US4422950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleach activator granules and preparation thereof
Assignee: Lever Brothers Co
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Filing: 1981-12-04
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Granted: 1983-12-27
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Expires: 2001-12-04
Abstract
Abstract Effervescent bleach activator granules for use in washing and/or bleaching compositions comprising a bleach activator, a peroxoborate and a binding material are disclosed. Preferred granules include an alkali metal perborate monohydrate, preferably in a proportion at least equal to the amount of the bleach activator. These granules have the advantage that the reduction of mechanical loss when used in washing machines combined with a fast dissolution of and reaction between the bleach activator and the percompound in close proximity at a high local pH should improve the bleach performance, particularly in the low/medium temperature range, to a substantial degree.
Inventors
- 👤 Hermanus C. Kemper
- 👤 Pieter Versluis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:18
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
Effervescent bleach activator granules for use in washing and/or bleaching compositions, of a size of from 0.1 to 2.0 mm, comprising (a) a bleach activator which in aqueous solutions reacts with a bleaching percompound which in aqueous solution releases active oxygen, to form a peroxy acid; (b) a peroxoborate of a metal selected from the group consisting of alkali metals, alkaline earth metals and mixtures thereof which on contact with water releases molecular oxygen causing the granules to effervesce; thereby reducing losses due to incomplete dissolution to a substantial degree; and (c) a carrier which is inert to the bleach activator and soluble or dispersible in the wash liquor.
Claim 2
Dependent Claim
109 words
Effervescent bleach activator granules for use in washing and/or bleaching compositions, of a size of from 0.1 to 2.0 mm, comprising (a) a bleach activator which in aqueous solutions reacts with a bleaching percompound which in aqueous solution releases active oxygen, to form a peroxy acid; (b) a peroxoborate of a metal selected from the group consisting of alkali metals, alkaline earth metals and mixtures thereof which on contact with water releases molecular oxygen causing the granules to effervesce; thereby reducing losses due to incomplete dissolution to a substantial degree; and (c) a carrier which is inert to the bleach activator and soluble or dispersible in the wash liquor.
Claim 3
Dependent Claim
13 words
Bleach activator granules according to claim 1, wherein said peroxoborate is sodium peroxoborate.
Claim 4
Dependent Claim
17 words
Bleach activator granules according to claim 1, comprising at least about 5% by weight of said peroxoborate.
Claim 5
Dependent Claim
40 words
Bleach activator granules according to claim 3, comprising from about 5 to 70% by weight of said bleach activator, from about 10 to 50% by weight of said peroxoborate and from about 5 to 50% by weight of said carrier.
Claim 6
Dependent Claim
31 words
Bleach activator granules according to claim 4, comprising from 10-70% by weight of said bleach activator, from 20-50% by weight of said peroxoborate, and from 10-50% by weight of said carrier.
Claim 7
Dependent Claim
15 words
Bleach activator granules according to claim 1, which further includes an alkali metal perborate monohydrate.
Claim 8
Dependent Claim
30 words
Bleach activator granules according to claim 6, wherein said alkali metal perborate monohydrate is present in a proportion by weight at least equal to the amount of the bleach activator.
Claim 9
Dependent Claim
24 words
Bleach activator granules according to claim 6, wherein said alkali metal perborate monohydrate is sodium perborate monohydrate (NaBO 2 .H 2 O 2 ).
Claim 10
Dependent Claim
13 words
Bleach activator granules according to claim 1, wherein said bleach activator is N,N,N',N'-tetraacetylethylenediamine.
Claim 11
Dependent Claim
20 words
Bleach activator granules according to claim 1, wherein said bleach activator has an average particle size of below 0.15 mm.
Claim 12
Dependent Claim
18 words
Bleach activator granules according to claim 1, having a pH within the range of from 10 to 11.5.
Claim 13
Dependent Claim
44 words
Bleach activator granules according to claim 1, wherein said carrier is selected from the group consisting of nonionic surfactants, fatty acids, sodium carboxymethylcellulose, gelatin, polyethylene glycol, fatty alcohols, sodium triphosphate, potassium triphosphate, disodium orthophosphate, magnesium sulfate, silica, clay, alumino silicates, water and mixtures thereof.
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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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |