Patent US4518161A successfully refreshed from Google Patents.
Patent US5030379A successfully refreshed from Google Patents.
US5030379A
Expired / Lapsed
US
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Process for preparing high bulk density detergent powders admixed with zeolite and coated with nonionic surfactant
Assignee: Chesebrough Ponds Inc
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Filing: 1989-04-28
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Granted: 1991-07-09
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Expires: 2009-04-28
Abstract
Abstract A process for the preparation of a free-flowing detergent powder comprises the steps of (i) mixing a detergent base powder with finely divided zeolite in a weight ratio of the zeolite (hydrated basis) to the base powder of from 0.13:1 to 0.40:1, whereby the small zeolite particles are adhered to the outer surface of the larger base powder particles, and (ii) spraying a liquid composition comprising nonionic surfactant onto the mixture formed in step (i), at a weight ratio of nonionic surfactant to alkali metal aluminosilicate of at least 0.25:1. This improves flow properties, increases bulk density, and improves dispensing in an automatic washing machine.
Inventors
- 👤 Peter C. Knight
- 👤 Thomas Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/06; C11D17/065; C11D3/00; C11D3/02; C11D3/12; C11D3/124; C11D3/1246; C11D3/128
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
134 words
A process for the preparation of a free-flowing detergent powder, which comprises the steps of (i) thoroughly mixing a spray dried detergent base powder in such a manner as to preserve the spray dried particles, said base powder particles comprising at least 20% by weight of one or more detergent-active compounds and one or more detergency builders with finely divided alkali metal aluminosilicate in a weight ratio of the alkali metal aluminosilicate (hydrated basis) to the base powder of from 0.13:1 to 0.40:1, whereby particles of alkali metal aluminosilicate are adhered to the outer surfaces of the particles of the base powder; and (ii) subsequently spraying a liquid composition comprising nonionic surfactant onto the mixture formed in step (i), at a weight ratio of nonionic surfactant to alkali metal aluminosilicate of at least 0.25:1.
Claim 2
Dependent Claim
134 words
A process for the preparation of a free-flowing detergent powder, which comprises the steps of (i) thoroughly mixing a spray dried detergent base powder in such a manner as to preserve the spray dried particles, said base powder particles comprising at least 20% by weight of one or more detergent-active compounds and one or more detergency builders with finely divided alkali metal aluminosilicate in a weight ratio of the alkali metal aluminosilicate (hydrated basis) to the base powder of from 0.13:1 to 0.40:1, whereby particles of alkali metal aluminosilicate are adhered to the outer surfaces of the particles of the base powder; and (ii) subsequently spraying a liquid composition comprising nonionic surfactant onto the mixture formed in step (i), at a weight ratio of nonionic surfactant to alkali metal aluminosilicate of at least 0.25:1.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1, wherein the weight ratio of alkali metal aluminosilicate to base powder is from 0.15:1 to 0.35:1.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 2, wherein the weight ratio of alkali metal aluminosilicate to base powder is from 0.20:1 to 0.33:1.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 wherein the aluminosilicate is present as the crystalline sodium salt.
Claim 6
Dependent Claim
16 words
A process as claimed in claim 1, wherein the alkali metal aluminosilicate is Type A zeolite.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 1, wherein nonionic surfactant is sprayed on in a weight ratio to the alkali metal aluminosilicate of from 0.25:1 to 1.00:1.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1, wherein nonionic surfactant is sprayed on in a weight ratio to the alkali metal aluminosilicate of at least 0.30:1.
Claim 9
Dependent Claim
27 words
A process as claimed in claim 6, wherein nonionic surfactant is sprayed on in a weight ratio to the alkali metal aluminosilicate of from 0.30:1 to 0.70:1.
Claim 10
Dependent Claim
46 words
A process as claimed in claim 1, wherein the powder obtained, after the admixture of the alkali metal aluminosilicate and the spray-on of the nonionic surfactant, gives a dispenser residue (as hereinbefore defined) at least 20% by weight less than that given by the base powder.
Claim 11
Dependent Claim
46 words
A process as claimed in claim 9, wherein the powder obtained, after the admixture of the alkali metal aluminosilicate and the spray-on of the nonionic surfactant, gives a dispenser residue (as hereinbefore defined) at least 30% by weight less than that given by the base powder.
Claim 12
Dependent Claim
24 words
A process as claimed in claim 1, wherein the base powder gives a dispenser residue (as hereinbefore defined) of at least 30% by weight.
Claim 13
Dependent Claim
24 words
A process as claimed in claim 11, wherein the base powder gives a dispenser residue (as hereinbefore defined) of at least 50% by weight.
Claim 14
Dependent Claim
24 words
A process as claimed in claim 11, wherein the base powder gives a dispenser residue (as hereinbefore defined) of at least 70% by weight.
Claim 15
Dependent Claim
22 words
A process as claimed in claim 1, wherein the base powder has a bulk density of less than 500 kg/m 3 .
Claim 16
Dependent Claim
26 words
A process as claimed in claim 14, wherein the base powder has a bulk density within the range of from 400 to 500 kg/m 3 .
Claim 17
Dependent Claim
19 words
A process as claimed in claim 1, wherein the base powder contains not more than 50% alkali metal aluminosilicate.
Claim 18
Dependent Claim
17 words
A process as claimed in claim 1, wherein the base powder contains at least 5% sodium carbonate.
Claim 19
Dependent Claim
18 words
A process as claimed in claim 1, wherein the base powder is substantially free of inorganic phosphate builders.
Claim 20
Dependent Claim
18 words
A process as claimed in claim 1, wherein the base powder is prepared by spray-drying an aqueous slurry.
Claim 21
Dependent Claim
12 words
A detergent powder prepared by a process as claimed in claim 1.
Claim 22
Dependent Claim
19 words
A detergent powder as claimed in claim 20, having a bulk density of at least 500 kg/m 3 .
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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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |