EP0415472A2
Expired / Lapsed
EP
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Granulated bleach activator particles
Assignee: Unilever PLC
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Filing: 1990-08-08
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Granted: —
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Expires: 2010-08-08
Abstract
Abstract Stable bleach activator composition in the form of spray-dried granules comprising from 50-98% by weight of a water-soluble peroxyacid bleach precursor, from 2-50% by weight of a film-forming polymeric material, and from 0-48% by weight of an inert organic or inorganic salt. The spray-dried bleach activator granules show the combined characteristics of excellent storage stability, improved mechanical strength and attrition resistance, as well as good dispersibility and dissolution rate. Bleach and laundry compositions containing the bleach activator granules are also disclosed.
Inventors
- 👤 William John Unilever Research Iley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:44
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3935; C11D11/00; C11D11/02; C11D3/3907
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A bleach activator composition in the form of spray-dried granules comprising a water-soluble organic peroxyacid bleach precursor, characterized in that it comprises in homogeneous distribution : (i) from 50% to about 98% by weight of a water-soluble peroxyacid bleach precursor; (ii) from 2% to about 50% by weight of a film-forming polymeric material; and (iii) from 0% to about 48% by weight of an inert organic or inorganic salt.
Claim 2
Dependent Claim
69 words
A bleach activator composition in the form of spray-dried granules comprising a water-soluble organic peroxyacid bleach precursor, characterized in that it comprises in homogeneous distribution : (i) from 50% to about 98% by weight of a water-soluble peroxyacid bleach precursor; (ii) from 2% to about 50% by weight of a film-forming polymeric material; and (iii) from 0% to about 48% by weight of an inert organic or inorganic salt.
Claim 3
Dependent Claim
52 words
A composition according to Claim 1, characterized in that it comprises ; (i) from 60% to 90% by weight of said water-soluble peroxyacid bleach precursor; (ii) from 5% to 30% by weight of said film-forming polymeric material; and (iii) from 5% to 35% by weight of said inert organic or inorganic salt.
Claim 4
Dependent Claim
76 words
A composition according to Claim 1 or 2, characterized in that the water-soluble organic peroxyacid bleach precursor has the general formula: R - - L wherein R is an optionally substituted alkyl group containing 1-12 carbon atoms or an optionally substituted phenyl group containing 6-10 carbon atoms, and L is a leaving group containing an anionic moiety, the conjugate acid of the leaving group having a pK a in the range of from 6 to 13.
Claim 5
Dependent Claim
37 words
A composition according to Claim 3, characterized in that R has the formula : wherein X is H, a halogen (Cl, Br or F) or a straight or branched chain alkyl group containing from 1-4 carbon atoms.
Claim 6
Dependent Claim
19 words
A composition according to Claim 4, characterized in that the water-soluble peroxyacid bleach precursor is sodium p-benzoyloxy benzene sulphonate.
Claim 7
Dependent Claim
20 words
A composition according to any of Claims 1-5, characterized in that the film-forming polymeric material is a non-oxidizable acidic polymer.
Claim 8
Dependent Claim
33 words
A composition according to Claim 6, characterized in that said polymer is a non-cellulosic homo- or copolymer of mono- or poly-carboxylic acids, having an average molecular weight of from 500 to about 1,000,000.
Claim 9
Dependent Claim
47 words
A composition according to Claim 6 or 7, characterized in that said polymeric material is selected from the group consisting of polyacrylic acids, phosphinate-modified polyacrylic acids, copolymers of maleic acid (anhydride) and acrylic or methacrylic acid, and acidic copolymers based on polymethacrylic acid and polyacrylic acid esters.
Claim 10
Dependent Claim
17 words
A composition according to any of Claims 1-8, characterized in that the inert salt is sodium sulphate.
Claim 11
Dependent Claim
72 words
A process for preparing a granular bleach activator composition according to Claims 1-8, by spray-drying an aqueous slurry comprising a water-soluble bleach activator, characterized in that said aqueous slurry comprises from about 30-50% by weight of water, from about 25-69% by weight of water-soluble peroxyacid bleach precursor, from about 1-10.5% by weight of a film-forming polymeric material, and from 0 to about 44% by weight of an inert organic or inorganic salt.
Claim 12
Dependent Claim
33 words
A bleaching composition comprising from 5% to 99.5% by weight of peroxide compound bleaching agent and from 0.5% to 95% by weight of a bleach activator composition according to any of Claims 1-10.
Claim 13
Dependent Claim
57 words
A laundry composition comprising 2-40% by weight of a detersive surfactant selected from anionic, nonionic, cationic, ampholytic and zwitterionic surfactants and mixtures thereof, from 15-90% by weight of a detergency builder, from 5-35% by weight of a peroxide compound bleaching agent and from 0.5-40% by weight of a bleach activator composition according to any of Claims 1-10.
Claim 14
Dependent Claim
46 words
A laundry composition according to Claim 12, characterized in that it comprises from 5-25% by weight of said surfactant, from 20-60% by weight of said detergency builder, from 8-20% by weight of said peroxide compound bleach and from 1-10% by weight of said bleach activator composition.
References Cited (Backward Citations)
No citation records indexed.
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