Patent US3962191A successfully refreshed from Google Patents.
US3962191A
Expired / Lapsed
US
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Linear isocyanurate polyesters and processes for preparing same
Assignee: Armstrong World Industries Inc
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Filing: 1974-12-31
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Granted: 1976-06-08
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Expires: 1994-12-31
Abstract
Abstract Phenylisocyanuric acid is reacted with acrylonitrile in the presence of N-benzyltrimethyl ammonium hydroxide; 40% in methanol, in an inert solvent at 75°C. to 150°C. to produce 1,3-bis(2-cyanoethyl)-5-phenylisocyanurate. The 1,3-bis(2-cyanoethyl)-5-phenylisocyanurate is then heated with a mineral acid to produce 1,3-bis(2-carboxyethyl-5-phenylisocyanurate. A novel polyester of the formula ##SPC1## Is made wherein N=2, M is a diol having at least two carbon atoms, and X is a whole number greater than 1 by condensing 1,3-bis(2-carboxyethyl)-5-phenylisocyanurate with a polyol such as 1,6-hexanediol.
Inventors
- 👤 William J. Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A process for preparing a novel polyester which comprises reacting phenylisocyanuric acid with acrylonitrile in the presence of N-benzyltrimethyl ammonium hydroxide; 40% in methanol, in an inert reaction medium at a temperature of about 75°C. to 150°C. to form the intermediate 1,3-bis(2-cyanoethyl)-5-phenylisocyanurate, hydrolyzing said intermediate in the presence of an acid to yield 1,3-bis(2-carboxyethyl)-5-phenylisocyanurate, and condensing 1,3-bis(2-carboxyethyl)-5-phenylisocyanurate with a diol of two to ten carbon atoms.
Claim 2
Dependent Claim
66 words
A process for preparing a novel polyester which comprises reacting phenylisocyanuric acid with acrylonitrile in the presence of N-benzyltrimethyl ammonium hydroxide; 40% in methanol, in an inert reaction medium at a temperature of about 75°C. to 150°C. to form the intermediate 1,3-bis(2-cyanoethyl)-5-phenylisocyanurate, hydrolyzing said intermediate in the presence of an acid to yield 1,3-bis(2-carboxyethyl)-5-phenylisocyanurate, and condensing 1,3-bis(2-carboxyethyl)-5-phenylisocyanurate with a diol of two to ten carbon atoms.
Claim 3
Dependent Claim
14 words
The process in accordance with claim 1 wherein the inert reaction medium is dimethylformamide.
Claim 4
Dependent Claim
12 words
A process in accordance with claim 1 wherein said diol is 1,6-hexanediol.
References Cited (Backward Citations)
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US3370045A
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US3485833A
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US3331839A
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US3407200A
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |