US3979314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detergent compositions
Assignee: Lever Brothers Co
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Filing: 1974-08-14
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Granted: 1976-09-07
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Expires: 1994-08-14
Abstract
Abstract Finely divided calcium carbonate used in a detergent composition containing sodium carbonate as a detergency builder, is treated before drying with a water-insoluble dispersing aid. This decreases the tendency of the calcium carbonate particles to aggregate and be deposited on fabrics during washing.
Inventors
- 👤 Terence Frederick Child
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:22
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/12; C11D3/1233; C11D3/04; C11D3/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A detergent composition comprising from about 5% to about 40% of a synthetic anionic, nonionic, amphoteric or zwitterionic detergent active compound, from about 10% to 75% of sodium or potassium carbonate detergency builder and from about 5% to about 60% of finely divided precipitated calcium carbonate prepared by passing carbon dioxide into a suspension of calcium hydroxide, said calcium carbonate having a surface area of from about 30 to about 100 square meters per gram (m 2 /g) treated before drying with a water insoluble inorganic dispersing aid selected from the group consisting of natural montmorillonite-type clays and synthetic montmorillonite-type materials, in an amount of about 1% to about 50% by weight based on the weight of the calcium carbonate, said treated calcium carbonate having a decreased tendency to aggregation and deposition on washed fabrics.
Claim 2
Dependent Claim
135 words
A detergent composition comprising from about 5% to about 40% of a synthetic anionic, nonionic, amphoteric or zwitterionic detergent active compound, from about 10% to 75% of sodium or potassium carbonate detergency builder and from about 5% to about 60% of finely divided precipitated calcium carbonate prepared by passing carbon dioxide into a suspension of calcium hydroxide, said calcium carbonate having a surface area of from about 30 to about 100 square meters per gram (m 2 /g) treated before drying with a water insoluble inorganic dispersing aid selected from the group consisting of natural montmorillonite-type clays and synthetic montmorillonite-type materials, in an amount of about 1% to about 50% by weight based on the weight of the calcium carbonate, said treated calcium carbonate having a decreased tendency to aggregation and deposition on washed fabrics.
Claim 3
Dependent Claim
21 words
A detergent composition according to claim 1, including from about 10% to about 25% by weight of the detergent active compound.
Claim 4
Dependent Claim
19 words
A detergent composition according to claim 1, including from about 20% to about 60% of sodium or potassium carbonate.
Claim 5
Dependent Claim
22 words
A detergent composition according to claim 1, including from about 10% to about 40% by weight of the finely divided calcium carbonate.
Claim 6
Dependent Claim
13 words
A detergent composition according to claim 1, wherein the calcium carbonate is calcite.
Claim 7
Dependent Claim
18 words
A detergent composition according to claim 1, wherein the calcium carbonate is treated with a natural montmorillonite clay.
Claim 8
Dependent Claim
32 words
A detergent composition according to claim 1, wherein the calcium carbonate is treated with about 5% to about 25% by weight of dispersing aid based on the weight of the calcium carbonate.
Claim 9
Dependent Claim
18 words
A detergent composition according to claim 1, including not more than about 0.5% by weight of sodium tripolyphosphate.
Claim 10
Dependent Claim
24 words
A detergent composition according to claim 1, wherein the detergent active compound is sodium linear secondary alkyl (C 10 -C 15 ) benzene sulphonate.
Claim 11
Dependent Claim
21 words
A detergent composition according to claim 1, wherein the detergent active compound is sodium alkyl (C 10 -C 18 ) sulphate.
Claim 12
Dependent Claim
13 words
A detergent composition according to claim 6, wherein the montmorillonite clay is bentonite.
Claim 13
Dependent Claim
51 words
A process for making a detergent composition in powder form according to claim 1, by forming an aqueous slurry of detergent ingredients and then spray drying the slurry to form the detergent powder, wherein the calcium carbonate is treated with the dispersing aid in aqueous suspension prior to detergent slurry making.
Claim 14
Dependent Claim
48 words
A process for making a detergent composition in powder form according to claim 1, by forming an aqueous slurry of detergent ingredients and then spray drying the slurry to form the detergent powder, wherein the calcium carbonate and the dispersion aid are separately added to the detergent slurry.
References Cited (Backward Citations)
US3716488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |