US4011198A
Expired / Lapsed
US
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Method for making polyetherimides
Assignee: General Electric Co
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Filing: 1975-02-13
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Granted: 1977-03-08
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Expires: 1995-02-13
Abstract
Abstract A process for making polyetherimides is provided by melt polymerizing a mixture of organic diamines and certain aromatic bis(etherdicarbonyl) compounds such as aromatic tetra-carboxylic acids and dianhydrides thereof. The polyetherimides can be made in a continuous manner. Fillers can be incorporated into the polyetherimides to produce high performance composites.
Inventors
- 👤 Tohru Takekoshi
- 👤 John E. Kochanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:32
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G73/1046; C08G73/1053; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A continuous method for making polyetherimide which comprises, continuously feeding into an extruder maintained at melt polymerization temperatures, a mixture containing as essential ingredients an organic diamine of the formula, H.sub.2 NR.sup.1 NH.sub.2, and an aromatic bis(etherdicarbonyl) compound selected from the class consisting of dianhydride of the formula, ##STR12## and tetra-carboxylic acid of the formula, ##STR13## and continuously venting water of reaction therefrom at temperatures up to 350° C, where R is a divalent aromatic organic radical having from 6-30 carbon atoms, R 1 is a divalent organic radical selected from R radicals, alkylene radicals having from 2-20 carbon atoms, cycloalkylene radicals, and C.sub.(2-8) alkylene terminated polydiorganosiloxane radicals.
Claim 2
Dependent Claim
108 words
A continuous method for making polyetherimide which comprises, continuously feeding into an extruder maintained at melt polymerization temperatures, a mixture containing as essential ingredients an organic diamine of the formula, H.sub.2 NR.sup.1 NH.sub.2, and an aromatic bis(etherdicarbonyl) compound selected from the class consisting of dianhydride of the formula, ##STR12## and tetra-carboxylic acid of the formula, ##STR13## and continuously venting water of reaction therefrom at temperatures up to 350° C, where R is a divalent aromatic organic radical having from 6-30 carbon atoms, R 1 is a divalent organic radical selected from R radicals, alkylene radicals having from 2-20 carbon atoms, cycloalkylene radicals, and C.sub.(2-8) alkylene terminated polydiorganosiloxane radicals.
Claim 3
Dependent Claim
16 words
A method in accordance with claim 1, using a mixture of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and 4,4'-diaminodiphenyl ether.
Claim 4
Dependent Claim
17 words
A method in accordance with claim 1, using a mixture of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and meta phenylene diamine.
References Cited (Backward Citations)
US3803085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |