US4954612A
Expired / Lapsed
US
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Solvent-soluble polyimide and production thereof
Assignee: Resonac Corp
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Filing: 1989-02-14
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Granted: 1990-09-04
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Expires: 2009-02-14
Abstract
Abstract A solvent-soluble polyimide obtained from an exo-form dicarboxylic acid anhydride with an aromatic diamine, e.g. 2,2,-bis[4-(4-aminophenoxy)phenyl]propane is improved in film-forming properties and transparency, and particularly suitable for producing an orientation controlling film in a liquid crystal display device.
Inventors
- 👤 Yoshihiro Nomura
- 👤 Kazuhito Hanabusa
- 👤 Hiroshi Minamisawa
- 👤 Takashi Morinaga
- 👤 Toichi Sakata
- 👤 Yoshiyuki Mukoyama
- 👤 Hiroshi Nishizawa
- 👤 Hiromu Miyajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:45
CPC Classifications
C; C07; C07K; C07K5/00; C07K5/02; C07K5/0202; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1057; C08G73/1064
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
37 words
A solvent-soluble polyimide obtained by reacting an exo-form dicarboxylic acid anhydride represented by the formula: ##STR16## wherein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 2
Dependent Claim
37 words
A solvent-soluble polyimide obtained by reacting an exo-form dicarboxylic acid anhydride represented by the formula: ##STR16## wherein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 3
Dependent Claim
242 words
A polyimide according to claim 1, wherein the aromatic diamine is at least one member selected from the group consisting of: a compound of the formula: ##STR17## wherein R 1 is a hydrogen atom, a lower alkyl group, a lower alkoxy group, a chlorine atom or a bromine atom, a compound of the formula: ##STR18## wherein R 2 and R 3 are independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a chlorine atom or a bromine atom, a compound of the formula: ##STR19## wherein R 4 , R 5 , R 6 and R 7 are independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a chlorine atom or a bromine atom, a compound of the formula: ##STR20## wherein Z is an alkylene group having 1 to 6 carbon atoms, ##STR21## R 8 , R 9 , R 10 and R 11 are independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a chlorine atom or a bromine atom; and R 12 and R13 are independently a lower alkyl group, a compound of the formula: ##STR22## wherein Z' is an alkylene group having 1 to 6 carbon atoms, ##STR23## R 14 , R 15 , R 16 and R 17 are independently a hydrogen atom, a lower alkyl group, a lower alkoxy group, a chlorine atom or a bromine atom; and R 18 and R 19 are independently a lower alkyl group.
Claim 4
Dependent Claim
53 words
A solvent-soluble polyimide having repeating units represented by the formula: ##STR24## wherein X is S or SO 2 ; and n is a positive integer, and a reduced viscosity of 0.3 dl/g or more when measured at 30° C. using 100 ml of a solution of dimethylformamide dissolving 0.5 g of the polyimide.
Claim 5
Dependent Claim
53 words
A solvent-soluble polyimide having repeating units represented by the formula: ##STR24## wherein X is S or SO 2 ; and n is a positive integer, and a reduced viscosity of 0.3 dl/g or more when measured at 30° C. using 100 ml of a solution of dimethylformamide dissolving 0.5 g of the polyimide.
Claim 6
Dependent Claim
41 words
A process for producing a solvent-soluble polyimide which comprises reacting an exo-form carboxylic acid anhydride represented by the formula: ##STR25## herein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 7
Dependent Claim
41 words
A process for producing a solvent-soluble polyimide which comprises reacting an exo-form carboxylic acid anhydride represented by the formula: ##STR25## herein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 8
Dependent Claim
45 words
A process according to claim 4, wherein the reaction is continued so as to make the polyimide have a reduced viscosity of 0.3 dl/g or more when measured at 30° C. using 100 ml of a solution of dimethylformamide dissolving 0.5 g of the polyimide.
Claim 9
Dependent Claim
42 words
A process according to claim 4, wherein the exo-form carboxylic acid anhydride is used in an amount of 40 to 80% by mole together with 60 to 20% by mole of benzophenonetetracarboxylic acid anhydride, a total acid component being 100% by mole.
Claim 10
Dependent Claim
12 words
A process according to claim 4, wherein the aromatic diamine is 2,2-bis[4-(4-aminophenoxy)phenyl]propane.
Claim 11
Dependent Claim
21 words
A process for using the solvent-soluble polyimide of claim 1 as an orientation controlling film in a liquid crystal display device.
Claim 12
Dependent Claim
21 words
A process for using the solvent-soluble polyimide of claim 3 as an orientation controlling film in a liquid crystal display device.
Claim 13
Dependent Claim
53 words
In a liquid crystal display device, the improvement wherein an orientation controlling film is made from a solvent-soluble polyimide obtained by reacting an exo-form dicarboxylic acid anhydride represented by the formula: ##STR26## wherein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 14
Dependent Claim
53 words
In a liquid crystal display device, the improvement wherein an orientation controlling film is made from a solvent-soluble polyimide obtained by reacting an exo-form dicarboxylic acid anhydride represented by the formula: ##STR26## wherein X is S or SO 2 , with an aromatic diamine in a polar solvent, followed by dehydration ring closure.
Claim 15
Dependent Claim
63 words
A polyimide according to claim 2, wherein the aromatic diamine is a mixture of at least one diamine selected from compounds of the formula (II) to (VI) and a diaminosiloxane of the formula: ##STR27## wherein R 20 is a divalent hydrocarbon; R 21 and R 22 are independently an alkyl group, a phenyl group or a phenyl group substituted with an alkyl group.
Claim 16
Dependent Claim
21 words
A process for using the solvent-soluble polyimide of claim 11 as an orientation controlling film in a liquid crystal display device.
Claim 17
Dependent Claim
29 words
A polyimide according to claim 11, wherein the diaminosiloxane is in an amount of 0.5% by mol to 50% by mol based on the total amount of the diamine.
References Cited (Backward Citations)
US4588804A
Cited
US4696994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |