US4126586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of spray drying nonionic surfactant-containing detergents also containing a cationic nitrogen compound
Assignee: Lever Brothers Co
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Filing: 1977-02-07
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Granted: 1978-11-21
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Expires: 1997-02-07
Abstract
Abstract The problem of autoxidation of detergent powders containing relatively large amounts of nonionic surfactants is reduced by incorporating in the crutcher slurry a compound containing a positively charged nitrogen atom. Such compounds should be present in an amount of from 1/2 to 6% of the resultant spray-dried powder. If desired they can be incorporated into the slurry by injection into the high pressure line to the spray-drying tower. Typical compounds containing positively charged nitrogen atoms are quaternary ammonium or organic heterocycle salts, amine oxides and betaines, although quaternary ammonium salts are preferred.
Inventors
- 👤 Michael Curtis
- 👤 Richard L. Davies
- 👤 John S. Galvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:36
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/835; C11D1/38; C11D11/00; C11D11/02; C11D3/00; C11D3/16; C11D3/26; C11D1/62; C11D1/72
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A process for preparing a spray-dried fabric-washing detergent powder substantially free from water-soluble calcium and magnesium salts which comprises: (a) forming an aqueous slurry comprising from 4 to 20% by weight, based on the spray-dried powder, of a nonionic surfactant and from 10 to 60% based on the spray-dried powder of a non-phosphate detergency builder, or a mixture of a non-phosphate detergency builder with a phosphate detergency builder; and (b) spray-drying the slurry to form a spray-dried powder, wherein the process comprises the step of spraying the slurry in the presence of from 1/4 to 6% by weight, based on the spray-dried powder, of a compound containing a positively charged nitrogen atom selected from quaternary ammonium salts, imidazolinium salts and betaines.
Claim 2
Dependent Claim
121 words
A process for preparing a spray-dried fabric-washing detergent powder substantially free from water-soluble calcium and magnesium salts which comprises: (a) forming an aqueous slurry comprising from 4 to 20% by weight, based on the spray-dried powder, of a nonionic surfactant and from 10 to 60% based on the spray-dried powder of a non-phosphate detergency builder, or a mixture of a non-phosphate detergency builder with a phosphate detergency builder; and (b) spray-drying the slurry to form a spray-dried powder, wherein the process comprises the step of spraying the slurry in the presence of from 1/4 to 6% by weight, based on the spray-dried powder, of a compound containing a positively charged nitrogen atom selected from quaternary ammonium salts, imidazolinium salts and betaines.
Claim 3
Dependent Claim
29 words
A process according to claim 1 wherein the nonionic surfactant is present in the slurry in an amount of from 4 to 12% by weight of the spray-dried powder.
Claim 4
Dependent Claim
29 words
A process according to claim 2 wherein the nonionic surfactant is present in the slurry in an amount of from 12 to 20% by weight of the spray-dried powder.
Claim 5
Dependent Claim
34 words
A process according to claim 1 wherein the compound containing a positively charged nitrogen atom is present in the slurry in an amount of from 1/2 to 3% by weight of the spray-dried powder.
Claim 6
Dependent Claim
31 words
A process according to claim 1 wherein the quaternary ammonium compound is a dicoco-dimethyl-ammonium chloride or bromide, a di(hardened tallow) dimethyl ammonium chloride or bromide or a mixture of such compounds.
Claim 7
Dependent Claim
35 words
A process according to claim 1 wherein the nonionic surfactant comprises a C 8 to C 18 Ziegler or Oxo alcohol ethoxylated with from 5 to 20 moles per mole of alcohol, of ethylene oxide.
Claim 8
Dependent Claim
32 words
A process according to claim 1 wherein the compound containing a positive nitrogen atom is injected into a high pressure line carrying pressurised slurry to the spraying nozzles of a spraying tower.
Claim 9
Dependent Claim
131 words
A process for preparing a spray-dried fabric-washing detergent powder substantially free from water-soluble calcium and magnesium salts which comprises: (a) forming an aqueous slurry comprising 4 to 20% by weight, based on the spray-dried powder, of a nonionic surfactant and from 10 to 60% based on the spray-dried powder of a phosphate detergency builder consisting of anhydrous sodium tripolyphosphate containing at least 15% by weight of phase 1 material, or consisting of sodium tripolyphosphate which has been prehydrated; and (b) spray-drying the slurry to form a spray-dried powder wherein the process comprises the step of spraying the slurry in the presence of from 1/4 to 6% by weight, based on the spray-dried powder, of a compound containing a positively charged nitrogen atom selected from quaternary ammonium salts, imidazolinium salts, and betaines.
Claim 10
Dependent Claim
131 words
A process for preparing a spray-dried fabric-washing detergent powder substantially free from water-soluble calcium and magnesium salts which comprises: (a) forming an aqueous slurry comprising 4 to 20% by weight, based on the spray-dried powder, of a nonionic surfactant and from 10 to 60% based on the spray-dried powder of a phosphate detergency builder consisting of anhydrous sodium tripolyphosphate containing at least 15% by weight of phase 1 material, or consisting of sodium tripolyphosphate which has been prehydrated; and (b) spray-drying the slurry to form a spray-dried powder wherein the process comprises the step of spraying the slurry in the presence of from 1/4 to 6% by weight, based on the spray-dried powder, of a compound containing a positively charged nitrogen atom selected from quaternary ammonium salts, imidazolinium salts, and betaines.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |