US4049637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer prepared from hydrazine and tricarboxylic acid derivatives and method of preparation
Assignee: PPG Industries Inc
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Filing: 1976-11-16
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Granted: 1977-09-20
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Expires: 1996-11-16
Abstract
Abstract Novel polymers formed from the reaction of tricarboxylic anhydrides and hydrazines or hydrazides which may be cross-linkable by further reaction with a hydrazine or hydrazide are disclosed.
Inventors
- 👤 Karl F. Schimmel
- 👤 Marco Wismer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/028; C08G73/0293
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
The method of producing a high temperature polymer comprising mixing a tricarboxylic monoanhydride with a monofunctional alcohol and heating at reflux the mixture so formed to thereby form an ester-acid having the structural formula: ##STR12## mixing said ester acid with a sufficient amount of a member selected from the group consisting of a hydrazine and a hydrazide, to thereby form a polysalt having the structural formula: ##STR13## and heating said polysalt at a temperature sufficient to form a high temperature resistant polymer having the structural formula: ##STR14## where R is a trivalent organic radical having at least two carbon atoms; R 1 is a divalent organic radical having at least two carbon atoms; R 2 and R 3 are selected from the group consisting of alkyl, aryl, aralkyl, cycloalkyl, and hydrogen radicals and x and y are either 1 or 0.
Claim 2
Independent Claim
141 words
The method of producing a high temperature polymer comprising mixing a tricarboxylic monoanhydride with a monofunctional alcohol and heating at reflux the mixture so formed to thereby form an ester-acid having the structural formula: ##STR12## mixing said ester acid with a sufficient amount of a member selected from the group consisting of a hydrazine and a hydrazide, to thereby form a polysalt having the structural formula: ##STR13## and heating said polysalt at a temperature sufficient to form a high temperature resistant polymer having the structural formula: ##STR14## where R is a trivalent organic radical having at least two carbon atoms; R 1 is a divalent organic radical having at least two carbon atoms; R 2 and R 3 are selected from the group consisting of alkyl, aryl, aralkyl, cycloalkyl, and hydrogen radicals and x and y are either 1 or 0.
Claim 3
Dependent Claim
77 words
The reaction product of an organic condensation polymer consisting essentially of the repeating structural formula: ##STR15## reacted with a compound of the repeating structural formula: ##STR16## wherein R 1 is a divalent organic radical selected from the group consisting of alkylene, arylene, alkylarylene; R is a ketone or aliphatic chloro, bromo, or iodo functional, R 2 and R 3 are monovalent alkyl, aryl, aralkyl, cycloalkyl radicals or hydrogen and x and y are either 1 or 0.
Claim 4
Dependent Claim
77 words
The reaction product of an organic condensation polymer consisting essentially of the repeating structural formula: ##STR15## reacted with a compound of the repeating structural formula: ##STR16## wherein R 1 is a divalent organic radical selected from the group consisting of alkylene, arylene, alkylarylene; R is a ketone or aliphatic chloro, bromo, or iodo functional, R 2 and R 3 are monovalent alkyl, aryl, aralkyl, cycloalkyl radicals or hydrogen and x and y are either 1 or 0.
References Cited (Backward Citations)
US3360502A
Cited
JPS4537688B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |