Patent US4493389A successfully refreshed from Google Patents.
US4996293A
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Composition comprising polyimide resin from diphenyl sulfone -3,3',4,4'-tetracarboxylic acid dianhydride
Assignee: New Japan Chemical Co Ltd
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Filing: 1988-02-12
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Granted: 1991-02-26
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Expires: 2008-02-12
Abstract
Abstract This invention provides: A. A polyimide resin composition which comprises at least one polyimide having a repeating unit of the general formula ##STR1## wherein Z is --S--, ##STR2## in which X is --O--, --S-- or ##STR3## Y is a single chemical bond or a bivalent group selected from the group consisting of --O--, --S--, --SO 2 --, ##STR4## and --CO--, and R 1 and R 2 are the same or different and each independently is a hydrogen atom, a halogen atom or a lower alkyl group which may optionally be substituted by a halogen atom or atoms, and having an inherent viscosity (η inh ) of about 0.3- about 5.0 dl/g, the polyimide being dissolved in an organic solvent, and a method of producing such composition and B. A polyimide resin composition which is otherwise the same as the above composition but further contains a silane coupling agent added thereto, and a method of producing such composition.
Inventors
- 👤 Ikeda Tsuyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064; C08G73/106; C08K; C08K5/00; C08K5/54
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
A polyimide resin composition which comprises at least one polyimide having a repeating unit of the general formula ##STR9## wherein Z is --S--, ##STR10## in which X is --O--, --S--, or ##STR11## Y is a single chemical bond or Y represents a bivalent group selected from the group consisting of --O--, --S--, --SO 2 --, ##STR12## and --CO--, and R 1 and R 2 are the same or different and each independently is a hydrogen atom, a halogen atom or a lower alkyl group optionally substituted by a halogen atom or atoms, and having an inherent viscosity (η inh ) measured in an N-methyl-2-pyrrolidone solvent at a concentration of 0.5 g/100 ml and at a temperature of 30±1° C. of about 0.3- about 5.0 dl/g, said polyimide being dissolved in an organic solvent.
Claim 2
Dependent Claim
133 words
A polyimide resin composition which comprises at least one polyimide having a repeating unit of the general formula ##STR9## wherein Z is --S--, ##STR10## in which X is --O--, --S--, or ##STR11## Y is a single chemical bond or Y represents a bivalent group selected from the group consisting of --O--, --S--, --SO 2 --, ##STR12## and --CO--, and R 1 and R 2 are the same or different and each independently is a hydrogen atom, a halogen atom or a lower alkyl group optionally substituted by a halogen atom or atoms, and having an inherent viscosity (η inh ) measured in an N-methyl-2-pyrrolidone solvent at a concentration of 0.5 g/100 ml and at a temperature of 30±1° C. of about 0.3- about 5.0 dl/g, said polyimide being dissolved in an organic solvent.
Claim 3
Dependent Claim
27 words
A composition as claimed in claim 1, wherein the organic solvent is at least one member selected from among aprotic polar organic solvents and phenolic organic solvents.
Claim 4
Dependent Claim
18 words
A composition as claimed in claim 1, wherein the polyimide concentration is about 1- about 50% by weight.
Claim 5
Dependent Claim
20 words
A polyimide resin composition which comprises a composition as claimed in claim 1 and a silane coupling agent added thereto.
Claim 6
Dependent Claim
27 words
A composition as claimed in claim 4, wherein the organic solvent is at least one member selected from among aprotic polar organic solvents and phenolic organic solvents.
Claim 7
Dependent Claim
18 words
A composition as claimed in claim 4, wherein the polyimide concentration is about 1- about 50% by weight.
Claim 8
Dependent Claim
28 words
A composition as claimed in claim 4, wherein the silane coupling agent is added in an amount of about 0.1- about 20% by weight based on the polyimide.
Claim 9
Independent Claim
112 words
A method of producing a polyimide resin composition which comprises reacting diphenyl sulfone-3,3',4,4'-tetracarboxylic dianhydride with an aromatic diamine of the general formula ##STR13## wherein Z is --S--, ##STR14## in which X is --O--, --S--, or ##STR15## Y is a single chemical bond or Y represents a bivalent group selected from the group consisting of --O--, --S--, --SO 2 --, ##STR16## and --CO--, and R 1 and R 2 are the same or different and each independently is a hydrogen atom, a halogen atom or a lower alkyl group substituted by a halogen atom or atoms, in the presence of an organic solvent, under conditions sufficient to convert such to of a polyimide.
Claim 10
Independent Claim
112 words
A method of producing a polyimide resin composition which comprises reacting diphenyl sulfone-3,3',4,4'-tetracarboxylic dianhydride with an aromatic diamine of the general formula ##STR13## wherein Z is --S--, ##STR14## in which X is --O--, --S--, or ##STR15## Y is a single chemical bond or Y represents a bivalent group selected from the group consisting of --O--, --S--, --SO 2 --, ##STR16## and --CO--, and R 1 and R 2 are the same or different and each independently is a hydrogen atom, a halogen atom or a lower alkyl group substituted by a halogen atom or atoms, in the presence of an organic solvent, under conditions sufficient to convert such to of a polyimide.
Claim 11
Dependent Claim
32 words
A method of production as claimed in claim 8, wherein the organic solvent is at least one member selected from the group consisting of aprotic polar organic solvents and phenolic organic solvents.
Claim 12
Dependent Claim
31 words
A method of production as claimed in claim 8, wherein the mole ratio between diphenyl sulfone-3,3',4,4'-tetracarboxylic dianhydride and the aromatic diamine of the general formula (II) is about 0.7- about 1.3.
Claim 13
Dependent Claim
28 words
A method of producing a polyimide resin composition as claimed in claim 8 which further comprises, adding a silane coupling agent after completion of the polyimide formation reaction.
Claim 14
Dependent Claim
32 words
A method of production as claimed in claim 11, wherein the organic solvent is at least one member selected from the group consisting of aprotic polar organic solvents and phenolic organic solvents.
Claim 15
Dependent Claim
30 words
A method of production as claimed in claim 11, wherein the mole ratio between diphenyl sulfone-3,3',4,4'-tetracarboxylic dianhydride and the aromatic diamine of general formula (II) is about 0.7- about 1.3.
Claim 16
Dependent Claim
30 words
A method of production as claimed in claim 11, wherein the silane coupling agent is added in an amount of about 0.1- about 20% by weight based on the polyimide.
Claim 17
Dependent Claim
24 words
The method as claimed in claim 8 including separating said produced polyimide from said reaction solvent, and dissolving such polyimide in an organic solvent.
References Cited (Backward Citations)
US4720539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |