US4459218A
Expired / Lapsed
US
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Composition for liquid crystal color display
Assignee: Mitsui Chemicals Inc
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Filing: 1981-09-30
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Granted: 1984-07-10
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Expires: 2001-09-30
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
2026-11-07 16:14
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09B; C09B3/00; C09B3/14; C09K19/606
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 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: ##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
130 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: ##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
23 words
The composition of claim 1 wherein a mixture of said perylenedicarboxylic acid ester dyes is dissolved in at least one nematic liquid crystal.
Claim 4
Dependent Claim
23 words
The composition of claim 1 wherein a mixture of said perylenedicarboxylic acid ester dyes is dissolved in a mixture of nematic liquid crystals.
Claim 5
Dependent Claim
30 words
The composition of claim 1 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 6
Dependent Claim
24 words
The composition of claim 4 wherein said concentration is 0.01 to 5 percent by weight based on the weight of the nematic liquid crystal.
Claim 7
Dependent Claim
27 words
The composition of claim 1 wherein a mixture of said perylenedicarboxylic acid ester dye and at least one anthraquinoic dye is dissolved in said nematic liquid crystal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |