk, are shown in the following Table :
Composition of the invention Max. rate of Percarbonate/TAED granule/ temp. rise 15 bicarbonate (wt.%) (-C/minute) 1) 90/5/5 41 2) 85/5/10 13 3) 68/12/20 51 4) 64/14/22 7 5) 60/15/25 13 6) S9.5/10.5/30 8 7) 53/18/29 11.5 8) 52.5/17.5/30 27 9) 51/9/40 18 10) 40/30/30 16.5 11) 40/20/40 12.5 12) 30/30/40 6.5 13) 30/20/50 7.5 30 Compositions Max. rate outside the of temp. rise invention (-C/minute) 14) 95/5/0 125 15) 90/10/0 >250 16) 85/15/0 167 17) 85.5/9.5/5 79 18) 80/20/0 >250 19) 80/10/10 109 ~2sæ~2 C 7209 (R) 20) 76.5/13.5/10 .89 21) 75/25/0 189 22) 75/10/15 143 23) 70/15/15 ~250 24) 67.5/22.5/10 219 25) 50/30/20 167 26) 40/40/20 219 * TAED granule composition :
% by weight TAED 83.0 Sodium sulphate 9.2 Sokalan ~ CP5-polymer 2.3 Bentonite clay 2.3 Water + minor salts 3.2 From the above results it is clear that the compositions of the invention show relatively low rates of temperature rise as compared with the compositions outside the invention showing relatively high to very high rates of temperature rise, which is indicative of the excellent stability of the compositions of the invention in contrast with the compositions outside the invention showing high to very high rate of exothermic decomposition.
EXAMPLE II
68/12/20 Formulations were prepared with 20% of various diluent materials. These formulations were subjected to~
the same exothermic decomposition testing at lOO C as in Example I. The results are tabulated below.
C 7209 (R) Max. rate of Composition temp. rise (68/12/20) (-C/min.
1) 20% NaH2P04.2H20 29 2) 20% NaH.C03/Na2C03 40 3) 20% NasP301o 146 4) 20% Na2S04 >250 5) 20% Na2C03 >250 6) 20% Citric acid 125 7) 20% K2C3 >250 8) 20% Na2HP04 225 The above results again show the superior stability of compositions 1) and 2) within the invention as compared with compositions 3) to 8) outside the invention.
EXAMPLE III
This Example demonstrates the effectiveness of a bleach additive according to the invention in a washing system using a main wash powder and a builder additive. The bleach additive had the following formulation :
Sodium percarbonate 52.5% by weight Sodium bicarbonate 29.0% " "
TAED granules (83% wt active) 17.5% " "
Blue speckles (of main wash powder) 1.0% " "
100.0% "
Using a Tergotometer with a heat up to 60-C, detergencies with and without bleach additive were compared at the extremes of water hardness using two bleach-sensitive test cloths.
C 7209 (R) The main wash powder comPosition (spray-dried) wt.
Linear alkylbenzene sulphonate 14.2 Nonionic surfactant 6.2 Zeolite (anhydrous) 37.7 5 Sodium silicate 2.2 Sodium carbonate 16.8 Acrylic/maleic copolymer 6.2 Sodium carboxymethyl cellulose 0.8 Proteolytic enzyme 0.6 10 Anti-foam ingredients 1.1 Minor ingredients, salts, moisture 14.2 100. 0 Builder additive composition (dry-mixed) wt.%
15 Zeolite A (anhydrous basis) 58.82 Sodium carbonate 17.9 Sodium sulphate 2.23 Sodium hydroxide 0.38 Sodium citrate 5.0 20 Nonionic surfactant 2.0 Sodium carboxymethyl cellulose 1.54 Perfume 0.1 Water 12.32 The results were as shown in the following Table 3.
Conditions Water hardness French (FH) 7 46 German (-DH) 4 24 Main wash powder dosage (g/l) 4 4 - 202g2~2 11 C 7209 (R) Builder additive dosage (g/l) 0 3 Bleach additive 5dosage (g/l) 0, 1 or 2 0, 1 or 2 Reflectance increase ~R460*) Test cloth 1 (tea on cotton) :
Without bleach 1.51 3.41 with 1 g/l 15.41 20.11 with 2 g/l 17.61 25.51 Test cloth 2 (red wine on cotton) :
. .
Without bleach 15.46 14.96 with 1 g/l 35.16 39.46 with 2 g/l 35.06 41.06 EXAMPLE IV
This Example demonstrates the benefit for the use of a bleach additive according to the invention in a washing process over washing with commercial bleaching detergent compositions.
The experiments were carried out, using the 60-C cycle of a Miele (Trade Mark) 756 washing machine, in 30-(French) hard water, with a 2.5 kg load of clean cotton sheeting and terry towelling. Detergency was monitored, using two different blood-stained test cloths.
Three washes were carried out, using detergent powders as follows :
2 0 ~ 9 2 6 2 C 7209 (R) EXAMPLE IV
Pre-wash : Main wash powder (Example III) 55 g Builder additive (Example III) 20 g s Main wash: Main wash powder (Example III) 100 g Builder additive (Example III) 20 g Bleach additive (Example III) 45 g Comparative Examle A :
No pre-wash Main wash : Commercial bleaching detergent powder A
containing sodium _ _ perborate + TAED 210 g Comarative Example B :
Pre-wash : Commercial bleaching detergent powder B
containing sodium perborate + TAED 112 g Main wash: Commercial bleaching detergent powder B
containing sodium perborate + TAED 140 g~
Detergency results (reflectance increases,a R460*) were as follows :
IV _ B
Test cloth 3 35 (non-clotting blood on cotton) 63.09 36.10 43.82 ' 202g2~2 C 7209 (R) Test cloth 4 (blood/milk/ink on cotton) 33.91 21.90 18.59
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Stable bleaching composition comprising a persalt and a bleach activator, characterised in that it comprises essentially :
(a) from 10% to 90% by weight of sodium percarbonate;
(b) from 4% to 40% by weight of a bleach activator; and (c) from 5% to 85% by weight of an alkali metal bicarbonate, an alkali metal sesquicarbonate or an alkali metal dihydrogen orthophosphate, wherein the ratio by weight of component (a) to (b) is not less than 4:5 and the ratio by weight of component (c) to (b) is not less than 5:4, with the proviso that, if component (b) is present at a level of more than 8%, the amount of component (c) should be at least 20%.
(a) from 10% to 90% by weight of sodium percarbonate;
(b) from 4% to 40% by weight of a bleach activator; and (c) from 5% to 85% by weight of an alkali metal bicarbonate, an alkali metal sesquicarbonate or an alkali metal dihydrogen orthophosphate, wherein the ratio by weight of component (a) to (b) is not less than 4:5 and the ratio by weight of component (c) to (b) is not less than 5:4, with the proviso that, if component (b) is present at a level of more than 8%, the amount of component (c) should be at least 20%.
2. Bleaching composition according to Claim 1, characterised in that the sodium percarbonate has not been subjected to heat treatment.
3. Bleaching composition according to Claim 1, characterised in that the composition is substantially free of succinic acid, citric acid or maleic acid.
4. Bleaching composition according to Claim 1, characterised in that it comprises essentially :
a) from 30% to 85% by weight of sodium percarbonate;
b) from 5% to 30% by weight of a bleach activator;
c) from 10% to 70% by weight of sodium bicarbonate; and d) from 0% to 35% by weight of sodium carbonate.
a) from 30% to 85% by weight of sodium percarbonate;
b) from 5% to 30% by weight of a bleach activator;
c) from 10% to 70% by weight of sodium bicarbonate; and d) from 0% to 35% by weight of sodium carbonate.
5. Bleaching composition according to Claim 4, characterised in that it comprises essentially :
(a) from 40% to 60% by weight of sodium percarbonate;
(b) from 12% to 25% by weight of bleach activator;
(c) from 20% to 50% by weight of sodium bicarbonate; and (d) from 0% to 15% by weight of sodium carbonate.
(a) from 40% to 60% by weight of sodium percarbonate;
(b) from 12% to 25% by weight of bleach activator;
(c) from 20% to 50% by weight of sodium bicarbonate; and (d) from 0% to 15% by weight of sodium carbonate.
6. Bleaching composition according to Claim 1, characterised in that the bleach activator is a peroxyacid bleach precursor.
7. Bleaching composition according to Claim 6, characterised in that said peroxyacid bleach precursor is N,N,N',N'-tetraacetyl ethylene diamine (TAED).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8925528.2 | 1989-11-09 | ||
| GB898925285A GB8925285D0 (en) | 1989-11-09 | 1989-11-09 | Bleaching composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2029262A1 CA2029262A1 (en) | 1991-05-10 |
| CA2029262C true CA2029262C (en) | 1996-11-12 |
Family
ID=10665977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002029262A Expired - Fee Related CA2029262C (en) | 1989-11-09 | 1990-11-02 | Bleaching composition |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0427314B2 (en) |
| JP (1) | JPH08919B2 (en) |
| AU (1) | AU635577B2 (en) |
| BR (1) | BR9005662A (en) |
| CA (1) | CA2029262C (en) |
| DE (1) | DE69024334T3 (en) |
| ES (1) | ES2081342T5 (en) |
| GB (1) | GB8925285D0 (en) |
| IN (1) | IN171327B (en) |
| ZA (1) | ZA908967B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4038391A1 (en) * | 1990-12-01 | 1992-06-04 | Henkel Kgaa | STABILIZATION OF PERCARBONATE |
| EP0634483B1 (en) * | 1993-07-14 | 2000-09-13 | The Procter & Gamble Company | Stabilised bleaching compositions |
| SE508954C2 (en) | 1997-03-21 | 1998-11-16 | Eriksson Jan Olof | Detergent, free from surfactants |
| EP1064845B1 (en) * | 1999-06-30 | 2003-09-10 | Kao Corporation | Virucidal and sporicidal composition |
| DE102006026039A1 (en) | 2005-10-07 | 2007-04-19 | Söll Gmbh | Composition, useful for combating pathogenic germs and parasites in aquaculture, ponds and aquariums, comprises alkalicarbonate-peroxyhydrate and alkalihydrogen carbonate |
| EP2157162A1 (en) * | 2008-08-13 | 2010-02-24 | The Procter and Gamble Company | Particulate bleaching composition comprising enzymes |
| EP2447350A1 (en) * | 2010-10-29 | 2012-05-02 | The Procter & Gamble Company | Bleach coparticle |
| MX350446B (en) * | 2013-09-30 | 2017-09-07 | Chemlink Laboratories Llc | Environmentally preferred antimicrobial compositions. |
| DE102014218950A1 (en) * | 2014-09-19 | 2016-03-24 | Henkel Ag & Co. Kgaa | Solid composition for textile treatment |
| BR112023019583A2 (en) | 2021-04-01 | 2023-12-05 | Sterilex LLC | QUATERNARY-FREE POWDER DISINFECTANT/SANITIZER |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3671439A (en) * | 1969-07-22 | 1972-06-20 | American Home Prod | Oxygen bleach-activator systems stabilized with puffed borax |
| JPS5313354B2 (en) * | 1974-03-06 | 1978-05-09 | ||
| JPS54163906A (en) * | 1978-06-16 | 1979-12-27 | Kao Corp | Foamable bleachable detergent composition |
| US4299716A (en) * | 1979-03-06 | 1981-11-10 | Lever Brothers Company | Detergent compositions |
| CH659082A5 (en) * | 1984-04-09 | 1986-12-31 | Ciba Geigy Ag | Detergent powder additives in the form of speckles |
| JPS60260699A (en) * | 1984-06-07 | 1985-12-23 | 栗田工業株式会社 | Detergent compostion |
| ES2000190A4 (en) * | 1986-01-21 | 1988-01-01 | Pennwalt Corp | IMPROVED TEXTILE DETERGENT. |
| JPH0668116B2 (en) * | 1986-07-14 | 1994-08-31 | 花王株式会社 | Cleaning bleach composition |
-
1989
- 1989-11-09 GB GB898925285A patent/GB8925285D0/en active Pending
-
1990
- 1990-10-25 DE DE69024334T patent/DE69024334T3/en not_active Expired - Lifetime
- 1990-10-25 ES ES90202851T patent/ES2081342T5/en not_active Expired - Lifetime
- 1990-10-25 EP EP90202851A patent/EP0427314B2/en not_active Expired - Lifetime
- 1990-11-02 JP JP2298768A patent/JPH08919B2/en not_active Expired - Lifetime
- 1990-11-02 CA CA002029262A patent/CA2029262C/en not_active Expired - Fee Related
- 1990-11-07 AU AU65852/90A patent/AU635577B2/en not_active Ceased
- 1990-11-08 IN IN288/BOM/90A patent/IN171327B/en unknown
- 1990-11-08 ZA ZA908967A patent/ZA908967B/en unknown
- 1990-11-08 BR BR909005662A patent/BR9005662A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB8925285D0 (en) | 1989-12-28 |
| ES2081342T5 (en) | 2005-02-16 |
| EP0427314B2 (en) | 2004-06-16 |
| AU635577B2 (en) | 1993-03-25 |
| EP0427314A3 (en) | 1991-10-23 |
| BR9005662A (en) | 1991-09-17 |
| JPH03223400A (en) | 1991-10-02 |
| DE69024334T3 (en) | 2004-10-21 |
| ES2081342T3 (en) | 1996-03-01 |
| EP0427314B1 (en) | 1995-12-20 |
| IN171327B (en) | 1992-09-19 |
| CA2029262A1 (en) | 1991-05-10 |
| DE69024334D1 (en) | 1996-02-01 |
| ZA908967B (en) | 1992-07-29 |
| AU6585290A (en) | 1991-05-16 |
| JPH08919B2 (en) | 1996-01-10 |
| DE69024334T2 (en) | 1996-05-09 |
| EP0427314A2 (en) | 1991-05-15 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |