Patent US4725378A successfully refreshed from Google Patents.
US4725378A
Expired / Lapsed
US
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Systems for delayed release of bleaching agents
Assignee: DowBrands Inc
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Filing: 1984-04-30
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Granted: 1988-02-16
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Expires: 2004-04-30
Abstract
Abstract Novel compositions useful in supplying bleach over a period of time are produced by contacting a polycarboxylic acid, a second polymeric compound, and a chlorine-releasing agent under the proper conditions.
Inventors
- 👤 Dawn T. Krawczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:34
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3746; C11D3/3769; C11D3/3776; C11D3/3703; C11D3/3707; C11D3/3757; C11D3/3761; C11D3/395; C11D3/3951
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
47 words
A delayed-release bleaching composition in solid form comprising: (a) a chlorine-releasing agent; and (b) an amount of a polymeric association product of a polymeric carboxylic acid and a second polymeric compound, which amount is sufficient to delay the release of the chlorine-releasing agent into a liquid environment.
Claim 2
Dependent Claim
47 words
A delayed-release bleaching composition in solid form comprising: (a) a chlorine-releasing agent; and (b) an amount of a polymeric association product of a polymeric carboxylic acid and a second polymeric compound, which amount is sufficient to delay the release of the chlorine-releasing agent into a liquid environment.
Claim 3
Dependent Claim
18 words
A composition of claim 1 wherein the second polymeric compound is a polyether, a polyamine or a polyamide.
Claim 4
Dependent Claim
34 words
A composition of claim 2 wherein the second polymeric compound is chosen from poly(ethyl oxazoline), poly(ethylene glycol), poly(acrylamide), poly(vinyl pyrrolidone), copolymers of propylene glycol and ethylene glycol, and copolymers of maleic anhydride and ethylene.
Claim 5
Dependent Claim
13 words
A composition of claim 3 wherein the second polymeric compound is poly(ethyl oxazoline).
Claim 6
Dependent Claim
31 words
A composition of claim 3 wherein the polycarboxylic acid contains an average of from about 0.7 to about 1.2 free carboxyl groups per 100 molecular weight of said polymeric polycarboxylic acid.
Claim 7
Dependent Claim
16 words
A composition of claim 5 wherein the polymeric polycarboxylic acid is poly(methacrylic acid) or poly(acrylic acid).
Claim 8
Dependent Claim
38 words
A composition of claim 4 wherein the chlorine-releasing agent is a complex of trichloroisocyanurate and potassium dichloroisocyanurate, wherein the molar ratio of the former to the latter is approximately one to four, potassium dichloroisocyanurate, sodium dichloroisocyanurate, or trichloroisocyanurate.
Claim 9
Dependent Claim
31 words
A composition of claim 7 wherein the chlorine-releasing agent is present in an amount which is from about 0.3 to about 3 weight parts per weight part of polymeric association product.
Claim 10
Dependent Claim
42 words
A process for the preparation of a delayed-release bleaching composition comprising contacting, in the presence of a solvent, a polymeric polycarboxylic acid, a second polymeric compond, and a chlorine-releasing agent under such conditions that there is formed a composition of claim 1.
Claim 11
Dependent Claim
21 words
The process of claim 9 wherein the second polymeric compound is a poly(ethyl oxazoline), a poly(ethylene glycol), or a poly(vinyl pyrrolidone).
Claim 12
Dependent Claim
36 words
The process of claim 10 wherein a solvent is employed, and wherein the pH of the mixture of solvent, polycarboxylic acid and second polymeric compound is about 3.5 or higher before the chlorine-releasing agent is added.
Claim 13
Dependent Claim
31 words
The process of claim 11 wherein the polycarboxylic acid, the second polymeric compound and the chlorine-releasing agent are contacted at a temperature of from about 0° C. to about 25° C.
Claim 14
Dependent Claim
31 words
The process of claim 12 wherein the solvent is water and the pH of the mixture of solvent, polycarboxylic acid and second polymeric compound is from about 6 to about 8.
Claim 15
Dependent Claim
31 words
The process of claim 13 wherein the polycarboxylic acid, the second polymeric compound and the chlorine-releasing agent are contacted at a temperature of from about 5° C. to about 10° C.
Claim 16
Dependent Claim
26 words
The process of claim 14 wherein the pH of the mixture of solvent, polycarboxylic acid and second polymeric compound is from about 6.8 to about 7.2.
Claim 17
Dependent Claim
70 words
A delayed-release bleaching composition in solid form comprising: (a) a chlorine-releasing agent; and (b) an amount of a polymeric association product of: (i) a polymeric polycarboxylic acid; and (ii) a poly(ethyl oxazoline) which, when combined in solution or suspension with a polymeric polycarboxylic acid under the proper conditions, will form a polymeric association product; which amount is sufficient to delay the release of the chlorine-releasing agent into a liquid environment.
Claim 18
Dependent Claim
70 words
A delayed-release bleaching composition in solid form comprising: (a) a chlorine-releasing agent; and (b) an amount of a polymeric association product of: (i) a polymeric polycarboxylic acid; and (ii) a poly(ethyl oxazoline) which, when combined in solution or suspension with a polymeric polycarboxylic acid under the proper conditions, will form a polymeric association product; which amount is sufficient to delay the release of the chlorine-releasing agent into a liquid environment.
Claim 19
Dependent Claim
31 words
A composition of claim 16 wherein the chlorine-releasing agent is present in an amount which is from about 0.3 to about 3 weight parts per weight part of polymeric association product.
Claim 20
Dependent Claim
16 words
A composition of claim 16 wherein the polymeric polycarboxylic acid is poly(methacrylic acid) or poly(acrylic acid).
Claim 21
Dependent Claim
52 words
A composition in solid form comprising: (a) a polymeric association product of a polymeric polycarboxylic acid and a second polymeric compound selected from the group consisting of polyethers, polyamides, and polyamines; and (b) from about 0.3 to about 3 weight parts of a chlorine-releasing agent per weight parts of polymeric association product.
Claim 22
Dependent Claim
52 words
A composition in solid form comprising: (a) a polymeric association product of a polymeric polycarboxylic acid and a second polymeric compound selected from the group consisting of polyethers, polyamides, and polyamines; and (b) from about 0.3 to about 3 weight parts of a chlorine-releasing agent per weight parts of polymeric association product.
Claim 23
Dependent Claim
23 words
A composition of claim 17 wherein the weight ratio of chlorine-releasing agent to polymeric association product is from about 0.3 to about 1.
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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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |