Patent US4481020A successfully refreshed from Google Patents.
US4140650A
Expired / Lapsed
US
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Process for manufacture of detergent powders
Assignee: Lever Brothers Co
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Filing: 1977-11-25
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Granted: 1979-02-20
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Expires: 1997-11-25
Abstract
Abstract The invention relates to the preparation of spray-dried powders of low bulk density. Fabric washing powders containing nonionic surfactants as the major or sole detergent-active species have unacceptably high natural bulk densities (about 0.6 g/l). It has been found that the incorporation of certain alkenyl succinate salts into the crutcher slurry can reduce the bulk density of the resultant spray-dried powder. There is also a need for absorbents of low bulk density for manufacturing nonionic-surfactant based powders by dry-mixing routes and it has been found that suitable absorbents can be prepared by adding alkenyl succinate to a slurry of the chosen ingredients and spray-drying.
Inventors
- 👤 Raymond J. Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:21
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2075; C11D3/2082; C11D1/00; C11D1/66; C11D1/72; C11D11/00; C11D11/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
A process for the manufacture of a detergent powder comprising the steps of (a) forming an aqueous slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH). (CH 2 ) n .COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms; (b) spray drying the resultant slurry to form a spray dried powder; and (c) combining said spray dried powder with a C 7 to C 24 primary or secondary alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol.
Claim 2
Dependent Claim
142 words
A process for the manufacture of a detergent powder comprising the steps of (a) forming an aqueous slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH). (CH 2 ) n .COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms; (b) spray drying the resultant slurry to form a spray dried powder; and (c) combining said spray dried powder with a C 7 to C 24 primary or secondary alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the ethoxylated alcohol comprises from 5 to 15% by weight of the detergent powder.
Claim 4
Dependent Claim
35 words
A process according to claim 1, wherein the ethoxylated alcohol comprises a C 8 to C 18 alcohol ethoxylated with an average of from 5 to 15 moles of ethylene oxide per mole of alcohol.
Claim 5
Dependent Claim
18 words
A process according to claim 1 wherein the ethoxylated alcohol has a hydrophobic-lipophilic balance of up to 13.
Claim 6
Dependent Claim
148 words
A process for the manufacture of a detergent powder comprising the steps of (a) forming an aqueous crutcher slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, from 5 to 15%, based on the weight of the detergent powder, of a primary or secondary C 7 to C 24 alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH).(CH 2 ) n .COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms; and (b) spray drying the resultant slurry to form a spray dried powder.
Claim 7
Dependent Claim
148 words
A process for the manufacture of a detergent powder comprising the steps of (a) forming an aqueous crutcher slurry comprising an ingredient of sodium tripolyphosphate, sodium pyrophosphate, sodium orthophosphate, sodium carbonate, sodium silicate or sodium sulphate, or a mixture thereof, from 5 to 15%, based on the weight of the detergent powder, of a primary or secondary C 7 to C 24 alcohol ethoxylated with from 1 to 20 moles of ethylene oxide per mole of alcohol, and from 1/2 to 5% by weight of said ingredient of a mono- or di-alkali metal or ammonium salt of a dicarboxylic acid of the general formula R.CH(COOH).(CH 2 ) n .COOH where n is 0 or 1, and R is a primary or secondary straight chain alkyl or alkenyl group containing from 10 to 20 carbon atoms; and (b) spray drying the resultant slurry to form a spray dried powder.
Claim 8
Dependent Claim
35 words
A process according to claim 5 wherein the ethoxylated alcohol comprises a C 8 to C 18 alcohol ethoxylated with an average of from 5 to 15 moles of ethylene oxide per mole of alcohol.
Claim 9
Dependent Claim
18 words
A process according to claim 5 wherein the ethoxylated alcohol has a hydrophobic-lipophilic balance of up to 13.
References Cited (Backward Citations)
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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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |