Patent US4741858A successfully refreshed from Google Patents.
US4741858A
Expired / Lapsed
US
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Timed-release hypochlorite bleach compositions
Assignee: Clorox Co
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Filing: 1987-03-02
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Granted: 1988-05-03
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Expires: 2007-03-02
Abstract
Abstract Timed-release bleaching compounds containing encapsulated hypochlorite bleaching agents are disclosed, along with a method for using the compounds. A preferred embodiment of the invention includes sodium silicate-coated lithium hypochlorite. One or more additional coatings to further delay timed release are optional. The novel bleach compounds are especially useful in reducing fabric and dye damage in fabric bleaching while facilitating the inclusion of optional laundry additives such a enzymes and brighteners. The encapsulates have good shelf stability and are effective over a wide range of temperatures and concentrations.
Inventors
- 👤 Clement K. Choy
- 👤 Gregory van Buskirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:23
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0039; C11D3/00; C11D3/395; C11D3/3953
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A timed-release hypochlorite bleach composition, comprising: granules of a lithium hypochlorite bleaching agent; and a first coating consisting essentially of sodium silicate, said coating encapsulating substantially each of said granules, thereby forming a lithium metasilicate interface around the lithium hypochlorite encapsulate, said interface having a limited solubility which will cause said first coating to release controlledly in aqueous solution.
Claim 2
Dependent Claim
59 words
A timed-release hypochlorite bleach composition, comprising: granules of a lithium hypochlorite bleaching agent; and a first coating consisting essentially of sodium silicate, said coating encapsulating substantially each of said granules, thereby forming a lithium metasilicate interface around the lithium hypochlorite encapsulate, said interface having a limited solubility which will cause said first coating to release controlledly in aqueous solution.
Claim 3
Dependent Claim
29 words
The composition of claim 1, wherein said sodium silicate is comprised of SiO 2 and Na 2 O in a weight ratio of from about 0.5:1 to about 3.8:1.
Claim 4
Dependent Claim
29 words
The composition of claim 2, wherein said sodium silicate is comprised of SiO 2 and Na 2 O in a weight ratio of from about 2.5:1 to about 3.2:1.
Claim 5
Dependent Claim
36 words
The composition of claim 1, further including a second coating on said first coating, said second coating being selected from the group consisting of inversely soluble cellulose derivatives, inversely soluble polyols, and alkylated quaternary ammonium salts.
Claim 6
Dependent Claim
12 words
The composition of claim 4 wherein said second coating includes distearyldimethylammonium chloride.
Claim 7
Dependent Claim
22 words
The composition of claim 4, further including a third coating on said second coating, said third coating being a quaternary ammonium salt.
Claim 8
Dependent Claim
13 words
The composition of claim 6, wherein said quaternary ammonium salt is distearyldimethylammonium chloride.
Claim 9
Dependent Claim
32 words
The composition of claim 1, wherein said granules are initially released into aqueous solution within about 1 to 5 minutes after addition of water and are completely released within about 15 minutes.
Claim 10
Dependent Claim
23 words
The composition of claim 1, wherein said compound is effective over a temperature range of from about 40 to about 130 degrees Fahrenheit.
Claim 11
Dependent Claim
23 words
The composition of claim 9, wherein said compound is effective over a temperature range of from about 70 to about 130 degrees Fahrenheit.
Claim 12
Dependent Claim
21 words
A composition as in claim 1 further comprising an enzyme, an optical brightening agent or mixtures thereof admixed with said granules.
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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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |