US4009113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of materials
Assignee: Lever Brothers Co
•
Filing: 1974-02-25
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Granted: 1977-02-22
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Expires: 1994-02-25
Abstract
Abstract The disclosure relates to the protection of solid precursors in powder detergent compositions using a hydrogen peroxide bleach system. The finely divided precursor is formed, with a carrier material, into a composite particle which is then coated. The coated particle gives good dispersion of the precursor in the wash liquor.
Inventors
- 👤 Robin John Green
- 👤 Richard Shaw Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:56
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3907; C11D17/00; C11D17/0039; C11D3/3935
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
157 words
An alkali stable, water dispersible, precursor-containing body for use in an alkaline powder detergent composition, consisting essentially of: a. about 40% to about 80% by weight of the body of a finely divided, particulate precursor compound capable of reacting with hydrogen peroxide in an aqueous medium that will form a peracid bleaching species below 60° C, said particulate precursor compound being capable of passing through a mesh screen of about 0.15 mm; and b. an inert carrier material of lauric acid, sodium dodecyl hydrogen phthalate, sodium dodecyl hydrogen succinate, sodium lauryl sulphate, or liquid paraffin, said carrier material being substantially evenly distributed with said precursor compound to form a composite particle having an outer protective, non-deliquescent, coherent layer of polyvinyl alcohol, a polyacrylamide, a starch, a water-soluble cellulose ether or a water-soluble gum for preventing aqueous alkaline attack on said precursor compound; said precursor-containing body having a diameter of from about 0.3 mm to about 3.00 mm.
Claim 2
Dependent Claim
157 words
An alkali stable, water dispersible, precursor-containing body for use in an alkaline powder detergent composition, consisting essentially of: a. about 40% to about 80% by weight of the body of a finely divided, particulate precursor compound capable of reacting with hydrogen peroxide in an aqueous medium that will form a peracid bleaching species below 60° C, said particulate precursor compound being capable of passing through a mesh screen of about 0.15 mm; and b. an inert carrier material of lauric acid, sodium dodecyl hydrogen phthalate, sodium dodecyl hydrogen succinate, sodium lauryl sulphate, or liquid paraffin, said carrier material being substantially evenly distributed with said precursor compound to form a composite particle having an outer protective, non-deliquescent, coherent layer of polyvinyl alcohol, a polyacrylamide, a starch, a water-soluble cellulose ether or a water-soluble gum for preventing aqueous alkaline attack on said precursor compound; said precursor-containing body having a diameter of from about 0.3 mm to about 3.00 mm.
Claim 3
Dependent Claim
27 words
The precursor-containing body defined in claim 1 wherein the precursor is present in an amount of from about 60% to about 80% by weight of said body.
Claim 4
Dependent Claim
15 words
The precursor-containing body defined in claim 1 wherein the precursor is a carboxylic acid anhydride.
Claim 5
Dependent Claim
13 words
The precursor-containing body defined in claim 3 wherein the precursor is phthalic anhydride.
Claim 6
Dependent Claim
15 words
The precursor-containing body defined in claim 1 wherein the precursor is a carboxylic acid ester.
Claim 7
Dependent Claim
15 words
The precursor-containing body defined in claim 1 wherein the precursor is an N-acyl substituted amide.
Claim 8
Dependent Claim
15 words
The precursor-containing body defined in claim 6 wherein the precursor is tetra acetyl ethylene diamine.
Claim 9
Dependent Claim
14 words
The precursor-containing body defined in claim 1 wherein the precursor is a glycol uril.
Claim 10
Dependent Claim
33 words
The precursor-containing body defined in claim 5 wherein the composite particle additionally contains a dispersing aid compound selected from the group consisting of sodium alkyl sulphates, sodium akylaryl sulphonates and sodium olefin sulphonates.
Claim 11
Dependent Claim
16 words
The precursor-containing body defined in claim 9 wherein the dispersing aid compound is sodium lauryl sulphate.
Claim 12
Dependent Claim
54 words
The precursor-containing body defined in claim 9 wherein the precursor compound is phthalic anhydride or tetra acetyl ethylene diamine; the dispersing aid is sodium lauryl sulphate; the carrier material is lauric acid, sodium dodecyl hydrogen phthalate, sodium dodecyl hydrogen succinate, or liquid paraffin; and the outer protective layer is polyvinyl alcohol, dextrin or glucose.
Claim 13
Dependent Claim
31 words
A powder detergent composition comprising an anionic, cationic, nonionic, amphoteric or zwitterionic detergent active compound, or mixtures thereof, and a hydrogen peroxide releasing material and precursor-containing body according to claim 1.
Claim 14
Independent Claim
163 words
A method of forming a stable, water dispersible, precursor-containing body for use in an alkaline powder detergent composition, comprising the steps of: a. admixing and evenly distributing from about 40 to about 80% by weight of the total body of a finely divided particulate precursor compound i. capable of reacting with hydrogen peroxide in an aqueous medium that will form a peracid bleaching active below 60° C, and ii. capable of passing through a mesh screen of about 0.15 mm; with an inert carrier material of lauric acid, sodium dodecyl hydrogen phthalate, sodium dodecyl hydrogen succinate, sodium lauryl sulphate, or liquid paraffin to form a dispersible composite particle; and b. coating said composite particle with an outer-protective, non-deliquescent, coherent layer of polyvinyl alcohol, a polyacrylamide, a starch, a water-soluble cellulose ether or a water-soluble gum, for preventing aqueous alkaline attack with said precursor compound, thereby forming the precursor-containing body, said body having a diameter of from about 0.3 mm to about 3.00 mm.
Claim 15
Independent Claim
163 words
A method of forming a stable, water dispersible, precursor-containing body for use in an alkaline powder detergent composition, comprising the steps of: a. admixing and evenly distributing from about 40 to about 80% by weight of the total body of a finely divided particulate precursor compound i. capable of reacting with hydrogen peroxide in an aqueous medium that will form a peracid bleaching active below 60° C, and ii. capable of passing through a mesh screen of about 0.15 mm; with an inert carrier material of lauric acid, sodium dodecyl hydrogen phthalate, sodium dodecyl hydrogen succinate, sodium lauryl sulphate, or liquid paraffin to form a dispersible composite particle; and b. coating said composite particle with an outer-protective, non-deliquescent, coherent layer of polyvinyl alcohol, a polyacrylamide, a starch, a water-soluble cellulose ether or a water-soluble gum, for preventing aqueous alkaline attack with said precursor compound, thereby forming the precursor-containing body, said body having a diameter of from about 0.3 mm to about 3.00 mm.
Claim 16
Dependent Claim
20 words
A method according to claim 13 wherein the precursor-containing body contains at least 60% by weight of the precursor compound.
Claim 17
Dependent Claim
27 words
A method according to claim 13 wherein the precursor compound is a carboxylic acid anhydride, a carboxylic acid ester, an N-acyl substituted amide or a glycol uril.
Claim 18
Dependent Claim
18 words
A method according to claim 15 wherein the precursor compound is phthalic anhydride or tetra acetyl ethylene diamine.
Claim 19
Dependent Claim
41 words
A method according to claim 13 wherein a dispersing aid compound selected from the group consisting of sodium alkyl sulphates, sodium akylaryl sulphonates and sodium olefin sulphonates is additionally admixed with the precursor compound and carrier to form said composite particle.
Claim 20
Dependent Claim
25 words
A method according to claim 13 wherein the composite particle is subjected to a spheronization step prior to being coated with said outer protective layer.
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |