US4814357A
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Polyimide foams and their preparation
Assignee: Ethyl Corp
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Filing: 1988-08-01
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Granted: 1989-03-21
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Expires: 2008-08-01
Abstract
Abstract Described are flexible polyimide foams having enhanced compression fatique life and softness for use in the manufacture of seat cushions and methods for the production of such foams and precursors therefor. These foams are produced from novel polyimides prepared by reaction of an organic tetracarboxylic acid or derivative thereof, preferably an ester with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at least one aromatic or heterocyclic primary diamine. Foams can be produced having (a) a fatigue life as determined by ASTM test procedure D3574-81 using foam specimens from three to five inches in thickness of at least 15,000 cycles, or (b) an indentation force deflection as determined by ASTM test procedure D3574-81 on foam specimens of one-inch thickness of less than 40 pounds of force at 25% deflection and less than 180 pounds of force at 65% deflection, or both of (a) and (b).
Inventors
- 👤 David M. Indyke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:05
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16; C08G73/1003; C08G73/1007; C08G73/1046; C08G73/1057; C08G73/106; C08G73/1064; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
49 words
A polyimide prepared by reaction of an organic tetracarboxylic acid or anhydride or ester with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at leaat one aromatic or heterocyclic primary diamine.
Claim 2
Dependent Claim
49 words
A polyimide prepared by reaction of an organic tetracarboxylic acid or anhydride or ester with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at leaat one aromatic or heterocyclic primary diamine.
Claim 3
Dependent Claim
31 words
A polyimide of claim 1 wherein the polymethylene glycol contains 3 to 8 carbon atoms in the molecule and the aromatic or heterocyclic primary amine includes 4,4'-methylene-dianiline or 4,4'-oxydianiline, or both.
Claim 4
Dependent Claim
12 words
A polyimide of claim 2 wherein the primary amine further includes 2,6-diaminopyridine.
Claim 5
Dependent Claim
14 words
A polyimide of claim 2 wherein the primary amine further includes amino-terminated butadiene-acrylonitrile copolymer.
Claim 6
Dependent Claim
48 words
A polyimide prepared by reaction of an aromatic tetracarboxylic acid or derivative thereof with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at least one aromatic or heterocyclic primary diamine.
Claim 7
Dependent Claim
48 words
A polyimide prepared by reaction of an aromatic tetracarboxylic acid or derivative thereof with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at least one aromatic or heterocyclic primary diamine.
Claim 8
Dependent Claim
29 words
A polyimide of claim 5 wherein said diester is a diester of an amino-substituted benzoic acid and a polymethylene glycol containing 3 to 8 carbon atoms in the molecule.
Claim 9
Dependent Claim
12 words
A polyimide of claim 5 wherein said diester is trimethylene glycol di-p-aminobenzoate.
Claim 10
Dependent Claim
19 words
A polyimide of claim 5 wherein the aromatic tetracarboxylic acid or derivative thereof is a aromatic tetracarboxylic acid dianhydride.
Claim 11
Dependent Claim
18 words
A polyimide of claim 5 wherein the aromatic tetracarboxylic acid or derivative thereof is benzophenone tetracarboxylic acid dianhydride.
Claim 12
Dependent Claim
24 words
A polyimide of claim 5 wherein said aromatic tetracarboxylic acid or derivative thereof is predominantly a di(lower alkyl) ester of an aromatic tetracarboxylic acid.
Claim 13
Dependent Claim
25 words
A polyimide of claim 5 wherein said aromatic tetracarboxylic acid or derivative thereof is predominantly is the dimethyl or diethyl ester of benzophenone tetracarboxylic acid.
Claim 14
Dependent Claim
44 words
A polyimide of claim 5 wherein the aromatic tetrabocylic acid or derivative thereof is a aromatic tetracarboxylic acid dianhydride, and wherein said diester is a diester of an amino-substituted benzoic acid and a polymethylene glycol containing 3 to 8 carbon atoms in the molecule.
Claim 15
Dependent Claim
32 words
A polyimide of claim 12 wherein the aromatic or heterocyclic primary amine includes 4,4,-methylenedianiline or 4,4,'-oxydianiline, or both and optionally the reaction mixture further includes a diaminopyridine or an amino-terminated butadiene-acrylonitrile reactant.
Claim 16
Dependent Claim
43 words
A polyimide of claim 5 wherein the aromatic tetracarboxylic acid or derivative thereof is benzophenone tetracarboxylic acid dianhydride and wherein said diester is a diester of an amino-substituted benzoic acid and a polymethylene glycol containing 3 to 8 carbon atoms in the molecule.
Claim 17
Dependent Claim
32 words
A polyimide of claim 14 wherein the aromatic or heterocyclic primary amine includes 4,4,'-methylenedianiline or 4,4,'-oxydianiline, or both and optionally the reaction mixture further includes a diaminopyridine or an amino-terminated butadiene-acrylonitrile reactant.
Claim 18
Dependent Claim
16 words
A polyimide of claim 5 wherein the reaction is conducted in the presence of a surfactant.
Claim 19
Dependent Claim
19 words
A polyimide of claim 5 wherein the reaction involves about 20 to about 50 mol percent of said diester.
Claim 20
Dependent Claim
31 words
A polyimide of claim 5 prepared by reaction of benzophenone tetracarboxylic acid or derivative thereof, trimethylene glycol di-p-aminobenzoate, 4,4'methylenedianiline or 4,4'-oxydianiline, or both, and optionally a diaminopyridine or amino-terminated butadiene-acrylonitrile reactant.
Claim 21
Dependent Claim
51 words
A process of preparing a polyimide which comprises reacting an organic tetracarboxylic acid or derivative thereof with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at least one aromatic or heterocyclic primary diamine.
Claim 22
Dependent Claim
51 words
A process of preparing a polyimide which comprises reacting an organic tetracarboxylic acid or derivative thereof with (a) about 1 to about 50 mol percent of a diester of (i) a primary amino-substituted aromatic carboxylic acid, and (ii) a polymethylene glycol, and (b) at least one aromatic or heterocyclic primary diamine.
Claim 23
Dependent Claim
19 words
A process of claim 19 wherein the organic tetracarboxylic acid or derivative thereof is an aromatic tetracarboxylic acid dianhydride.
Claim 24
Dependent Claim
18 words
A process of claim 19 wherein the organic tetracarboxylic acid or derivative thereof is benzophenone tetracarboxylic acid dianhydride.
Claim 25
Dependent Claim
29 words
A process of claim 19 wherein said diester is a diester of an amino-substituted benzoic acid and a polymethylene glycol containing 3 to 8 carbon atoms in the molecule.
Claim 26
Dependent Claim
12 words
A process of claim 19 wherein said diester is trimethylene glycol di-p-aminobenzoate.
Claim 27
Dependent Claim
32 words
A process of claim 19 wherein the aromatic or heterocyclic primary amine includes 4,4'-methylenedianiline or 4,4'-oxydianiline, or both, and optionally, wherein the reaction mixture further includes a diaminopyridine or amino-terminated butadiene-acrylonitrile copolymer.
Claim 28
Dependent Claim
43 words
A process of claim 24 wherein the organic tetracarboxylic acid or derivative thereof is benzophenone tetracarboxylic acid dianhydride and wherein said diester is a diester of an amino-substituted benzoic acid and a polymethylene glycol containing 3 to 8 carbon atoms in the molecule.
Claim 29
Dependent Claim
12 words
A process of claim 25 wherein said diester is trimethylene glycol di-p-aminobenzoate.
Claim 30
Dependent Claim
19 words
A process of claim 19 wherein the reaction is conducted in the presence of at least a flame retardant.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |