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US4716216A
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Crystalline polyimides containing cumulative phenylene sulfide units
Assignee: General Electric Co
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Filing: 1986-11-19
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Granted: 1987-12-29
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Expires: 2006-11-19
Abstract
Abstract Crystalline polyimides having low glass transition temperatures and high solvent resistance are obtained by reacting diamino-oligo-phenylene sulfides with aromatic tetracarboxylic acids or their anhydride derivatives. The diamino-oligo-phenylene sulfides can be of varying length and can be reacted with the dianhydride by conventional processes.
Inventors
- 👤 Tohru Takekoshi
- 👤 Patricia P. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1057; C08G73/1064
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A crystalline polyimide consisting essentially of structural units of the formula ##STR13## wherein A is the tetravalent aromatic nucleus of a dianhydride selected from the group consisting of pyromellitic dianhydride; biphenyl-3,3',4,4'-tetracarboxylic dianhydride; 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride; and benzophenone-3,3',4,4'-tetracarboxylic dianhydride; i is a whole number of from 2 to 6 and n is a whole number of at least 5.
Claim 2
Dependent Claim
57 words
A crystalline polyimide consisting essentially of structural units of the formula ##STR13## wherein A is the tetravalent aromatic nucleus of a dianhydride selected from the group consisting of pyromellitic dianhydride; biphenyl-3,3',4,4'-tetracarboxylic dianhydride; 1,4-bis(3,4-dicarboxyphenoxy)benzene dianhydride; and benzophenone-3,3',4,4'-tetracarboxylic dianhydride; i is a whole number of from 2 to 6 and n is a whole number of at least 5.
Claim 3
Dependent Claim
25 words
The polyimide polymer of claim 1 containing therein the residue of a diamine selected from the group consisting of 1,4-bis(4-aminophenylthio)benzene, 4,4'-bis(4-aminophenylthio)diphenylsulfide, 1,4-bis[4-(4-aminophenylthio)phenylthio]benzene, 4,4'-bis[4-(4-aminophenylthio)phenylthio]diphenylsulfide, and 1,4-bis[4-(4-{4-aminophenylthio}phenylthio)phenylthio]benzene.
Claim 4
Dependent Claim
26 words
A polyamic acid precursor to the polyimide polymer of claim 1 having the formula ##STR14## wherein A, i and n are as defined in claim 1.
Claim 5
Dependent Claim
20 words
The polyimide polymer of claim 1 wherein n is a value in the range of about 30 to about 1000.
Claim 6
Dependent Claim
14 words
The polyimide polymer of claim 1 having an equilibrium melting temperature below 375° C.
Claim 7
Dependent Claim
97 words
A crystalline polyimide consisting essentially of structural units of the formula ##STR15## wherein A is the tetravalent aromatic nucleus of a dianhydride selected from the group consisting of pyromellitic dianhydride; biphenyl-3,3',4,4'-tetracarboxylic dianhydride; 3,3',4,4'-tetracarboxydiphenylsulfide dianhydride; 1,4-bis[3,4-dicarboxyphenoxy]benzene dianhydride; 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride; benzophenone-3,3'-4,4'-tetracarboxylic dianhydride and diphenyl ether-3,3',4,4'-tetracarboxylic dianhydride; wherein n is a whole number of at least 5; and wherein i is a whole number of from 2 to 6 for said pyromellitic dianhydride, biphenyl-3,3',4,4'-tetracarboxylic dianhydride, and benzophenone-3,3',4,4'-tetracarboxylic dianhydride; i is 2, 3, 5 or 6 for 3,3',4,4'-tetracarboxydiphenylsulfide dianhydride; and i is 2, 4, 5 or 6 for diphenyl ether-3,3',4,4'-tetracarboxylic dianhydride.
Claim 8
Dependent Claim
97 words
A crystalline polyimide consisting essentially of structural units of the formula ##STR15## wherein A is the tetravalent aromatic nucleus of a dianhydride selected from the group consisting of pyromellitic dianhydride; biphenyl-3,3',4,4'-tetracarboxylic dianhydride; 3,3',4,4'-tetracarboxydiphenylsulfide dianhydride; 1,4-bis[3,4-dicarboxyphenoxy]benzene dianhydride; 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride; benzophenone-3,3'-4,4'-tetracarboxylic dianhydride and diphenyl ether-3,3',4,4'-tetracarboxylic dianhydride; wherein n is a whole number of at least 5; and wherein i is a whole number of from 2 to 6 for said pyromellitic dianhydride, biphenyl-3,3',4,4'-tetracarboxylic dianhydride, and benzophenone-3,3',4,4'-tetracarboxylic dianhydride; i is 2, 3, 5 or 6 for 3,3',4,4'-tetracarboxydiphenylsulfide dianhydride; and i is 2, 4, 5 or 6 for diphenyl ether-3,3',4,4'-tetracarboxylic dianhydride.
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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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |