US4138380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of copolymer emulsions of an α,β-unsaturated carboxylic acid and methyl acrylate
Assignee: ISP Investments LLC
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Filing: 1977-02-18
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Granted: 1979-02-06
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Expires: 1997-02-18
Abstract
Abstract Copolymer emulsions comprising (1) an α,β-unsaturated carboxylic acid and (2) methyl acrylate are useful as thickening agents, particularly in acrylic polymer latices. An especially effective thickening agent is obtained when the copolymer emulsion is prepared using the dioctyl ester of sulfosuccinic acid as a surfactant.
Inventors
- 👤 Eugene S. Barabas
- 👤 Andrew Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:00
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F220/00; C08F220/02; C08F220/04; C08F220/10; C08F220/12; C08F220/14; C09; C09K; C09K23/00; C09K23/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
In a redox-initiated emulsion polymerization process for the preparation of a copolymer latex in which the copolymer comprises (1) from about 30% to about 75% by weight of methacrylic acid, ethacrylic acid or mixtures thereof and (2) from about 25% to about 70% by weight of methyl acrylate, in which all of the acid and the methyl acrylate is present in the reaction zone prior to initiation of the polymerization process, the improvement which comprises employing an effective emulsifying amount of the dioctyl ester of sulfosuccinic acid.
Claim 2
Dependent Claim
87 words
In a redox-initiated emulsion polymerization process for the preparation of a copolymer latex in which the copolymer comprises (1) from about 30% to about 75% by weight of methacrylic acid, ethacrylic acid or mixtures thereof and (2) from about 25% to about 70% by weight of methyl acrylate, in which all of the acid and the methyl acrylate is present in the reaction zone prior to initiation of the polymerization process, the improvement which comprises employing an effective emulsifying amount of the dioctyl ester of sulfosuccinic acid.
Claim 3
Dependent Claim
32 words
The improvement according to claim 1 in which the emulsifier is present in an amount ranging from about 0.5 wt.% to about 10 wt.% based on the total weight of the monomers.
Claim 4
Dependent Claim
24 words
The improvement according to claim 2 in which the emulsifier is present in an amount ranging from about 0.8 wt.% to about 5 wt.%.
References Cited (Backward Citations)
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Cited
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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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |