Dainippon Ink and Chemicals, Incorporated

Hitachi, Ltd.

Makoto Sasaki

Haruyoshi Takatsu

Hisato Sato

Kiyofumi Takeuchi

Yasuyuki Tanaka

Kiyohumi Takeuchi

Haruyoshi Sasaki

Yoji Ishibashi

Yoshihiro Uchiyama

Hidetoshi Nakata

Hidetoshi Akimoto

Taiji Inui

Kazuhisa Toriyama

Tamihito Nakagomi

Tuneo Shimamura

A method of increasing helical twisting power (HTP) in an optically active compound used in a liquid crystal material is provided. An optically active compound which exhibits a large HTP value is also provided. Furthermore, a liquid crystal composition which exhibits a high upper temperature limit of the liquid crystal after the addition of the optically active compound, and a liquid crystal display device using the same are provided. In a method, an HTP of a compound having a partial structure represented by formula (A), which has an asymmetric carbon atom, is increased by replacing the partial structure represented by formula (A) by a partial structure represented by formula (B) (wherein * represents the position of an asymmetric carbon atom, Yrepresents a substituent such as an alkyl group and a halogen). A compound is represented by formula (I): 

Method of increasing helical twisting power, optically active compound, liquid crystal compostion containing the same, and liquid crystal display device

A cyano-substituted compound containing an ether bond is described, which is represented by formula (I): ##STR1## wherein R represents a straight-chain alkyl group having from 1 to 5 carbon atoms; X represents a hydrogen atom or a fluorine atom; n represents an integer of 2 to 8; m represents 1 or 2; and the cyclohexane ring is arranged at a trans-configuration.

Cyano-substituted compound containing ether bond

A fluorine-substituted compound containing an ether bond is disclosed, which is represented by formula ##STR1## wherein R represents a straight chain alkyl group having from 1 to 5 carbon atoms; m represents an integer of from 1 to 7; X represents hydrogen atom or fluorine atom; Y represents a connecting group selected from a group consisting of ##STR2## and the cyclohexane ring represents a trans(equatorial-equatorial) cyclohexane ring.

Fluorine-substituted compound containing ether bond

A compound represented by the following general formula (I). ##STR1## wherein R.sup.1 and R.sup.2 represent independently a straight-chain alkyl group having from 1 to 10 carbon atoms; X represents a direct bond, --CH.sub.2 CH.sub.2 --, ##STR2## n represents an integer of from 1 to 5; and ##STR3## represents a cyclohexane ring in trans configuration. A nematic liquid crystal mixture containing a compound of formula (I) is also disclosed.

Alkylene glycol derivative and liquid crystal mixture containing the same

A fluorine-substituted compound containing an ether bond and an intermediate thereof are described, which are represented by: ##STR1## wherein R represents a straight-chain alkyl group having 1 to 8 carbon atoms; n represents an integer of 2 to 7; m represents 1 or 2, X represents a hydrogen atom or a fluorine atom, and ##STR2## represents a trans-(equatorial-equatorial)cyclohexane ring. A compound represented by formula (II): ##STR3## wherein R represents a straight-chain alkyl group having 1 to 8 carbon atoms; n represents an integer of 2 to 7; m represents 1 or 2, ##STR4## represents a trans-(equatorial-equatorial)cyclohexane ring.

Intermediate for preparing fluorine-substituted compound containing

A fluorine-substituted compound containing an ether bond and an intermediate thereof are described, which are represented by: ##STR1## wherein R represents a straight-chain alkyl group having 1 to 8 carbon atoms; n represents an integer of 2 to 7; m represents 1 or 2, X represents a hydrogen atom or a fluorine atom and ##STR2## represents a trans-(equatorial-equatorial)cyclohexane ring. A compound represented by formula (II): ##STR3## wherein R represents a straight-chain alkyl group having 1 to 8 carbon atoms; n represents an integer of 2 to 7; m represents 1 or 2, ##STR4## represents a trans-(equatorial-equatorial)cyclohexane ring.

Fluorine-substituted compound containing ether bond and intermediate

Novel optically active tolan derivative represented by the general formula (I) and process for preparing thereof; ##STR1## (wherein all the symbols are the same as defined in the appended claims) are disclosed. These are effective for use in preparation of liquid crystal material capable of effectively preventing the formation of the cross-talk phenomenon due to changes due to temperature in the high level multiplexing driving system.

Optically active tolan derivatives

An optically active compound represented by formula (I): ##STR1## wherein R represents a straight chain alkyl group having from 2 to 12 carbon atoms; R' represents a straight chain alkyl or alkoxy group having from 1 to 20 carbon atoms; C represents an asymmetric carbon atom; A represents ##STR2## and X and Y each represents a hydrogen atom or a fluorine atom, provided that X and Y do not simultaneously represent a fluorine atom. The compound (I) reduces a temperature dependence of the threshold voltage of a nematic liquid crystal composition when added thereto in a small amount.

Optically active pyridines useful in liquid crystal form for electrical

A liquid crystalline compound of the general formula ##STR1## R and R', independently from each other, represent a linear alkyl group havng 1 to 10 carbon atoms, an alkoxymethylene group whose alkoxy moiety has 1 t 10 carbon atoms, a cyano group or a halogen atom, and n and m, independently from each other, represent 0 to 1.

Tolan-type nematic liquid crystalline compounds

Optically active tolan compounds of the formula ##STR1## wherein R and R' are straight chain alkyl and n is 0 or 1, are useful in the preparation of liquid crystalline materials capable of effectively preventing cross-talk due to temperature changes in high level, multiplexing driving systems.

Novel optically active tolan derivatives

An optically active benzoic ester derivative represented by the general formula: ##STR1## wherein R represents a straight chain alkyl group having from 1 to 20 carbon atoms; R' represents a straight chain alkyl group having from 2 to 8 carbon atoms; rings A and B each represents ##STR2## or a trans-1,4-cyclohexane ring; n represents 0 or 1; and C represents an asymmetric carbon atoms. The compounds of formula (I) are capable of providing a chiral nematic liquid crystal composition having a short spiral pitch when added to a nematic liquid crystal composition in a small amount and are useful in the production of SBE display devices having excellent performances in a high level multiplexing driving system.

Optically active benzoic ester derivatives

A novel optically active compound of the formula ##STR1## is capable of forming a chiral nematic liquid crystal composition having short spiral pitch by adding a small amount of it to a generally nematic liquid crystal composition. The compound of this invention is useful in the manufacture of SBE display device which is excellent especially in high level multiplexing driving system.

Optically active tolan derivative

A liquid crystalline compound of the general formula ##STR1## wherein ##STR2## represents ##STR3## R and R', independently from each other, represent a linear alkyl group having 1 to 10 carbon atoms, an alkoxymethylene group whose alkoxy moiety has 1 to 10 carbon atoms, a cyano group or a halogen atom, and n and m, independently from each other, represent 0 or 1.

A liquid crystalline compound of the general formula ##STR1## wherein ##STR2## R and R', independently from each other, represent a linear alkyl group having 1 to 10 carbon atoms, an alkoxymethylene group whose alkoxy moiety has 1 to 10 carbon atoms, a cyano group or a halogen atom, and n and m, independently from each other, represent 0 or 1.

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Urawa, Japan

Makoto Sasaki