US4082428A
Expired / Lapsed
US
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Liquid crystal composition and method
Assignee: Suncrux Inc
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Filing: 1976-08-02
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Granted: 1978-04-04
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Expires: 1996-08-02
Abstract
Abstract An optically active chiral nematic compound of the general formula: ##STR1## wherein n varies from 1-5, and R 1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group. Where R 1 contains an alkyl group, it includes from 1 to 8 carbon atoms. The above compound comprises an amount of 0.2 to 2 weight percent in a mixed ester liquid crystal composition with a nematic temperature range of at least 0° to 50° C, said chiral and mixed ester compositions being miscible in each other. A nematic mixed ester liquid crystal composition comprising (a) a mixture of specific alkylphenyl benzoates and (b) a mixture of cyanophenyl benzoates. All of the foregoing compositions being useful as liquid crystals for electro-optical display devices and the like.
Inventors
- 👤 Ying-Yen Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:15
CPC Classifications
C; C07; C07C; C07C255/00; C07C37/00; C07C37/01; C07C37/045; C07C45/00; C07C45/45; C07C45/46; C07C49/00; C07C49/76; C07C51/00; C07C51/16; C07C51/29; C07C51/58; C07C51/60; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
82 words
In an electro-optical device including a field effect ester liquid crystal layer comprising p'-substituted-p-alkyl-and p-cyanophenylbenzoates, the improvement comprising from 0.2 to 2% of an optically active of chiral nematic compound in said liquid crystal layen, said optically active chiral nematic compound having the formula: ##STR36## wherein n varies from 1-5, and R 1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group.
Claim 2
Dependent Claim
82 words
In an electro-optical device including a field effect ester liquid crystal layer comprising p'-substituted-p-alkyl-and p-cyanophenylbenzoates, the improvement comprising from 0.2 to 2% of an optically active of chiral nematic compound in said liquid crystal layen, said optically active chiral nematic compound having the formula: ##STR36## wherein n varies from 1-5, and R 1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group.
Claim 3
Dependent Claim
21 words
The electro-optical device of claim 1 in which R 1 is a normal saturated alkyl group including from 1-8 carbon atoms.
Claim 4
Dependent Claim
21 words
The electro-optical device of claim 1 in which R 1 is selected from the group consisting of cyano and nitro groups.
Claim 5
Dependent Claim
97 words
A nematic field-effect liquid crystal composition comprising a solution of: (a) at least one compound of the general formula: ##STR37## wherein n varies from 1-5, and R 1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group, and (b) a mixture of field effect esters miscible with compound (a) and having a nematic temperature range of at least 0° to 50° C and a positive dielectric anisotropy, said mixture of field-effect esters comprising a mixture of p'-substituted-p-alkyl-andp-cyanophenylbenzoates.
Claim 6
Dependent Claim
97 words
A nematic field-effect liquid crystal composition comprising a solution of: (a) at least one compound of the general formula: ##STR37## wherein n varies from 1-5, and R 1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group, and (b) a mixture of field effect esters miscible with compound (a) and having a nematic temperature range of at least 0° to 50° C and a positive dielectric anisotropy, said mixture of field-effect esters comprising a mixture of p'-substituted-p-alkyl-andp-cyanophenylbenzoates.
Claim 7
Dependent Claim
16 words
The composition of claim 4 in which mixture (b) comprise a plurality of different p'-substituted-p-cyanophenylbenzoate esters.
Claim 8
Dependent Claim
19 words
The composition of claim 4 in which mixture (b) comprises a plurality of p'-substituted-p-n-alkylphenylbenzoates and a plurality of p'-substituted-p-cyanophenylbenzoates.
Claim 9
Dependent Claim
24 words
The composition of claim 6 in which the compound of part (a) comprises from about 0.2 to 2 weight percent of the total composition.
Claim 10
Dependent Claim
21 words
The composition of claim 4 disposed in a liquid crystal layer between spaced facing transparent electrical conductors of an electro-optic device.
Claim 11
Dependent Claim
33 words
The composition of claim 8 in which the compound of part (a) is present in a concentration which imparts an approximately 90° twist to mixture (b) in the distance between said electrical conductors.
Claim 12
Dependent Claim
20 words
The composition of claim 4 in which R 1 is selected from the group consisting of cyano and nitro groups.
Claim 13
Dependent Claim
57 words
The composition of claim 4 having a nematic temperature range of 0° C to 50° C in which said ester mixture (b) comprises: a mixture of p'-substituted-p-n-alkylphenylbenzoates comprising: ##STR38## a strongly positive anisotropic mixture of p'-substituted-p-cyanophenylbenzoates of the formula: ##STR39## wherein R 2 is selected from the group of n-alkyl radicals, n-alkoxy radicals, and n-alkyl carbonato radicals.
Claim 14
Dependent Claim
17 words
The composition of claim 11 in which the p'-substituted-p-alkylphenyl-benzoate mixture comprises the major portion of the composition.
Claim 15
Dependent Claim
18 words
The composition of claim 11 in which the p'-substituted-p-alkylphenyl-benzoate mixture of also includes a minor amount of ##STR40##
Claim 16
Dependent Claim
17 words
The composition of claim 11 in which the p'-substituted-p-alkylphenyl-benzoate mixture also includes a minor amount of ##STR41##
Claim 17
Dependent Claim
26 words
The composition of claim 11 in which the mixture includes at least two compounds of said p'-substituted-p-cyanophenylbenzoate formula in which R 2 is an n-alkyl group.
Claim 18
Dependent Claim
46 words
The composition of claim 11 in which the strongly positive anisotropic mixture of part (b) includes three compounds of said p'-substituted-p-cyanophenylbenzoate formula in which R 2 is an n-alkyl group, and one compound of said p'-substituted-p-cyanophenylbenzoate formula in which R 2 is an n-alkyl carbonato group.
Claim 19
Dependent Claim
31 words
The liquid crystal composition of claim 11 in which said p'-substituted-p-alkylphenylbenzoate mixture comprises: ______________________________________
Weight
Compound %
______________________________________
##STR42## 40 ± 15
##STR43## 26 ± 10
##STR44## 15 ± 7.
______________________________________
Claim 20
Dependent Claim
35 words
The liquid crystal composition of claim 11 in which the p'-substituted-p-alkylphenylbenzoate mixture comprises: ______________________________________
Weight
Compound %
______________________________________
##STR45## 38 ± 8
##STR46## 25 ± 10
##STR47## 15 ± 5
##STR48## 24 ± 5.
______________________________________
Claim 21
Dependent Claim
35 words
The liquid crystal composition of claim 11 in which the p'-substituted-p-alkylphenylbenzoate mixture comprises: ______________________________________
Weight
Compound %
______________________________________
##STR49## 50 ± 15
##STR50## 25 ± 10
##STR51## 15 ± 10
##STR52## 15 ± 7.
______________________________________
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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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |