Patent US4110291A successfully refreshed from Google Patents.
US4110291A
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Copolymer emulsions for thickening acrylic polymer latices
Assignee: ISP Investments LLC
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Filing: 1977-02-18
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Granted: 1978-08-29
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Expires: 1997-02-18
Abstract
Abstract Copolymer emulsions comprising (1) an alpha , beta -unsaturated carboxylic acid and (2) methyl acrylate are useful as thickening agents, particularly in acrylic polymer latices.
Inventors
- 👤 Eugene S. Barabas
- 👤 Andrew Klein
- 👤 Dru W. Alwani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:25
CPC Classifications
C; C08; C08L; C08L33/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A method for thickening acrylic polymer latices which comprises blending therewith a copolymer latex prepared by inducing, at a temperature of about 5° C. to about 80° C, a redox-initiated polymerization in an aqueous dispersion of, as monomers, (1) from about 30 to about 75 wt. % of an α,β-unsaturated carboxylic acid of the formula ##STR4## in which R is methyl or ethyl, and (2) from about 25 to about 70 wt. % of methylacrylate.
Claim 2
Independent Claim
75 words
A method for thickening acrylic polymer latices which comprises blending therewith a copolymer latex prepared by inducing, at a temperature of about 5° C. to about 80° C, a redox-initiated polymerization in an aqueous dispersion of, as monomers, (1) from about 30 to about 75 wt. % of an α,β-unsaturated carboxylic acid of the formula ##STR4## in which R is methyl or ethyl, and (2) from about 25 to about 70 wt. % of methylacrylate.
Claim 3
Dependent Claim
12 words
A method according to claim 1 in which (1) is methacrylic acid.
Claim 4
Dependent Claim
33 words
A method according to claim 1 in which the range of monomer (1) is from 50 to 65 wt. % and the range of monomer (2) is from 35 to 50 wt. %.
Claim 5
Dependent Claim
13 words
A method according to claim 3 in which monomer (1) is methacrylic acid.
Claim 6
Dependent Claim
31 words
A method according to claim 1 wherein the copolymer latex is blended with the acrylic latex in an amount of from about 0.1 to about 5% on a total solids basis.
Claim 7
Dependent Claim
28 words
A method as defined in claim 5 wherein the copolymer latex is blended in an amount ranging from about 0.5 to about 2% on a total solids basis.
References Cited (Backward Citations)
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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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |