US4830773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated bleaches
Assignee: Ecolab USA Inc
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Filing: 1987-07-10
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Granted: 1989-05-16
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Expires: 2007-07-10
Abstract
Abstract Stable encapsulated bleach comprising a core of bleaching agent such as an alkaline metal salt of chloroisocyanurate, an inner coating of a chemically compatable separating compound such as sodium sulfate, sodium tripolyphosphate and mixtures thereof, and an outer coating of a water soluble cellulose ether such as hydroxyethyl and hydroxypropyl celluloses.
Inventors
- 👤 Keith E. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:59
CPC Classifications
D; D06; D06L; D06L4/00; C; C11; C11D; C11D17/00; C11D17/0039; C11D3/00; C11D3/395; C11D3/3953
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
99 words
An encapsulated bleach particle, comprising: (a) a bleaching agent core; (b) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (c) an outer coating of encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C 1-4 ) alkyl cellulose, carboxy (C 1-4 ) alkyl cellulose, hydroxy (C 1-4 ) alkyl cellulose, carboxy (C 1-4 ) alkyl hydroxy (C 1-4 ) alkyl cellulose, C 1-4 ) alkyl hydroxy (C 1-4 ) alkyl cellulose, and mixtures thereof.
Claim 2
Dependent Claim
99 words
An encapsulated bleach particle, comprising: (a) a bleaching agent core; (b) an inner coating of a separating compound in an amount sufficient to retard any chemical interaction between the bleaching agent core and an outer coating compound; and (c) an outer coating of encapsulating amount of a water soluble cellulose ether compound selected from the group consisting of (C 1-4 ) alkyl cellulose, carboxy (C 1-4 ) alkyl cellulose, hydroxy (C 1-4 ) alkyl cellulose, carboxy (C 1-4 ) alkyl hydroxy (C 1-4 ) alkyl cellulose, C 1-4 ) alkyl hydroxy (C 1-4 ) alkyl cellulose, and mixtures thereof.
Claim 3
Dependent Claim
16 words
The encapsulated particle of claim 1 wherein the bleaching agent is a source of active halogen.
Claim 4
Dependent Claim
16 words
The encapsulated particle of claim 2 wherein the bleaching agent is a source of active chlorine.
Claim 5
Dependent Claim
18 words
The encapsulated particle of claim 3 wherein the bleaching agent is an alkali metal dichloroisocyanurate, and hydrates thereof.
Claim 6
Dependent Claim
18 words
The encapsulated particle of claim 1 wherein the separating compound is a water soluble detergent builder or filler.
Claim 7
Dependent Claim
24 words
The encapsulated particle of claim 5 wherein the detergent builder or filler is sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof.
Claim 8
Dependent Claim
20 words
The encapsulated particle of claim 5 wherein the water soluble cellulose ether is a hydroxy (C 1-4 ) alkyl cellulose.
Claim 9
Dependent Claim
16 words
The encapsulated particle of claim 7 wherein the hydroxy (C 1-4 ) alkyl cellulose is hydroxypropylcellulose.
Claim 10
Dependent Claim
16 words
The encapsulated particle of claim 7 wherein the hydroxy (C 1-4 ) alkyl cellulose is hydroxyethylcellulose.
Claim 11
Dependent Claim
22 words
The encapsulated particle of claim 7 wherein the hydroxy (C 1-4 ) alkyl cellulose has a DS of about 0.7 to 3.0.
Claim 12
Dependent Claim
16 words
The encapsulated particle of claim 8 wherein the hydroxypropylcellulose has aDDS of about 1.4 to 3.0.
Claim 13
Dependent Claim
17 words
The encapsulated particle of claim 9 wherein the hydroxyethylcellulose has a DS of about 1.2 to 3.0.
Claim 14
Dependent Claim
26 words
The encapsulated particle of claim 1 wherein the encapsulated particle comprises about 20-90 wt-% core, about 50-60 wt-% inner coating and about 1-25 wt-% outer coating.
Claim 15
Dependent Claim
28 words
The encapsulated particle of claim 1 wherein the encapsulated particle comprises about 40-70 wt-% core, about 10-50 wt-% inner coating compound and about 2-10 wt-% outer coating compound.
Claim 16
Dependent Claim
66 words
An encapsulated bleach particle, comprising: (a) about 20-90 wt-% core of an active chlorine source; (b) about 5-60 wt-% inner coating of a detergent builder or filler surrounding and in physical contact with the core; and (c) about 1-25 wt-% outer encapsulating coating of a hydroxy (C 1-4 ) alkyl cellulose which is physically separated from the core of active chlorine source by the inner coating.
Claim 17
Dependent Claim
66 words
An encapsulated bleach particle, comprising: (a) about 20-90 wt-% core of an active chlorine source; (b) about 5-60 wt-% inner coating of a detergent builder or filler surrounding and in physical contact with the core; and (c) about 1-25 wt-% outer encapsulating coating of a hydroxy (C 1-4 ) alkyl cellulose which is physically separated from the core of active chlorine source by the inner coating.
Claim 18
Dependent Claim
41 words
The particle of claim 13 wherein the particle comprises: (a) about 40-70 wt-% core; (b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxypropylcellulose.
Claim 19
Dependent Claim
41 words
The particle of claim 13 wherein the particle comprises: (a) about 40-70 wt-% core; (b) about 10-50 wt-% inner coating of sodium sulfate, sodium chloride, a condensed phosphate or a combination thereof; and (c) about 2-10 wt-% outer coating of hydroxyethylcellulose.
References Cited (Backward Citations)
US3154494A
Cited
US3650961A
Cited
US3637509A
Cited
US3703470A
Cited
US4009113A
Cited
US3983254A
Cited
US3908045A
Cited
US4569780A
Cited
US4569781A
Cited
US4279764A
Cited
US4473620A
Cited
US4657784A
Cited
US4731195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |