US4650599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free-flowing detergent powder compositions containing sodium perborate monohydrate
Assignee: Lever Brothers Co
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Filing: 1985-05-13
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Granted: 1987-03-17
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Expires: 2005-05-13
Abstract
Abstract Improved detergent powder compositions containing at least a detergent-active material, a detergency builder and sodium perborate monohydrate, and method of making such compositions are disclosed, the improvement being that a sodium perborate monohydrate is used which has physical characteristics of specific surface area (SA in m 2 /g) and pore volume (PV in cm 3 /g) such that the formula (SA+31.25 PV-16.25) is greater than zero. The detergent powder compositions comprising said specific perborate monohydrate have less tendency to caking during storage under high humidity climatic conditions and have the further advantage of maintaining their quick bleach delivery in solution owing to said perborate monohydrate which retains its rapid rate of dissolution despite water-uptake during storage.
Inventors
- 👤 Pauline Farnworth
- 👤 Peter F. Garner-Gray
- 👤 Michael W. Parslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:12
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A method for preparing a free-flowing detergent powder comprising: (i) selecting sodium perborate monohydrate having physical characteristics of specific surface area (SA in m 2 /g) and pore volume (PV in cm 3 /g) such that the formula (SA+31.25 PV-16.25) is greater than zero; and (ii) combining from 5 to 50% by weight of said sodium perborate monohydrate, from 4 to 50% by weight of a detergent-active material selected from the group consisting of soap, synthetic anionic, nonionic, amphoteric, zwitterionic and cationic detergent-active materials and mixtures thereof, and from 5 to 80% by weight of a detergency builder.
Claim 2
Independent Claim
98 words
A method for preparing a free-flowing detergent powder comprising: (i) selecting sodium perborate monohydrate having physical characteristics of specific surface area (SA in m 2 /g) and pore volume (PV in cm 3 /g) such that the formula (SA+31.25 PV-16.25) is greater than zero; and (ii) combining from 5 to 50% by weight of said sodium perborate monohydrate, from 4 to 50% by weight of a detergent-active material selected from the group consisting of soap, synthetic anionic, nonionic, amphoteric, zwitterionic and cationic detergent-active materials and mixtures thereof, and from 5 to 80% by weight of a detergency builder.
Claim 3
Dependent Claim
19 words
A method for preparing a detergent powder composition according to claim 1, wherein said formula is greater than 1.
Claim 4
Dependent Claim
26 words
A method for preparing a detergent powder composition according to claim 1, wherein said perborate monohydrate has a pore volume greater than 0.2 cm 3 /gram.
Claim 5
Dependent Claim
28 words
A method for preparing a detergent powder composition according to claim 1, wherein said perborate monohydrate has a specific surface area of more than 5 m 2 /gram.
Claim 6
Dependent Claim
24 words
A method for preparing a detergent powder composition according to claim 4, wherein said specific surface area is greater than 7 m 2 /gram.
Claim 7
Dependent Claim
19 words
A method for preparing a detergent powder composition according to claim 1, which is free from sodium tripolyphosphate builder.
Claim 8
Dependent Claim
24 words
A method for preparing a detergent powder composition according to claim 1, which has a phosphorus content of not more than 6% by weight.
Claim 9
Dependent Claim
48 words
A method for preparing a detergent powder composition according to claim 7, which contains a detergency builder system comprising sodium tripolyphosphate together with another builder selected from the group consisting of alkali metal nitrilotriacetates, alkali metal orthophosphates, alkali metal pyrophosphates, alkali metal carbonates, sodium aluminosilicates and mixtures thereof.
Claim 10
Dependent Claim
32 words
A method for preparing a detergent powder composition according to claim 7, which contains a detergency builder selected from the group consisting of alkali metal carbonates, sodium aluminosilicates, nitrilotriacetates and mixtures thereof.
Claim 11
Dependent Claim
25 words
A method for preparing a detergent powder composition according to claim 1, which contains from 4 to 25% by weight of a nonionic detergent-active material.
Claim 12
Dependent Claim
24 words
A method for preparing a detergent powder composition according to claim 10, containing from 5 to 16% by weight of said nonionic detergent-active material.
Claim 13
Dependent Claim
25 words
A method for preparing a detergent powder composition according to claim 1, wherein said sodium perborate monohydrate is present from about7 to 35% by weight.
Claim 14
Dependent Claim
20 words
A method for preparing a detergent powder composition according to claim 1, wherein said builder is other than alkalimetal aluminosilicate.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |