Patent FR1034170A successfully refreshed from Google Patents.
US3896089A
Expired / Lapsed
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Solution for forming thermal resisting polymers
Assignee: Nitto Denko Corp
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Filing: 1973-04-04
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Granted: 1975-07-22
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Expires: 1993-04-04
Abstract
Abstract A concentrated solution suitable for forming thermal resisting polymers having a high degree of polymerization comprising a mixture of a prepolymer solution prepared by the reaction of an organic diisocyanate or diamine and a molar excess of 1,2,3,4butanetetracarboxylic acid or an anhydride of the acid, and a blocked polyisocyanate.
Inventors
- 👤 Yuzuru Noda
- 👤 Makoto Kojima
- 👤 Shiro Mazaki
- 👤 Yasutada Katashiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1035; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/34; C08G18/343; C08G18/346; C08G18/38; C08G18/3819; C08G18/3821; C08G18/40; C08G18/64; C08G18/6415; C08G18/6438; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8048
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A SOLUTION FOR FORMING THERMAL RESISTING POLYMERS COMPRISING A MIXTURE OF A PREPOLYMER SOLUTION AND BLOCKED POLYISOCYANATE COMPOUND IN AN APPROXIMATELY STOICHIOMETRIC EQUIVALENT AMOUNT TO SAID PREPOLYMER, SAID PREPOLYYMER HAVING BEEN PREPARED BY REACTING AN ORGANIC DIISOCYANATE OR DIAMINE AND A MOLAR EXCESS OF 1,2,3,4-BUTANE-TETRACARBOXYLIC ACID OR AN ANHYDRIDE THEREOF AND THE PREPOLYMER HAVING AN IMIDE GROUP IN THE MAIN CHAIN OF THE MOLECULE AND AN ACID GROUP AT THE TERMINALS OF SAID MOLECULE, WHEREIN SAID BLOCKED POLYISOCYANATE IS A BLOCKED COMPOUND, OF A POLYISOCYANATE HAVING A HYDANTOIN RING IN THE MAIN CHAIN OF THE MOLECULE, AND HAVING ISOCYANATE GROUPS AT BOTH TERMINALS OF THE MOLECULE PREPARED BY REACTING THE GLYCINE DERIVATIVED REPRESENTED BY THE GENERAL FORMULA
Claim 2
Dependent Claim
117 words
A SOLUTION FOR FORMING THERMAL RESISTING POLYMERS COMPRISING A MIXTURE OF A PREPOLYMER SOLUTION AND BLOCKED POLYISOCYANATE COMPOUND IN AN APPROXIMATELY STOICHIOMETRIC EQUIVALENT AMOUNT TO SAID PREPOLYMER, SAID PREPOLYYMER HAVING BEEN PREPARED BY REACTING AN ORGANIC DIISOCYANATE OR DIAMINE AND A MOLAR EXCESS OF 1,2,3,4-BUTANE-TETRACARBOXYLIC ACID OR AN ANHYDRIDE THEREOF AND THE PREPOLYMER HAVING AN IMIDE GROUP IN THE MAIN CHAIN OF THE MOLECULE AND AN ACID GROUP AT THE TERMINALS OF SAID MOLECULE, WHEREIN SAID BLOCKED POLYISOCYANATE IS A BLOCKED COMPOUND, OF A POLYISOCYANATE HAVING A HYDANTOIN RING IN THE MAIN CHAIN OF THE MOLECULE, AND HAVING ISOCYANATE GROUPS AT BOTH TERMINALS OF THE MOLECULE PREPARED BY REACTING THE GLYCINE DERIVATIVED REPRESENTED BY THE GENERAL FORMULA
Claim 3
Dependent Claim
32 words
The solution for forming thermal resisting polymers as claimed in claim 1 comprising hydantoic acid or a lower alkyl ester thereof as a part of the blocked polyisocyanate having a hydantoin ring.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |