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US4749777A
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Liquid crystal aligning agent from tetracarboxylic acid dianhydride, diamine and monoamine
Assignee: Nissan Chemical Corp
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Filing: 1987-06-11
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Granted: 1988-06-07
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Expires: 2007-06-11
Abstract
Abstract A liquid crystal aligning agent consisting essentially of a polyimide resin obtained by the polymerization of a diamine, a tetracarboxylic acid dianhydride and a monoamine of the formula: R.sup.2 (R.sup.1).sub.n NH.sub.2 (I) wherein R 1 is a divalent organic group, R 2 is an alkyl group having from 6 to 20 carbon atoms, and n is 0 or 1.
Inventors
- 👤 Noriaki Kohtoh
- 👤 Toyohiko Abe
- 👤 Hiroyoshi Fukuro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/101; C08G73/1014; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/56; C09K2323/00; C09K2323/02; C09K2323/025; C09K2323/027
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A liquid crystal aligning agent consisting essentially of a polyimide resin obtained by the polymerization of a diamine, a tetracarboxylic acid dianhydride and a monoamine of the formula: R.sup.2 (R.sup.1).sub.n NH.sub.2 (I) wherein R 1 is a divalent organic group, R 2 is an alkyl group having from 6 to 20 carbon atoms, and n is 0 or 1.
Claim 2
Dependent Claim
59 words
A liquid crystal aligning agent consisting essentially of a polyimide resin obtained by the polymerization of a diamine, a tetracarboxylic acid dianhydride and a monoamine of the formula: R.sup.2 (R.sup.1).sub.n NH.sub.2 (I) wherein R 1 is a divalent organic group, R 2 is an alkyl group having from 6 to 20 carbon atoms, and n is 0 or 1.
Claim 3
Dependent Claim
50 words
The liquid crystal aligning agent according to claim 1 wherein the polyimide resin is obtained by polymerizing a mol of a diamine, b mol of a tetracarboxylic dianhydride and c mol of a monoamine of the formula I in a relation to satisfy the following formulas: b>a≧b/2 (1) 2(b-a)≧c>0 (2)
Claim 4
Dependent Claim
23 words
The liquid crystal aligning agent according to claim 2, wherein the polymerization is conducted at a temperature of from -20° to 400° C.
Claim 5
Dependent Claim
37 words
The liquid crystal aligning agent according to claim 1, wherein the diamine is an aromatic diamine selected from the group consisting of p-phenylene diamine, m-phenylenediamine, diaminodiphenylmethane, diaminodiphenyl ether, 2,2-diaminodiphenylpropane, diaminodiphenylsulfone, diaminobenzophenone, diaminonaphthalene, 1,3-bis(4-aminophenoxy)benzene, 1,4-bis(4-aminophenoxy)benzene, 4,4'-di(4-aminophenoxy)diphenylsulfone and 2,2-bis[4-(4-aminophenoxy)phenyl]propane.
Claim 6
Dependent Claim
30 words
The liquid crystal aligning agent according to claim 1, wherein the diamine is an alicyclic diamine selected from the group consisting of 1,3-diaminocyclohexane, 1,4-diaminocyclohexane, 4,4'-diaminodicyclohexylmethane, 4,4'-diamino-3,3'-dimethyldicyclohexylmethane, 4,4'-diaminodicyclohexylsulfone and 4,4'-diaminodicyclohexyl ether.
Claim 7
Dependent Claim
27 words
The liquid crystal aligning agent according to claim 1, wherein the diamine is an aliphatic diamine selected from the group consisting of 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane and 1,6-diaminohexane.
Claim 8
Dependent Claim
36 words
The liquid crystal aligning agent according to claim 1, wherein the tetracarboxylic acid dianhydride is an aromatic tetracarboxylic acid dianhydride selected from the group consisting of pyromellitic acid dianhydride, benzophenonetetracarboxylic acid dianhydride and biphenyltetracarboxylic acid dianhydride.
Claim 9
Dependent Claim
36 words
The liquid cyrstal aligning agent according to claim 1, wherein the tetracarboxylic acid dianhydride is an alicyclic tetracarboxylic acid dianhydride selected from the group consisting of cyclobutanetetracarboxylic acid dianhydride, cyclopentanetetracarboxylic acid dianhydride and cyclohexanetetracarboxylic acid dianhydride.
Claim 10
Dependent Claim
19 words
The liquid crystal aligning agent according to claim 1, wherein the tetracarboxylic acid dianhydride is a butanetetracarboxylic acid dianhydride.
Claim 11
Dependent Claim
31 words
The liquid crystal aligning agent according to claim 1, wherein the monoamine is an aliphatic amine selected from the group consisting of n-hexylamine, n-octylamine, n-decylamine, n-dodecylamine, n-hexadecylamine, 1,3-dimethylbutylamine, 1,5-dimethylhexylamine and 2-ethylhexylamine.
Claim 12
Dependent Claim
31 words
The liquid crystal aligning agent according to claim 1, wherein the monoamine is an aromatic amine selected from the group consisting of p-aminophenylhexane, p-aminophenyloctane, p-aminophenyldodecane, p-aminophenyltetradecane, p-aminophenylhexadecane, p-aminophenoxyoctane, p-aminophenoxydodecane and p-aminophenoxyhexadecane.
References Cited (Backward Citations)
US3994567A
Cited
JPS57133432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |