US4279764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulated bleaches and methods of preparing them
Assignee: Clearon Corp
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Filing: 1980-06-30
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Granted: 1981-07-21
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Expires: 2000-06-30
Abstract
Abstract Bleaching compositions containing a chlorine bleaching agent coated with a silicate bound, hydrated, soluble salt containing an N-H chlorine accepting compound are described. Such compositions exhibit decreased localized dye attack of colored fabrics.
Inventors
- 👤 Gaylen R. Brubaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:58
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3951; C11D17/00; C11D17/0039
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
148 words
A storage stable, halogen bleach system having improved fabric dye compatibility comprising encapsulated particles of a halogen bleaching agent having a least one reactive N-halo atom which releases hypohalite ion under aqueous bleaching conditions, the said particles having thereon a coating of a soluble, hydrated, silicate bound inorganic salt in admixture with an N--H compound, which N--H compound reacts relatively rapidly with the hypohalite ion to produce the corresponding N-halo compound under conditions of elevated hypohalite levels surrounding the encapsulated bleach particles undergoing initial dissolution in aqueous media during preparation of the bleach solution, but which N--H compound reacts relatively slowly with the hypohalite to form said corresponding N-halo compound under the conditions of low hypohalite levels in the final bleach solution after mixing and dissolution of the bleaching agent, the ratio of N-halo compound to N--H compound in said particles being from about 1:1 to about 50:1.
Claim 2
Dependent Claim
148 words
A storage stable, halogen bleach system having improved fabric dye compatibility comprising encapsulated particles of a halogen bleaching agent having a least one reactive N-halo atom which releases hypohalite ion under aqueous bleaching conditions, the said particles having thereon a coating of a soluble, hydrated, silicate bound inorganic salt in admixture with an N--H compound, which N--H compound reacts relatively rapidly with the hypohalite ion to produce the corresponding N-halo compound under conditions of elevated hypohalite levels surrounding the encapsulated bleach particles undergoing initial dissolution in aqueous media during preparation of the bleach solution, but which N--H compound reacts relatively slowly with the hypohalite to form said corresponding N-halo compound under the conditions of low hypohalite levels in the final bleach solution after mixing and dissolution of the bleaching agent, the ratio of N-halo compound to N--H compound in said particles being from about 1:1 to about 50:1.
Claim 3
Dependent Claim
67 words
A storage stable, chlorine bleach composition having improved fabric compatibility comprising encapsulated particles of a chlorinated isocyanurate bleaching agent, said particles having thereon a coating of a soluble, hydrated, silicate bound inorganic salt containing a soluble halogen accepting N--H compound selected from the group consisting of a sulfamate, an N-alkylcarboxamide and alanine, the ratio of chlorinated isocyanurate to N--H compound being from about 1:1 to about 50:1.
Claim 4
Dependent Claim
67 words
A storage stable, chlorine bleach composition having improved fabric compatibility comprising encapsulated particles of a chlorinated isocyanurate bleaching agent, said particles having thereon a coating of a soluble, hydrated, silicate bound inorganic salt containing a soluble halogen accepting N--H compound selected from the group consisting of a sulfamate, an N-alkylcarboxamide and alanine, the ratio of chlorinated isocyanurate to N--H compound being from about 1:1 to about 50:1.
Claim 5
Dependent Claim
26 words
The composition according to claim 2 wherein the chlorinated isocyanurate is selected from the class consisting of potassium dichloroisocyanurate and sodium dichloroisocyanurate and hydrated salts thereof.
Claim 6
Dependent Claim
13 words
The composition according to claim 2 wherein the N--H compound is a sulfamate.
Claim 7
Dependent Claim
72 words
A storage stable, chlorine bleach composition having improved fabric dye compatibility comprising encapsulated particles of a chlorinated isocyanurate bleaching agent, said particles having thereon a coating of a soluble, hydrated, sodium silicate bound inorganic salt containing sulfamic acid, the said particles containing by weight about 1 to 40% chlorinated isocyanurate; about 30 to 90% of inorganic salt; about 2 to 20% of sodium silicate and about 1 to 20% of sulfamic acid.
Claim 8
Dependent Claim
72 words
A storage stable, chlorine bleach composition having improved fabric dye compatibility comprising encapsulated particles of a chlorinated isocyanurate bleaching agent, said particles having thereon a coating of a soluble, hydrated, sodium silicate bound inorganic salt containing sulfamic acid, the said particles containing by weight about 1 to 40% chlorinated isocyanurate; about 30 to 90% of inorganic salt; about 2 to 20% of sodium silicate and about 1 to 20% of sulfamic acid.
Claim 9
Dependent Claim
14 words
The composition according to claim 5 wherein the chlorinated isocyanurate is sodium dichloroisocyanurate dihydrate.
Claim 10
Dependent Claim
13 words
The composition according to claim 6 wherein the chlorinated isocyanurate is potassium dichloroisocyanurate.
Claim 11
Dependent Claim
53 words
A detergent composition consisting essentially of by weight (a) from about 5% to about 50% of the bleach composition of any of claims 1 through 7; (b) from about 5% to about 50% by weight of a detergent agent and (c) from about 1% to about 60% by weight of a detergency builder.
Claim 12
Dependent Claim
151 words
A process of preparing a storage stable, chlorine bleach composition having improved fabric dye compatibility comprising: A. forming a granular dry mix consisting essentially of a chlorinated isocyanurate bleaching agent, a soluble, halogen accepting N--H compound selected from the group consisting of a sulfamate, an N-alkylcarboxamide and alanine, and a soluble, hydratable inorganic salt at least 50% by weight of the non-bleach solids having a mean diameter of about 2 to 50 times smaller than said bleaching agent; and B. adding with agitation to said dry mix an aqueous solution of sodium silicate to induce agglomeration and produce particles of chlorinated isocyanurate coated with a layer of silicate bound, at least partially hydrated inorganic salt containing said N--H compound, the SiO 2 /Na 2 O weight ratio in said silicate solution being from about 3.22:1 to about 2.40:1 and having a total solids content of about 1.0 to 50% by weight.
Claim 13
Dependent Claim
151 words
A process of preparing a storage stable, chlorine bleach composition having improved fabric dye compatibility comprising: A. forming a granular dry mix consisting essentially of a chlorinated isocyanurate bleaching agent, a soluble, halogen accepting N--H compound selected from the group consisting of a sulfamate, an N-alkylcarboxamide and alanine, and a soluble, hydratable inorganic salt at least 50% by weight of the non-bleach solids having a mean diameter of about 2 to 50 times smaller than said bleaching agent; and B. adding with agitation to said dry mix an aqueous solution of sodium silicate to induce agglomeration and produce particles of chlorinated isocyanurate coated with a layer of silicate bound, at least partially hydrated inorganic salt containing said N--H compound, the SiO 2 /Na 2 O weight ratio in said silicate solution being from about 3.22:1 to about 2.40:1 and having a total solids content of about 1.0 to 50% by weight.
Claim 14
Dependent Claim
14 words
The process according to claim 9 wherein the bleaching agent is sodium dichloroisocyanurate dihydrate.
Claim 15
Dependent Claim
13 words
The process according to claim 9 wherein the bleaching agent is potassium dichloroisocyanurate.
Claim 16
Dependent Claim
13 words
The process according to claim 9 wherein the N--H compound is sulfamic acid.
Claim 17
Dependent Claim
15 words
The process according to claim 9 wherein the hydratable inorganic salt is anhydrous sodium carbonate.
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |