US4360447A
Expired / Lapsed
US
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Composition for liquid crystal color display elements
Assignee: Mitsui Chemicals Inc
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Filing: 1980-03-11
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Granted: 1982-11-23
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Expires: 2000-03-11
Abstract
Abstract A composition for nematic liquid crystal color display elements, said composition comprising at least one anthraquinonic dye represented by the following formula <IMAGE> (I) wherein X and Y are identical or different and represent -NH2 or -OH; Z represents halogen, -OR, -NHR, <IMAGE> -CONHR2 or -COOR2, in which R represents an alkyl group having 1 to 15 carbon atoms or a lower alkyl group optionally substituted by -OH, <IMAGE> represents hydrogen, halogen, -OH, -OCH3, an alkyl group having 1 to 15 carbon atoms, or a methoxy group optionally substituted by <IMAGE> and R2 is a phenyl group, an alkyl group having 2 to 5 carbon atoms or a cyclohexyl group; and n is an integer of 1 or 2 provided that when X is -NH2 and Y is -OH, and when X and Y are both -OH, n is an integer of 1, and when n represents an integer of 2, the two Z's may be identical or different dissolved in at least one nematic liquid crystal.
Inventors
- 👤 Ryoichi Morinaka
- 👤 Ryoichi Tukahara
- 👤 Tsutomu Nishizawa
- 👤 Tuneo Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/603; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/50; C09B1/503; C09B1/54; C09B1/542
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
209 words
A composition for nematic liquid crystal color display elements, said composition comprising at least one nematic liquid crystal and at least one anthraquinonic dye represented by the following formula ##STR48## wherein X and Y are identical or different and represent --NH 2 or --OH; Z is bonded to the 2-position and/or 3-position relative to X and represents --OR, --NHR, ##STR49## --CONHR 2 or --COOR 2 , in which R represents an alkyl group having 4 to 15 carbon atoms or a lower alkyl group substituted by --OH, ##STR50## R 1 represents hydrogen, halogen, --OH, --OCH 3 , an alkyl group having 1 to 15 carbon atoms, or a methoxy group optionally substituted by ##STR51## and R 2 is a phenyl group, an alkyl group having 2 to 5 carbon atoms or a cyclohexyl group; and n is an integer of 1 or 2 provided that when X is --NH 2 and Y is --OH, and when X and Y are both --OH, n is an integer of 1, and when n represents an integer of 2, the two Z's may be identical or different, or one may be the group defined above and the other may be a halogen, said anthraquinonic dye being dissolved in the nematic liquid crystal.
Claim 2
Dependent Claim
209 words
A composition for nematic liquid crystal color display elements, said composition comprising at least one nematic liquid crystal and at least one anthraquinonic dye represented by the following formula ##STR48## wherein X and Y are identical or different and represent --NH 2 or --OH; Z is bonded to the 2-position and/or 3-position relative to X and represents --OR, --NHR, ##STR49## --CONHR 2 or --COOR 2 , in which R represents an alkyl group having 4 to 15 carbon atoms or a lower alkyl group substituted by --OH, ##STR50## R 1 represents hydrogen, halogen, --OH, --OCH 3 , an alkyl group having 1 to 15 carbon atoms, or a methoxy group optionally substituted by ##STR51## and R 2 is a phenyl group, an alkyl group having 2 to 5 carbon atoms or a cyclohexyl group; and n is an integer of 1 or 2 provided that when X is --NH 2 and Y is --OH, and when X and Y are both --OH, n is an integer of 1, and when n represents an integer of 2, the two Z's may be identical or different, or one may be the group defined above and the other may be a halogen, said anthraquinonic dye being dissolved in the nematic liquid crystal.
Claim 3
Dependent Claim
32 words
The composition of claim 1 wherein said anthraquinonic dye is represented by the following formula ##STR52## wherein R 3 represents a linear or branched alkyl group having 4 to 15 carbon atoms.
Claim 4
Dependent Claim
23 words
The composition of claim 1 or 2 wherein a mixture of said anthraquinonic dyes is dissolved in at least one nematic liquid crystal.
Claim 5
Dependent Claim
23 words
The composition of claim 1 or 2 wherein a mixture of said anthraquinonic dyes is dissolved in a mixture of nematic liquid crystals.
Claim 6
Dependent Claim
30 words
The composition of claim 1 or 2 wherein the concentration of said anthraquinonic dye is 0.01 to 20 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 3 percent by weight based on the weight of the nematic liquid crystal.
Claim 8
Dependent Claim
17 words
The composition of claim 1 or 2 wherein said nematic liquid crystal has a positive dielectric anisotropy.
Claim 9
Dependent Claim
17 words
The composition of claim 1 or 2 wherein said nematic liquid crystal has a negative dielectric anisotropy.
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |