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US3669939A
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Condensation polymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-07-06
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Granted: 1972-06-13
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Expires: 1990-07-06
Abstract
Abstract Polymers are prepared by condensing a polyhydroxy monocarboxylic acid of formula (OH)nR-COOH, wherein n is an integer from two to six and R is a hydrocarbon radical containing up to 22 carbon atoms to which the hydroxyl groups are attached and optionally interrupted by or containing a hetero atom, with other condensable species which exclude those containing more than one carboxyl group or a group equivalent to more than one carboxyl group. The polymer per se or when attached to another moiety are useful in coating compositions.
Inventors
- 👤 Alan Stuart Baker
- 👤 Derek John Walbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:39
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A condensation polymer according to claim 1 wherein the polyhydroxymonocarboxylic acid is selected form the group consisting of dimethylol propionic acid, dimethylol butyric acid, dimethylol valeric acid and trimethylol acetic acid.
Claim 2
Dependent Claim
23 words
A condensation polymer according to claim 1 wherein the other mono-carboxylic acid which also contains a single complementary reactive group is 12-hydroxystearic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |