US3989670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyetherimides
Assignee: General Electric Co
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Filing: 1974-02-06
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Granted: 1976-11-02
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Expires: 1994-02-06
Abstract
Abstract A process for making polyetherimides is provided by melt polymerizing a mixture of certain aromatic bis(etheranhydride)s and organic diamines. The polyetherimides can be reinforced with various fillers to produce high performance composites.
Inventors
- 👤 Tohru Takekoshi
- 👤 John E. Kochanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1042; C08G73/1046; C08G73/1053
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A method for making polyetherimide which comprises effecting the removal of water of reaction at temperatures of from about 250° C to a temperature below about 400° C by using either stirring, an inert gas purge, or reduced pressure, from the melt of a mixture containing as essential ingredients m-phenylene diamine and aromatic bis(etheranhydride) selected from the class consisting of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride, 2,2-bis[4-(2,3-dicarboxyphenoxy)phenyl]propane dianhydride, and 2-[4-(2,3-dicarboxyphenoxy)phenyl]-2-[ 4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and mixtures thereof, where there is utilized from 0.5 to 2.0 moles of m-phenylene diamine per mole of aromatic bis(etheranhydride).
Claim 2
Independent Claim
88 words
A method for making polyetherimide which comprises effecting the removal of water of reaction at temperatures of from about 250° C to a temperature below about 400° C by using either stirring, an inert gas purge, or reduced pressure, from the melt of a mixture containing as essential ingredients m-phenylene diamine and aromatic bis(etheranhydride) selected from the class consisting of 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride, 2,2-bis[4-(2,3-dicarboxyphenoxy)phenyl]propane dianhydride, and 2-[4-(2,3-dicarboxyphenoxy)phenyl]-2-[ 4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and mixtures thereof, where there is utilized from 0.5 to 2.0 moles of m-phenylene diamine per mole of aromatic bis(etheranhydride).
Claim 3
Dependent Claim
21 words
A method in accordance with claim 1, where the aromatic bis(etheranhydride) and m-phenylene diamine are present in substantially equal molar amounts.
Claim 4
Dependent Claim
10 words
A method in accordance with claim 1, utilizing 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride.
Claim 5
Dependent Claim
10 words
A method in accordance with claim 1 employing 2,2-bis[4-(2,3-dicarboxyphenoxy)phenyl]propane dianhydride.
References Cited (Backward Citations)
US3179634A
Cited
US3624050A
Cited
US3838101A
Cited
US3649601A
Cited
US3699075A
Cited
US3803085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |