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US4302575A
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Heat curable polyimides
Assignee: General Electric Co
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Filing: 1979-12-26
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Granted: 1981-11-24
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Expires: 1999-12-26
Abstract
Abstract Polyetheramide acids and polyetherimides derived therefrom are provided having terminal aliphatically unsaturated groups. The polyetherimides are heat curable, have superior flow characteristics prior to cure, and can be converted to high strength shaped composites when reinforced with various materials such as carbon fibers, glass fibers, etc.
Inventors
- 👤 Tohru Takekoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1053; C08G73/1057; C08G73/1064; C08G73/1067; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
Heat curable polyimide compositions having improved processability at a temperature in the range of from 150° C. to 190° C. prior to curing comprising polyetherimide having terminal aliphatically unsaturated groups of the formula, ##STR14## which consists essentially of chemically combined units selected from ##STR15## and mixtures thereof, where R is a divalent aliphatically unsaturated organo radical selected from hydrocarbon radicals and halogenated hydrocarbon radicals, R 1 is a C.sub.(6-30) divalent aromatic organic radical and R 2 is a divalent organic radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms, and (c) divalent radicals included by the formula, ##STR16## where Q is a member selected from the class consisting of ##STR17## and x is a whole number from 1 to 5 inclusive.
Claim 2
Dependent Claim
143 words
Heat curable polyimide compositions having improved processability at a temperature in the range of from 150° C. to 190° C. prior to curing comprising polyetherimide having terminal aliphatically unsaturated groups of the formula, ##STR14## which consists essentially of chemically combined units selected from ##STR15## and mixtures thereof, where R is a divalent aliphatically unsaturated organo radical selected from hydrocarbon radicals and halogenated hydrocarbon radicals, R 1 is a C.sub.(6-30) divalent aromatic organic radical and R 2 is a divalent organic radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals and cycloalkylene radicals having from 2-20 carbon atoms, and (c) divalent radicals included by the formula, ##STR16## where Q is a member selected from the class consisting of ##STR17## and x is a whole number from 1 to 5 inclusive.
Claim 3
Dependent Claim
13 words
A heat curable composition in accordance with claim 1, where R is ##STR18##
Claim 4
Dependent Claim
14 words
A heat curable composition in accordance with claim 1, where R 1 is ##STR19##
Claim 5
Dependent Claim
13 words
A heat curable composition in accordance with claim 1, where R is ##STR20##
Claim 6
Dependent Claim
13 words
A heat curable composition in accordance with claim 1, where R is ##STR21##
Claim 7
Dependent Claim
14 words
A heat curable composition in accordance with claim 1, where R 2 is ##STR22##
Claim 8
Dependent Claim
18 words
A heat curable composition in accordance with claim 1, where R 2 is a member selected from ##STR23##
Claim 9
Dependent Claim
14 words
A heat curable composition in accordance with claim 1, where R 2 is ##STR24##
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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) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |