US4535101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide of 2,2-bis(4-(4-aminophenoxy)phenyl)-hexafluoropropane and process for the preparation of same
Assignee: Imi Tech Corp
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Filing: 1984-04-03
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Granted: 1985-08-13
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Expires: 2004-04-03
Abstract
Abstract A polyimide and a process for its preparation wherein the polyimide is prepared from reaction of an organic tetracarboxylic acid or derivative thereof with a mixture of an aromatic diamine and an amine-terminated fluoroether. The polyimides of the invention are particularly useful in the preparation of flexible foams.
Inventors
- 👤 Raymond Lee
- 👤 Usman A. K. Sorathia
- 👤 Gregory A. Ferro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1046; C08G73/105; C08G73/1085; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A polyimide foam prepared by reaction of an organic tetracarboxylic acid ester with (a) a diamine having the formula: ##STR5## (b) at least one amine having the formula: H.sub.2 N--R--NH.sub.2 wherein R is an aromatic group containing 5 to 16 carbon atoms.
Claim 2
Dependent Claim
42 words
A polyimide foam prepared by reaction of an organic tetracarboxylic acid ester with (a) a diamine having the formula: ##STR5## (b) at least one amine having the formula: H.sub.2 N--R--NH.sub.2 wherein R is an aromatic group containing 5 to 16 carbon atoms.
Claim 3
Dependent Claim
45 words
A polyimide foam as defined in claim 1 wherein the tetracarboxylic acid derivative is a compound having the formula: ##STR6## wherein A is a tetravalent organic group and R 1 to R 4 are each selected from the group consisting of hydrogen and lower alkyl.
Claim 4
Dependent Claim
15 words
A polyimide foam as defined in claim 1 which includes at least one heterocyclic diamine.
Claim 5
Dependent Claim
15 words
A polyimide foam as defined in claim 1 which includes at least one aliphatic diamine.
Claim 6
Dependent Claim
33 words
A polyimide foam as defined in claim 3 wherein the heterocyclic diamine contains up to one hetero atom in the ring, the hetero atom being selected from the group --N--, --O-- and --S--.
Claim 7
Dependent Claim
60 words
A process for the preparation of a polyimide foam comprising reacting an organic tetracarboxylic acid ester with (a) a diamine having the formula: ##STR7## and (b) at least one amine having the formula: H.sub.2 N--R--NH.sub.2 wherein R is an aromatic group containing 5 to 16 carbon atoms, and heating the reaction mixture to polymerize and convert it to a foam.
Claim 8
Dependent Claim
60 words
A process for the preparation of a polyimide foam comprising reacting an organic tetracarboxylic acid ester with (a) a diamine having the formula: ##STR7## and (b) at least one amine having the formula: H.sub.2 N--R--NH.sub.2 wherein R is an aromatic group containing 5 to 16 carbon atoms, and heating the reaction mixture to polymerize and convert it to a foam.
Claim 9
Dependent Claim
21 words
A process as defined in claim 6 wherein the organic tetracarboxylic acid ester is a di(lower alkyl)ester of benzophenone tetracarboxylic acid.
Claim 10
Dependent Claim
20 words
A polyimide foam as defined in claim 1 wherein the tetracarboxylic acid ester is a di(loweralkyl)ester of benzophenone tetracarboxylic acid.
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |