Patent US4298491A successfully refreshed from Google Patents.
US4298491A
Expired / Lapsed
US
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Process for making detergent compositions
Assignee: Lever Brothers Co
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Filing: 1980-05-19
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Granted: 1981-11-03
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Expires: 2000-05-19
Abstract
Abstract The autoxidation of aqueous detergent slurries containing major quantities of nonionic surfactant during spray-drying is inhibited by the use of a charge-transfer agent. The charge-transfer agent may be a charge-transfer acceptor or a charge-transfer donor or a precursor of either of these. The agent may be present in an amount of from 0.05 to 2% by weight and the nonionic surfactant in an amount of 3% or more by weight based on the weight of the fully formulated detergent powder. The preferred charge-transfer agent is potassium iodide.
Inventors
- 👤 Andrew C. Coxon
- 👤 David J. Edge
- 👤 Mark L. L. Lapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:44
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/046; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; C11D1/00; C11D1/66; C11D1/72; C11D11/00; C11D11/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
In a process for the production of a detergent powder by spray-drying an aqueous slurry comprising 3% or more by weight of a nonionic surfactant, the improvement which comprises inhibiting autoxidation by incorporating from 0.05 to 2% by weight of a charge transfer agent selected from the group consisting of stannic chloride, silver perchlorate, and iodine the percentages being based on the fully formulated detergent powder.
Claim 2
Dependent Claim
66 words
In a process for the production of a detergent powder by spray-drying an aqueous slurry comprising 3% or more by weight of a nonionic surfactant, the improvement which comprises inhibiting autoxidation by incorporating from 0.05 to 2% by weight of a charge transfer agent selected from the group consisting of stannic chloride, silver perchlorate, and iodine the percentages being based on the fully formulated detergent powder.
Claim 3
Dependent Claim
36 words
A process in accordance with claim 1, wherein the charge-transfer agent is present in the slurry in an amount of from 0.1 to 0.5% by weight, based on the weight of the fully formulated detergent powder.
Claim 4
Dependent Claim
36 words
A process in accordance with claim 1, wherein the nonionic surfactant comprises 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 5
Dependent Claim
33 words
A process in accordance with claim 1 wherein the nonionic surfactant is incorporated into the powder partly by spray-drying an aqueous slurry containing the surfactant and partly by a method other than spray-drying.
Claim 6
Dependent Claim
31 words
A process in accordance with claim 4 wherein the aqueous slurry comprises from 3 to 12% by weight of nonionic surfactant, based on the weight of the fully formulated detergent powder.
Claim 7
Dependent Claim
31 words
A process in accordance with claim 1 wherein the aqueous slurry comprises from 3% to 20% by weight of nonionic surfactant, based on the weight of the fully formulated detergent powder.
Claim 8
Dependent Claim
91 words
In a process for the production of a detergent powder by spray-drying an aqueous slurry comprising 3% or more by weight of a nonionic surfactant, the improvement which comprises inhibiting autoxidation by incorporating from 0.05 to 2% by weight of a charge transfer agent selected from the group consisting of 1, 3, 5 trinitobenzene; tetrachlorobenzoquinone; 1, 3, 5 triacetobenzene, 1, 2, 4 triacetobenzene; 1, 3, 5 trimethoxybenzene; 1, 2, 3 trimethoxybenzene; hexamethyl benzene; 1, 2, 4, 5 tetramethyl benzene and hexaketocyclohexane, the percentages being based on the fully formulated detergent powder.
Claim 9
Dependent Claim
91 words
In a process for the production of a detergent powder by spray-drying an aqueous slurry comprising 3% or more by weight of a nonionic surfactant, the improvement which comprises inhibiting autoxidation by incorporating from 0.05 to 2% by weight of a charge transfer agent selected from the group consisting of 1, 3, 5 trinitobenzene; tetrachlorobenzoquinone; 1, 3, 5 triacetobenzene, 1, 2, 4 triacetobenzene; 1, 3, 5 trimethoxybenzene; 1, 2, 3 trimethoxybenzene; hexamethyl benzene; 1, 2, 4, 5 tetramethyl benzene and hexaketocyclohexane, the percentages being based on the fully formulated detergent powder.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |