US4886623A
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Ferroelectric smectic liquid crystal compound and composition containing the same
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1987-12-23
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Granted: 1989-12-12
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Expires: 2007-12-23
Abstract
Abstract A liquid crystal compound represented by formula: ##STR1## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; R 2 represents a straight chain alkyl group having from 2 to 6 carbon atoms or a branched alkyl group having from 3 to 6 atoms and having a methyl group as a side chain; and m and n each represents 1 or 2, is disclosed. The liquid crystal compound of formula (I) is optically and electrically stable and exhibits fast electro-optical switching in image display.
Inventors
- 👤 Shigeru Mitsuhashi
- 👤 Hitoshi Kondo
- 👤 Tetsuharu Okazaki
- 👤 Shinji Endoh
- 👤 Hiroko Kudo
- 👤 Akio Yamaguchi
- 👤 Haruki Tsuruta
- 👤 Susumu Akutagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:45
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/2021
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A liquid crystal compound represented by formula (I): ##STR32## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; R 2 represents a straight chain alkyl group having from 2 to 6 carbon atoms or branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain; m and n each represents 1 or 2, provided that m plus n is 3; and wherein said liquid crystal compound exhibits a spontaneous polarization value of 200 nC/cm 2 or higher in its chiral smectic phase.
Claim 2
Dependent Claim
97 words
A liquid crystal compound represented by formula (I): ##STR32## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; R 2 represents a straight chain alkyl group having from 2 to 6 carbon atoms or branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain; m and n each represents 1 or 2, provided that m plus n is 3; and wherein said liquid crystal compound exhibits a spontaneous polarization value of 200 nC/cm 2 or higher in its chiral smectic phase.
Claim 3
Dependent Claim
49 words
A liquid crystal compound as claimed in claim 1, wherein said compound is represented by formula: ##STR33## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; and R 2' represents a straight chain alkyl group having from 2 to 6 carbon atoms.
Claim 4
Dependent Claim
57 words
A liquid crystal compound as claimed in claim 1, wherein said compound is represented by formula: ##STR34## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; and R 2" represents a branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain.
Claim 5
Dependent Claim
49 words
A liquid crystal compound as claimed in claim 1, wherein said compound is represented by formula: ##STR35## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; and R 2' represents a straight chain alkyl group having from 2 to 6 carbon atoms.
Claim 6
Dependent Claim
57 words
A liquid crystal compound as claimed in claim 1, wherein said compound is represented by formula: ##STR36## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; and R 2" represents a branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain.
Claim 7
Dependent Claim
126 words
A liquid crystal composition comprising a liquid crystal compound represented by formula (I): ##STR37## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; R 2 represents a straight chain alkyl group having from 2 to 6 carbon atoms or a branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain; m and n each represents 1 or 2, provided that m plus n is 3; and wherein said liquid crystal compound exhibits a spontaneous polarization value of 200 nC/cm 2 or higher in its chiral smectic phase; and a liquid crystal compound exhibiting an S c phase, wherein said liquid crystal compound is different from said compound of formula (I).
Claim 8
Dependent Claim
126 words
A liquid crystal composition comprising a liquid crystal compound represented by formula (I): ##STR37## wherein R 1 represents a straight chain alkyl group having from 4 to 18 carbon atoms; R 2 represents a straight chain alkyl group having from 2 to 6 carbon atoms or a branched alkyl group having from 3 to 6 carbon atoms and having a methyl group as a side chain; m and n each represents 1 or 2, provided that m plus n is 3; and wherein said liquid crystal compound exhibits a spontaneous polarization value of 200 nC/cm 2 or higher in its chiral smectic phase; and a liquid crystal compound exhibiting an S c phase, wherein said liquid crystal compound is different from said compound of formula (I).
Claim 9
Dependent Claim
33 words
A liquid crystal composition according to claim 6, wherein said compound of formula (I) is added to said different liquid crystal compound in a proportion of from about 5 to 20% by weight.
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