EP0072166A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Bleach catalyst compositons, use thereof in laundry bleaching and detergent compositions, and process of bleaching therewith
Assignee: Procter and Gamble Ltd
•
Filing: 1982-08-02
•
Granted: —
•
Expires: 2002-08-02
Abstract
Abstract Laundry bleaching and detergent compositions comprising a peroxygen bleaching agent and a catalyst system therefor, the catalyst system comprising a heavy metal cation of defined bleach catalytic activity, particularly copper. iron or manganese cations, an auxiliary metal cation having little or no bleach catafytic activity. particularly zinc or aluminium cations, and a sequestrant having defined stability constants for the catalytic and auxiliary metal cations. particularly ethylenediamine- tetraacetic acid. ethylenediaminetetra-(methylene-phosphonic acid) and water-soluble salts thereof. The laundry bleaching and detergent compositions deliver improved bleach performance, particularly at medium to high wash temperatures. Catalyst compositions for peroxygen bleaching agents are also disclosed.
Inventors
- 👤 Charles David Bragg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:07
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/26; C11D3/33; C11D3/36; C11D3/364; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3932
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
138 words
A catalyst composition for a peroxygen bleaching agent, the composition being soluble in water at pH 10 and being characterized by: (a) a catalytic heavy metal cation having a catalytic activity for decomposition of the peroxygen bleaching agent of at least 10%, (b) an auxiliary metal cation having a catalytic activity for decomposition of the peroxgyen bleaching agent of less than 10%, and (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1.
Claim 2
Dependent Claim
138 words
A catalyst composition for a peroxygen bleaching agent, the composition being soluble in water at pH 10 and being characterized by: (a) a catalytic heavy metal cation having a catalytic activity for decomposition of the peroxygen bleaching agent of at least 10%, (b) an auxiliary metal cation having a catalytic activity for decomposition of the peroxgyen bleaching agent of less than 10%, and (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1.
Claim 3
Dependent Claim
30 words
A composition according to Claim 1 characterized in that the catalytic heavy metal is vanadium, chromium, manganese, iron, cobalt or copper, and the auxiliary metal is zinc, aluminium, or nickel.
Claim 4
Dependent Claim
132 words
A catalyst composition for a peroxygen bleaching agent, the composition being soluble in water at pH 10 and being characterized by an admixture of: (a) a catalytic heavy metal cation selected from vanadium, chromium, manganese, iron, cobalt, copper, osmium, platinum, palladium, silver, mercury and lead, (b) an auxiliary metal cation selected from zinc, aluminium or nickel, and (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1.
Claim 5
Dependent Claim
132 words
A catalyst composition for a peroxygen bleaching agent, the composition being soluble in water at pH 10 and being characterized by an admixture of: (a) a catalytic heavy metal cation selected from vanadium, chromium, manganese, iron, cobalt, copper, osmium, platinum, palladium, silver, mercury and lead, (b) an auxiliary metal cation selected from zinc, aluminium or nickel, and (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1.
Claim 6
Dependent Claim
36 words
A composition according to any of Claims 1 to 3 characterized in that the water-soluble sequestrant is selected from ethylenediamine tetraacetic acid, diethylenetriaminepentaacetic acid, ethylenediamine- tetra(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), and alkali-metal and alkaline-earth metal salts thereof.
Claim 7
Dependent Claim
94 words
A composition according to any of Claims 1 to 4 characterized in that the catalytic heavy metal cation is Cu(II), the auxiliary metal cation is Zn(II) or Al(III), the sequestrant is selected from ethylenediamine-tetraacetic acid, ethylenediaminetetra(methylene-phosphonic acid), mixtures thereof and alkali-metal or alkaline earth metal salts thereof, and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1.1:1 to 10:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1.1:1 to 10:1
Claim 8
Dependent Claim
31 words
A laundry bleaching composition characterized by from 5% to 99.95% of peroxygen bleaching agent and from 0.05% to 5% of a catalyst system according to any of Claims 1 to 5.
Claim 9
Dependent Claim
62 words
A laundry detergent composition characterized by (a) from 0% to 40% of surfactant selected from anionic, nonionic, ampholytic and zwitterionic surfactants and mixtures thereof, (b) from 5% to 90% of inorganic or organic detergency builder, (c) from 5% to 35% of peroxygen bleaching agent, and (d) from 0.05% to 2% of a catalyst system according to any of Claims 1 to 5.
Claim 10
Dependent Claim
42 words
A composition according to any of Claims 1 to 7 characterized by a dry-mixture of: (a) a first particulate component comprising the auxiliary metal cation, (b) a second particulate component comprising the catalytic heavy metal cation, and (c) particulate peroxygen bleaching agent.
Claim 11
Dependent Claim
66 words
A composition according to Claim 8 characterized in that the second particulate component is an agglomerate comprising from 0.01 to 2, preferably from 0.05 to 1.5 mMoles% of catalytic metal cation and from 0.01, to 3, preferably from 0.05 to 3 mMoles% of sequestrant incorporated in a water-soluble or water-dispersible organic . carrier having a melting point greater than about 30°C, preferably greater than about 40°C.
Claim 12
Dependent Claim
45 words
A composition according to Claim 9 characterized in that the organic carrier is selected from C 16 -C 24 fatty alcohols ethoxylated with from 10 to 100 ethylene oxide units, polyethyleneglycols having a molecular weight of from about 400 to about 40,000 and mixtures thereof.
Claim 13
Dependent Claim
149 words
A composition according to Claim 8, 9 or 10 characterized by a dry mixture of: (a) from 40% to 93.9% of spray dried base powder comprising from 0% to 40% surfactant, from 5% to 90% inorganic or organic detergency builder, and from 0.5 to 3mMoles% of auxiliary metal cation, (b) from 0.1% to 10% of an agglomerate comprising from 0.01 to 2, preferably 0.05 to 1.5mMoles% of catalytic metal cation and from 0.01 to 3, preferably from 0.05 to 3mMoles% of the sequestrant incorporated in a water-soluble or water-dispersible organic carrier having a melting point of at least 30°C and/or in a matrix of water-soluble salt, said agglomerate being substantially free of unbound water, and (c) from 5% to 35% of.peroxygen bleaching agent; the composition additionally containing from 1% to 15% of ethoxylated nonionic surfactant sprayed onto the dry mixture of spray-dried base powder, agglomerate and peroxygen bleaching agent.
Claim 14
Dependent Claim
34 words
A process for making the composition of any of Claims 6 to 11 characterized by the step of precomplexing the catalytic heavy metal cation and sequestrant prior to admixture with the peroxygen bleaching agent.
Claim 15
Dependent Claim
72 words
A process according to Claim 12 characterized by the steps of agglomerating the complex of catalytic heavy metal cation and sequestrant with a water-soluble or water-dispersible organic carrier having a melting point of at least 30°C and/or with a water-soluble salt whereby the agglomerate so formed is substantially free of unbound water, and dry-mixing the agglomerate with a separate particulate component comprising the auxiliary metal cation and with particulate peroxygen bleaching agent.
Claim 16
Dependent Claim
161 words
A process of bleaching soiled fabrics characterized by contacting the fabrics with an aqueous wash liquor containing:- (a) from 5.10 -4 to 3.10 -1 mMoles/litre of a catalytic heavy metal cation having a catalytic activity for decomposition of the peroxygen bleaching agent of at least 10%,; (b) from 5.10 3 to 6.10 -1 mMoles/litre of an auxiliary metal cation having a catalytic activity for decomposition of the peroxgyen bleaching agent of less than 10%, (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK c ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1, and (d) from 0.01 to 10 g/litre of peroxygen bleaching agent.
Claim 17
Dependent Claim
161 words
A process of bleaching soiled fabrics characterized by contacting the fabrics with an aqueous wash liquor containing:- (a) from 5.10 -4 to 3.10 -1 mMoles/litre of a catalytic heavy metal cation having a catalytic activity for decomposition of the peroxygen bleaching agent of at least 10%,; (b) from 5.10 3 to 6.10 -1 mMoles/litre of an auxiliary metal cation having a catalytic activity for decomposition of the peroxgyen bleaching agent of less than 10%, (c) a sequestrant having logarithmic stability constants for the catalytic heavy metal cation (pK c ) and for the auxiliary metal cation (pK a ) satisfying the following conditions: and wherein the molar ratio of the sum total of (auxiliary metal cation + catalytic heavy metal cation) to sequestrant is in the range from 1:1 to 20:1 and the molar ratio of sequestrant to catalytic heavy metal cation is in the range from 1:1 to 40:1, and (d) from 0.01 to 10 g/litre of peroxygen bleaching agent.
References Cited (Backward Citations)
GB1192524A
Cited
US3583924A
Cited
FR2335593A1
Cited
DE3012922A1
Cited
EP0025608A2
Cited
EP0051509A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.