Liquid crystal compound
AssigneesSeiko Instruments Inc., Teikoku Chemical Industry Co., Ltd.
InventorsMasaaki Taguchi, Takamasa Harada, Hitoshi Suenaga
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Abstract
The present invention is an optically active liquid crystal compound shown in the following general formula; ##STR1## [wherein, A and B respectively show one of --, --O--, ##STR2## (-- shows direct bond), one of R.sub.1 and R.sub.2 shows direct chain alkyl group and the other one shows either alkyl group having asymmetric carbon atom or alkoxy alkyl group having asymmetric carbon atom and ether bonding. Also, onto the asymmetric carbon atom, one of the groups --CH.sub.3, --CN, --Cl is added.] It is clear that there are many compounds in these liquid crystal compounds, that show Sm C* phase in a wide temperature range close to room temperature and that have high response speed.
Claims78
A ferroelectric liquid crystal compound of the formula ##STR149## wherein one of R.sub.1 and R.sub.2 is a straight chain alkyl group of 5 to 14 carbon atoms and the other is an alkyl or alkoxyalkyl group which contains just one asymmetric carbon atom, each of a and b is 0 or 1, one member of the group --CH.sub.3, --CN or --Cl is attached to the asymmetric carbon atom and each of A and B is --O--, ##STR150## wherein:
- when a is 0, B is --O-- and b is 1;
- when A is --O-- and a is 1, B is --O-- or ##STR151## and b is 0 or 1;
- when A is ##STR152## and a is 1, B is --O-- and b is 0 or 1, and when A is ##STR153## and a is 1, b is 0.
Dependencies are inferred from the claim text.