US4555355A
Expired / Lapsed
US
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Composition for liquid crystal color display
Assignee: Mitsui Chemicals Inc
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Filing: 1983-11-22
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Granted: 1985-11-26
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Expires: 2003-11-22
Abstract
Abstract As dichroic dyes for use in a liquid color display device, compounds of formula (I) ##STR1## such as 4'-octylphenyl perylene-3,9-dicarboxylate are provided. These compounds have various characteristic properties. For example, (1) they have a sufficient coloring ability in small amounts; (2) they have a high dichroic ratio and show a high contrast by application and non-application of voltage; (3) they have sufficient compatibility with liquid crystals; (4) they have excellent durability, are stable, and do not reduce the performance of a display device even in long-term use.
Inventors
- 👤 Yasuyuki Yamada
- 👤 Tadaaki Tanaka
- 👤 Ryoichi Tukahara
- 👤 Tsutomu Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:39
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09B; C09B3/00; C09B3/14; C09K19/606
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A composition for liquid crystal color display, said composition comprising at least one nematic liquid crystal and at least one perylenedicarboxylic acid ester dye represented by the following formula (II): ##STR6## wherein R 1 ' and R 1 are identical or different, and each represents a cyclohexyl, bicyclohexyl, cyclohexylphenyl, phenyl or biphenyl group which may be substituted by a halogen atom, an alkyl group having 1 to 15 carbon atoms or alkoxy group having 1 to 15 carbon atoms; or a group of the formula, Alk--X, wherein Alk represents an alkylene group having 1 to 15 carbon atoms which may be branched and X represents a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms, nitrile group, a halogen atom or a hydroxyl group.
Claim 2
Dependent Claim
131 words
A composition for liquid crystal color display, said composition comprising at least one nematic liquid crystal and at least one perylenedicarboxylic acid ester dye represented by the following formula (II): ##STR6## wherein R 1 ' and R 1 are identical or different, and each represents a cyclohexyl, bicyclohexyl, cyclohexylphenyl, phenyl or biphenyl group which may be substituted by a halogen atom, an alkyl group having 1 to 15 carbon atoms or alkoxy group having 1 to 15 carbon atoms; or a group of the formula, Alk--X, wherein Alk represents an alkylene group having 1 to 15 carbon atoms which may be branched and X represents a phenyl group which may be substituted by an alkyl group having 1 to 4 carbon atoms, nitrile group, a halogen atom or a hydroxyl group.
Claim 3
Dependent Claim
46 words
The composition of claim 1 wherein said perylenedicarboxylic acid ester dye is represented by the following formula (IV): ##STR7## wherein R 2 ' and R 2 are identical or different and each represents an alkyl group having 1 to 15 carbon atoms which may be branched.
Claim 4
Dependent Claim
25 words
The composition of claim 1 or 2 wherein a mixture of said perylenedicarboxylic acid ester dyes is dissolved in at least one nematic liquid crystal.
Claim 5
Dependent Claim
25 words
The composition of claim 1 or 2 wherein a mixture of said perylenedicarboxylic acid ester dyes is dissolved in a mixture of nematic liquid crystals.
Claim 6
Dependent Claim
32 words
The composition of claim 1 or 2 wherein the concentration of said perylenedicarboxylic acid ester dye is 0.01 to 10 percent by weight based upon the weight of the nematic liquid crystal.
Claim 7
Dependent Claim
24 words
The composition of claim 5 wherein said concentration is 0.01 to 5 percent by weight based on the weight of the nematic liquid crystal.
Claim 8
Dependent Claim
29 words
The composition of claim 1 or 2 wherein a mixture of said perylenedicarboxylic acid ester dye and at least one anthraquinoic dye is dissolved in said nematic liquid crystal.
References Cited (Backward Citations)
JPS5448572A
Cited
JPS5448571A
Cited
US4211473A
Cited
DE2851513A1
Cited
EP0047027A1
Cited
US4459218A
Cited
US4378302A
Cited
EP0068427A1
Cited
US4454057A
Cited
EP0098522A2
Cited
DE3231707A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |