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US4495083A
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US
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Guest-host type liquid crystal composition and liquid crystal display device using the same
Assignee: Mitsubishi Chemical Corp
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Filing: 1980-10-10
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Granted: 1985-01-22
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Expires: 2000-10-10
Abstract
Abstract This invention relates to a guest-host type liquid crystal composition and a color liquid crystal display device in which said composition has been sealed. This invention provides a liquid crystal composition containing a specific anthraquinone dye as a pleochroic dye which, as the guest dye, has a degree of orderness of the alignment (order parameter) in the host liquid crystal in the range from 0.5 to 1, shows remarkable contrast between the colored state and the uncolored state, and is excellent in stability to light, heat, and the like. Further, this invention provides a color guest-host type liquid crystal display device in which said liquid crystal composition has been sealed.
Inventors
- 👤 Shuji Imazeki
- 👤 Akio Mukoh
- 👤 Hirosada Morishita
- 👤 Seiichi Imahori
- 👤 Masaharu Kaneko
- 👤 Hitoshi Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:41
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/603; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/22; C09B1/50; C09B1/503; C09B1/54; C09B1/542; C09B1/56; C09B1/58
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
150 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR206## wherein R is OH or NH 2 , provided that (a) when R is OH, Y is selected from the group consisting of COXR' in which X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, and (b) when R is NH 2 , Y is COXR' in which X and R' are as defined above, and wherein said substituents have 1 to 18 carbon atoms when R is OH, and 1 to 24 carbon atoms when R is NH 2 .
Claim 2
Dependent Claim
150 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR206## wherein R is OH or NH 2 , provided that (a) when R is OH, Y is selected from the group consisting of COXR' in which X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, and (b) when R is NH 2 , Y is COXR' in which X and R' are as defined above, and wherein said substituents have 1 to 18 carbon atoms when R is OH, and 1 to 24 carbon atoms when R is NH 2 .
Claim 3
Dependent Claim
31 words
A liquid crystal composition according to claim 1, wherein the liquid crystal contains an optically active substance to convert the nematic state of the nematic liquid crystal into a cholesteric state.
Claim 4
Dependent Claim
18 words
A liquid crystal composition according to claim 2, wherein the optically active substance is a chiral nematic compound.
Claim 5
Dependent Claim
89 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR207## wherein X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, each of said substituents having 1 to 18 carbon atoms.
Claim 6
Dependent Claim
89 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR207## wherein X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, each of said substituents having 1 to 18 carbon atoms.
Claim 7
Dependent Claim
31 words
A liquid crystal composition according to claim 4, wherein the liquid crystal contains an optically active substance to convert the nematic state of the nematic liquid crystal to a cholesteric state.
Claim 8
Dependent Claim
89 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR208## wherein X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, each of said substituents having 1 to 24 carbon atoms.
Claim 9
Dependent Claim
89 words
In a liquid crystal composition comprising at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR208## wherein X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, each of said substituents having 1 to 24 carbon atoms.
Claim 10
Dependent Claim
31 words
A liquid crystal composition according to claim 6, wherein the liquid crystal contains an optically active substance to convert the nematic state of the nematic liquid crystal into a cholesteric state.
Claim 11
Dependent Claim
220 words
A liquid crystal display device comprising a pair of base plates at least one of which is transparent, transparent electrodes for driving the liquid crystal formed on the opposite surface of said base plates facing each other, a liquid crystal layer held between said plates via the transparent electrodes, and a means for applying an electric field for driving the liquid crystal via the aforesaid transparent electrodes, characterized in that the aforesaid liquid crystal layer comprises at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR209## wherein R is OH or NH 2 , provided that (a) when R is OH, Y is selected from the group consisting of COXR' in which X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, and (b) when R is NH 2 , Y is COXR' in which X and R' are as defined above, and wherein said substituents have 1 to 18 carbon atoms when R is OH, and 1 to 24 carbon atoms when R is NH 2 .
Claim 12
Dependent Claim
220 words
A liquid crystal display device comprising a pair of base plates at least one of which is transparent, transparent electrodes for driving the liquid crystal formed on the opposite surface of said base plates facing each other, a liquid crystal layer held between said plates via the transparent electrodes, and a means for applying an electric field for driving the liquid crystal via the aforesaid transparent electrodes, characterized in that the aforesaid liquid crystal layer comprises at least one host liquid crystal and at least one pleochroic dye dissolved as a guest in said at least one host liquid crystal, said host liquid crystal being a nematic liquid crystal, wherein said at least one pleochroic dye includes at least one anthraquinone dye represented by the formula: ##STR209## wherein R is OH or NH 2 , provided that (a) when R is OH, Y is selected from the group consisting of COXR' in which X is an oxygen atom, and R' is a cycloalkyl group or an aryl group each having one or more substituents, and (b) when R is NH 2 , Y is COXR' in which X and R' are as defined above, and wherein said substituents have 1 to 18 carbon atoms when R is OH, and 1 to 24 carbon atoms when R is NH 2 .
Claim 13
Dependent Claim
32 words
A liquid crystal display device according to claim 8, wherein the liquid crystal contains an optically active substance to convert the nematic state of the nematic liquid crystal into a cholesteric state.
Claim 14
Dependent Claim
17 words
A liquid crystal composition according to claim 6, wherein COXR' is ##STR210## wherein R" is said substituent.
Claim 15
Dependent Claim
17 words
A liquid crystal composition according to claim 6, wherein COXR' is ##STR211## wherein R" is said substituent.
Claim 16
Dependent Claim
36 words
A liquid crystal composition according to claim 1, wherein R' is a cyclohexyl group having a substituent, said substituent being selected from the group consisting of an alkyl group, a cyclohexyl group, and an alkylcyclohexyl group.
Claim 17
Dependent Claim
82 words
A liquid crystal composition according to claim 1, wherein R' is an aryl group having a substituent, and wherein said substituent is a phenyl group, an alkylphenyl group, an alkoxyphenyl group, an alkyl group, an alkoxy group, a cycloalkyl group, an alkylcyclohexyl group, an acyloxy group, an acylamino group, a sulfonyloxy group, a sulfonamide group, a group of a carboxylic acid ester, a carbamoyl group, a group of a sulfonic acid ester, a sulfamoyl group, a dialkylamino group, or a cyano group.
Claim 18
Dependent Claim
22 words
A liquid crystal composition according to claim 13, wherein said aryl group having a substituent is a phenyl group having a substituent.
Claim 19
Dependent Claim
43 words
A liquid crystal composition according to claim 1, wherein said at least one pleochroic dye is contained in said at least one host liquid crystal in an amount of at least 0.1% by weight based on the weight of said host liquid crystal.
Claim 20
Dependent Claim
17 words
A liquid crystal composition according to claim 1, wherein said at least one anthraquinone dye comprises: ##STR212##
Claim 21
Dependent Claim
18 words
A liquid crystal display device according to claim 8, wherein said at least one anthraquinone dye comprises: ##STR213##
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |