Patent US4853143A successfully refreshed from Google Patents.
US4853143A
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Bleach activator compositions containing an antioxidant
Assignee: Procter and Gamble Co
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Filing: 1988-03-16
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Granted: 1989-08-01
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Expires: 2008-03-16
Abstract
Abstract Bleach activator, bleach and detergent compositions comprising: (a) a peroxyacid bleach precursor having the general formula I Ac--L I wherein Ac is the acyl moiety of an organic carboxylic acid comprising an optionally substituted, linear or branched C 6 -C 20 alkyl or alkenyl moiety or a C 6 -C 20 alkyl-substituted aryl moiety and L is a leaving group, the conjugate acid of which has a pKa in the range from 4 to 13, and (b) an antioxidant. The compositions combine excellent stability, substrate-safety, water-dispersibility, granulometry and detergency performance.
Inventors
- 👤 Frederick E. Hardy
- 👤 Frank Cselik
- 👤 Alastair J. Pretty
- 👤 Kenneth Young
- 👤 Gerald Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:07
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10; C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3935; C11D3/0005; C11D3/0084; C11D3/3907
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A bleach activator composition in the form of particles, comprising: (a) from about 50% to about 99.9% by weight of a peroxyacid bleach precursor having the general formula I Ac--L I wherein Ac is the acyl moiety of an organic carboxylic acid comprising an optionally substituted, linear or branched C 6 -C 20 alkyl or alkenyl moiety or a C 6 -C 20 alkyl-substituted aryl moiety and L is a leaving group, the conjugate acid of which has a pKa in the range from about 4 to about 13, and (b) from about 0.1% to about 50% by weight of 4-methyl-2,6-di-t-butylphenol, and (c) from about 0.5% to 50% by weight of polyvinylpyrrolidone, wherein said 4-methyl-2,6-di-t-butylphenol is incorporated within said polyvinylpyrrolidone.
Claim 2
Dependent Claim
120 words
A bleach activator composition in the form of particles, comprising: (a) from about 50% to about 99.9% by weight of a peroxyacid bleach precursor having the general formula I Ac--L I wherein Ac is the acyl moiety of an organic carboxylic acid comprising an optionally substituted, linear or branched C 6 -C 20 alkyl or alkenyl moiety or a C 6 -C 20 alkyl-substituted aryl moiety and L is a leaving group, the conjugate acid of which has a pKa in the range from about 4 to about 13, and (b) from about 0.1% to about 50% by weight of 4-methyl-2,6-di-t-butylphenol, and (c) from about 0.5% to 50% by weight of polyvinylpyrrolidone, wherein said 4-methyl-2,6-di-t-butylphenol is incorporated within said polyvinylpyrrolidone.
Claim 3
Dependent Claim
27 words
A bleach activator composition according to claim 1 wherein the weight ratio of 4-methyl-2,6-di-t-butylphenol to polyvinylpyrrolidone is in the range of from about 3:1 to about 1:6.
Claim 4
Dependent Claim
33 words
A bleach activator composition according to claim 2 wherein said range is from about 2:1 to about 1:3 and wherein said polyvinylpyrrolidone has a molecular weight of from about 3,000 to about 55,000.
Claim 5
Dependent Claim
121 words
A process of making a composition according to claim 2, comprising the steps of: (a) incorporating 4-methyl-2,6-di-t-butylphenol in a polyvinylpyrrolidone carrier at a weight ratio of from about 3:1 to about 1:6, (b) comminuting the product of step (a) to a weight-average particle size of from about 2 mm to about 0.05 mm, (c) admixing the product of step (b) with a water-soluble, inorganic diluent, and (d) coating or agglomerating the product of step (c) with an organic coating or agglomerating material; wherein the final product comprises from about 20% to about 94% of said product of step (a), from about 5% to about 60% of said diluent, and from about 1% to about 20% of said coating or agglomerating material.
Claim 6
Dependent Claim
54 words
A detergent composition, comprising: (a) from about 1% to about 75% of organic surfactant selected from anionic, nonionic, cationic, ampholytic and zwitterionic surfactants and mixtures thereof, (b) from about 0.5% to about 40% of peroxygen bleaching agent, and (c) from about 0.1% to about 20% of a bleach activator composition according to claim 1.
Claim 7
Dependent Claim
118 words
A detergent composition according to claim 5 wherein said bleach activator composition is made according to a process comprising the steps of: (a) incorporating 4-methyl-2,6-di-t-butylphenol in a polyvinylpyrrolidone carrier, (b) comminuting the product of step (a) to a weight-average particle size of from about 2 mm to about 0.05 mm, (c) admixing the product of step (b) with a water-soluble, inorganic diluent, and (d) coating or agglormerating the product of step (c) with an organic coating or agglomerating material; wherein the final product comprises from about 20% to about 94% of said product of step (a), from about 5% to about 50% of said diluent, and from about 1% to about 20% of said coating or agglomerating material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |