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US3917643A
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US
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Method for making polyetherimides and products produced thereby
Assignee: General Electric Co
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Filing: 1973-06-22
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Granted: 1975-11-04
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Expires: 1993-06-22
Abstract
Abstract A method is provided for making polyetherimides involving the reaction of aromatic bis(ether anhydride)s and organic diamines in the presence of a phenolic solvent. The resulting polyetherimide-phenolic solvent mixture can be employed as a wire coating enamel.
Inventors
- 👤 Tohru Takekoshi
- 👤 John E Kochanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:03
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
8 words
A METHOD FOR MAKING A POLYETHERIMIDE WHICH COMPRISES,
Claim 2
Independent Claim
8 words
A METHOD FOR MAKING A POLYETHERIMIDE WHICH COMPRISES,
Claim 3
Dependent Claim
9 words
EFFECTING REACTION BETWEEN AROMATIC BIS(ETHER ANHYDRIDE) OF THE FORMULA
Claim 4
Dependent Claim
9 words
EFFECTING REACTION BETWEEN AROMATIC BIS(ETHER ANHYDRIDE) OF THE FORMULA
Claim 5
Dependent Claim
24 words
separating said polyetherimide from the resulting mixture of (1), where R is selected from the class consisting of a. the following divalent organic radicals,
Claim 6
Dependent Claim
24 words
separating said polyetherimide from the resulting mixture of (1), where R is selected from the class consisting of a. the following divalent organic radicals,
Claim 7
Dependent Claim
13 words
A method in accordance with claim 1 where the aromatic bis(ether anhydride) is
Claim 8
Dependent Claim
35 words
SEPARATING SAID POLETHERIMIDE FROM THE RESULTING MIXTURE OF (1) WHERE R IS SELECTED FROM THE CLASS CONSISTING OF A. THE FOLLOWING DIVALENT ORGANIC RADICALS, -1,3-PHENYLENE-, -1,4-PHENYLENE-, AND (B) DIVALENT ORGANIC RADICALS OF THE GENERAL FORMULA
Claim 9
Dependent Claim
35 words
SEPARATING SAID POLETHERIMIDE FROM THE RESULTING MIXTURE OF (1) WHERE R IS SELECTED FROM THE CLASS CONSISTING OF A. THE FOLLOWING DIVALENT ORGANIC RADICALS, -1,3-PHENYLENE-, -1,4-PHENYLENE-, AND (B) DIVALENT ORGANIC RADICALS OF THE GENERAL FORMULA
Claim 10
Dependent Claim
13 words
A method in accordance with claim 1 where the aromatic bis(ether anhydride) is
Claim 11
Dependent Claim
20 words
A method in accordance with claim 1 where water of reaction is separated by the use of azeotroping organic solvent.
Claim 12
Dependent Claim
14 words
A method in accordance with claim 1 where the organic diamine is methylene dianiline.
Claim 13
Dependent Claim
13 words
A method in accordance with claim 1 where the organic diamine is oxydianiline.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |