Patent EP0142149A2 successfully refreshed from Google Patents.
EP0142149A2
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EP
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Use of fluorine containing polyimides for aligning layers of liquid crystal display devices.
Assignee: Hitachi Ltd
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Filing: 1984-11-12
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Granted: —
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Expires: 2004-11-12
Abstract
Abstract A polyimide obtained from a polyamide-acid having perfluoroalkylene moieties in its recurring structural units is excellent in moisture resistance and heat resistance.
Inventors
- 👤 Shunichi Numata
- 👤 Koji Fujisaki
- 👤 Noriyuki Kinjo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:13
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064; C08G73/1046
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
88 words
A polyamide-acid derivative having repeating units of the formula: wherein Y 1 and Y 2 are independently a divalent group of -O-, or R f is a perfluoroalkylene group; each X is independently an alkyl group, a fluorinated alkyl group or a halogen atom; R is a hydrogen atom or an alkyl group; R is a diamine residue obtained by removing two amino groups from a diamine; m is zero or an integer of 1 to 3; and n is zero or an integer of 1 to 4.
Claim 2
Dependent Claim
88 words
A polyamide-acid derivative having repeating units of the formula: wherein Y 1 and Y 2 are independently a divalent group of -O-, or R f is a perfluoroalkylene group; each X is independently an alkyl group, a fluorinated alkyl group or a halogen atom; R is a hydrogen atom or an alkyl group; R is a diamine residue obtained by removing two amino groups from a diamine; m is zero or an integer of 1 to 3; and n is zero or an integer of 1 to 4.
Claim 3
Dependent Claim
21 words
A polyamide-acid derivative according to Claim 1, which further includes pyrrolone rings or isoindoloquinazolinedione rings or pyrrolone rings and isoindoloquinazolinedione rings.
Claim 4
Dependent Claim
19 words
A polyamide-acid derivative according to Claim 1, which is produced by reacting a diamine with a tetracarboxylic acid derivative.
Claim 5
Dependent Claim
19 words
A polyamide-acid derivative according to Claim 1, wherein Y 1 and Y 2 in the formula (I) are independently
Claim 6
Dependent Claim
19 words
A polyamide-acid derivative according to Claim 1, wherein Y 1 and Y 2 in the formula (I) are -O-.
Claim 7
Dependent Claim
78 words
A polyimide having repeating units of the formula: wherein Y 1 and Y 2 are independently a divalent group of -O-, or R f is a perfluoroalkylene group; each X is independently an alkyl group, a fluorinated alkyl group or a halogen atom; R is a diamine residue obtained by removing two amino groups from a diamine; m is zero or an integer of 1 to 3; and n is zero or an integer of 1 to 4.
Claim 8
Dependent Claim
78 words
A polyimide having repeating units of the formula: wherein Y 1 and Y 2 are independently a divalent group of -O-, or R f is a perfluoroalkylene group; each X is independently an alkyl group, a fluorinated alkyl group or a halogen atom; R is a diamine residue obtained by removing two amino groups from a diamine; m is zero or an integer of 1 to 3; and n is zero or an integer of 1 to 4.
Claim 9
Dependent Claim
19 words
A polyimide according to Claim 6, wherein Y 1 and Y 2 in the formula (II) are independently or
Claim 10
Dependent Claim
19 words
A polyimide according to Claim 6, wherein Y 1 5 and Y 2 in the formula (II) are -0-.
Claim 11
Dependent Claim
9 words
A polyimide obtained from the polyamide-acid of Claim 2.
Claim 12
Dependent Claim
9 words
A polyimide obtained from the polyamide-acid of Claim 3.
Claim 13
Dependent Claim
25 words
A polyamide-acid according to Claim 1, wherein the R f in the formula (I) is and at least one X is C F 3 .
Claim 14
Dependent Claim
28 words
A polyamide-acid according to Claim 3, wherein the diamine is 2,2-bisI4-(4-aminophenoxy)phenyl]hexafluoropropane, 2,2-bis[4-(3-trifluoromethyl-4-amino- phenoxy)phenyl]hexafluoropropane or a mixture of at least one of the above-mentioned diamines and another aromatic diamine.
Claim 15
Dependent Claim
35 words
A polyamide-acid according to Claim 3, wherein the tetracarboxylic acid derivative is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]hexafluoropropane dianhydride, 2,2-bis[4-(3,4-dicarboxybenzoyloxy)phenyl]hexafluoropropane dianhydride, or a mixture of at least one of the above-mentioned tetracarboxylic acid derivatives and another aromatic tetracarboxylic acid derivative.
Claim 16
Dependent Claim
9 words
A polyimide obtained from the polyamide-acid of Claim 11.
Claim 17
Dependent Claim
9 words
A polyimide obtained from the polyamide-acid of Claim 12.
Claim 18
Dependent Claim
9 words
A polyimide obtained from the polyamide-acid of Claim 13.
References Cited (Backward Citations)
No citation records indexed.
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