US4539342A
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US
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Polyimide foam prepared from amino terminated butadiene acrylonitrile reactant
Assignee: Imi Tech Corp
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Filing: 1984-04-03
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Granted: 1985-09-03
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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 butadiene-nitrile copolymer. The polyimides of the invention are particularly useful in the preparation of flexible foams.
Inventors
- 👤 Raymond Lee
- 👤 David W. Okey
- 👤 Gregory A. Ferro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1042; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A polyimide foam prepared from a polyamide-acid/ester prepolymer synthesized by reaction of an organic tetracarboxylic acid ester derivative with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula: ##STR5## wherein R is either a phenylene group or an alkylene group, R 1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms.
Claim 2
Dependent Claim
104 words
A polyimide foam prepared from a polyamide-acid/ester prepolymer synthesized by reaction of an organic tetracarboxylic acid ester derivative with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula: ##STR5## wherein R is either a phenylene group or an alkylene group, R 1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 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 wherein the aromatic diamine is methylene dianiline.
Claim 5
Dependent Claim
20 words
A polyimide foam as defined in claim 1 which includes at least one aromatic and at least one heterocyclic diamine.
Claim 6
Dependent Claim
15 words
A polyimide foam as defined in claim 1 which includes at least one aliphatic diamine.
Claim 7
Dependent Claim
117 words
A process for the preparation of a polyimide foam comprising reacting an organic tetracarboxylic acid ester with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula: ##STR7## wherein R is either a phenylene group or an alkylene group, R 1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and heating the resulting mixture to polymerize the mixture and convert it to a foam.
Claim 8
Dependent Claim
117 words
A process for the preparation of a polyimide foam comprising reacting an organic tetracarboxylic acid ester with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula: ##STR7## wherein R is either a phenylene group or an alkylene group, R 1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula: H.sub.2 N--R.sub.2 --NH.sub.2 wherein R 2 is an aromatic group containing 5 to 16 carbon atoms, and heating the resulting mixture to polymerize the mixture and convert it to a foam.
Claim 9
Dependent Claim
20 words
A polyimide foam as defined in claim 1 wherein the organic tetracarboxylic acid/ester is a di(loweralkyl)ester of benzophenone tetracarboxylic acid.
Claim 10
Dependent Claim
20 words
A polyimide foam as defined in claim 1 wherein the liquid diamine is an amine-terminated copolymer of butadiene and acrylonitrile.
Claim 11
Dependent Claim
19 words
A process as defined in claim 6 which includes a blowing agent to convert the polymer to a foam.
References Cited (Backward Citations)
US4332656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |