US4338427A
Expired / Lapsed
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Process for producing polyimide-amide-carboxylic acid
Assignee: Resonac Corp
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Filing: 1980-04-10
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Granted: 1982-07-06
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Expires: 2000-04-10
Abstract
Abstract Polyimide-amide-carboxylic acids produced by reacting an aromatic diamine with an aromatic tetracarboxylic acid dianhydride in amounts of 1.5 to 2.0 moles of the latter per mole of the former in the presence of an inert solvent, and reacting the resulting intermediate reaction product with an aromatic diisocyanate in about equivalent amounts at a temperature of 50° to 100° C. while removing generated carbon dioxide from the reaction system are good in heat resistance, wear resistance, chemical resistance, etc.
Inventors
- 👤 Iwao Maekawa
- 👤 Daisuke Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1035; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3821
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A process for producing a polyimide-amide-carboxylic acid which comprises (a) reacting an aromatic diamine with an aromatic tetracarboxylic acid dianhydride in amounts of 1.5 to 2.0 moles of the dianhydride per mole of the diamine in the presence of an inert solvent, and (b) reacting the resulting intermediate reaction product with an aromatic diisocyanate in about equivalent amounts at a temperature of 50° to 100° C. while removing generated carbon dioxide from the reaction system.
Claim 2
Dependent Claim
75 words
A process for producing a polyimide-amide-carboxylic acid which comprises (a) reacting an aromatic diamine with an aromatic tetracarboxylic acid dianhydride in amounts of 1.5 to 2.0 moles of the dianhydride per mole of the diamine in the presence of an inert solvent, and (b) reacting the resulting intermediate reaction product with an aromatic diisocyanate in about equivalent amounts at a temperature of 50° to 100° C. while removing generated carbon dioxide from the reaction system.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the reaction (a) is carried out at a temperature of 80° C. or lower.
Claim 4
Dependent Claim
28 words
A process according to claim 1, wherein the aromatic diamine is 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl sulfide, meta-phenylenediamine, para-phenylenediamine, 1,5-naphthalenediamine, 2,6-naphthalenediamine 4,4'-diaminodiphenyl ether-3-sulfonamide, 4,4'-diaminodiphenyl ether-3-carbonamide, or a mixture thereof.
Claim 5
Dependent Claim
38 words
A process according to claim 3, wherein the aromatic tetracarboxylic acid dianhydride is pyromellitic acid dianhydride, 3,3',4,4'-diphenyltetracarboxylic acid dianhydride, 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic acid dianhydride, 2,3,5,6-naphthalenetetracarboxylic acid dianhydride, 2,3,5,6-pyridinetetracarboxylic acid dianhydride, 1,4,5,8-naphthalenetetracarboxylic acid dianhydride, or a mixture thereof.
Claim 6
Dependent Claim
24 words
A process according to claim 1, wherein the inert solvent is N-methyl-2-pyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, N,N-diethylformamide, dimethylsulfoxide, hexamethylphosphoramide, tetramethylene sulfone, cresol, or a mixture thereof.
Claim 7
Dependent Claim
22 words
A process according to claim 4, wherein aromatic diisocyanate is 3,3'-diphenylether diisocyanate, 3,3'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, or a mixture thereof.
Claim 8
Dependent Claim
71 words
A polyimide-amide-carboxylic acid produced by (a) reacting an aromatic diamine with an aromatic tetracarboxylic acid dianhydride in amounts of 1.5 to 2.0 moles of the dianhydride per mole of the diamine in the presence of an inert solvent, and (b) reacting the resulting intermediate reaction product with an aromatic diisocyanate in about equivalent amounts at a temperature of 50° to 100° C. while removing generated carbon dioxide from the reaction system.
Claim 9
Dependent Claim
71 words
A polyimide-amide-carboxylic acid produced by (a) reacting an aromatic diamine with an aromatic tetracarboxylic acid dianhydride in amounts of 1.5 to 2.0 moles of the dianhydride per mole of the diamine in the presence of an inert solvent, and (b) reacting the resulting intermediate reaction product with an aromatic diisocyanate in about equivalent amounts at a temperature of 50° to 100° C. while removing generated carbon dioxide from the reaction system.
Claim 10
Dependent Claim
29 words
A polyimide-amide-carboxylic acid according to claim 7, wherein the aromatic diamine is 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl sulfide, meta-phenylenediamine, para-phenylenediamine, 1,5-naphthalenediamine, 2,6-naphthalenediamine, 4,4'-diaminodiphenyl ether-3-sulfonamide, 4,4'-diaminodiphenyl ether-3-carbonamide, or a mixture thereof.
Claim 11
Dependent Claim
39 words
A polyimide-amide-carboxylic acid according to claim 8, wherein the aromatic tetracarboxylic acid dianhydride is pyromellitic acid dianhydride, 3,3',4,4'-diphenyltetracarboxylic acid dianhydride, 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride, 1,2,5,6-naphthalenetetracarboxylic acid dianhydride, 2,3,5,6-naphthalenetetracarboxylic acid dianhydride, 2,3,5,6-pyridinetetracarboxylic acid dianhydride, 1,4,5,8-naphthalenetetracarboxylic acid dianhydride, or a mixture thereof.
Claim 12
Dependent Claim
24 words
A polyimide-amide-carboxylic acid according to claim 9, wherein the aromatic diisocyanate is 3,3'-diphenylether diisocyanate, 3,3'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture thereof.
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |