Chisso Corporation

Kazunori Nigorikawa

Shigeru Sugimori

Yasuyuki Goto

Toyoshiro Isoyama

Tetsuya Ogawa

Kisei Kitano

Naoyuki Yoshida

Yoshito Furukawa

Tetsuhiko Kojima

A novel phenylpyridine derivative which exhibits a positive dielectric anisotropy and is useful as a component of liquid crystal materials and also has a broad temperature range of liquid crystal phases, a high clearing point and a superior compatibility with other liquid crystal compounds or liquid crystal compositions, and a composition containing the derivative are provided. The phenylpyridine derivative is expressed by the formula ##STR1## wherein R represents an alkyl group of 1 to 10 carbon atoms, X represents H or F; Y represents F, --CN or an alkyl group or an alkoxy group of 1 to 10 carbon atoms; and m represents 0 or 1.

Phenylpyridine derivative

Novel compounds which, when used as a components of liquid crystal compositions, have good compatibility with other components and also have large values of dielectric anisotropy and optical anisotropy, and liquid crystal compositions containing the same are provided, which compounds are 4'-cyano-3'-halogenophenyl 4-(5-substituted-pyrimidin-2-yl)benzoate expressed by the formula ##STR1## wherein R represents an alkyl group of 1 to 10 carbon atoms or --(CH.sub.2).sub.m --O--(CH.sub.2).sub.p --CH.sub.3 wherein m and p each represent an integer of 0 to 8 and m+p.ltoreq.8, and X represents a halogen atom.

4'-cyano-3'-halogenophenyl 4-(5-substituted-pyrimidin-2-yl)benzoate

A compound which, when added as a component to other components, raises the N-I point of the resulting liquid crystal composition and nevertheless affords only a relatively small rise in viscosity of the composition, and a liquid crystal composition containing the same are provided, which compound is a 1-(trans-4'-alkylcyclohexyl)-2-4'-[trans-4''-(trans-4''-alkylcyclohexyl)cy clohexylphenyl]ethane expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group of 1 to 10 carbon atoms.

Novel liquid crystal compound for high temperatures

A novel pyridine derivative which, when added to liquid crystal substances, can improve various specific features required for the resulting liquid crystal compositions, and a liquid crystal composition containing the same are provided, which pyridine derivative is expressed by the formula ##STR1## wherein W represents H or F; X, F, Cl or alkyl or alkoxy of 1.about.10 C; ##STR2## n, 0 or 1; Y, CN or alkyl or alkoxy of 1.about.10 C; Z, F, Cl or H; and when Z is F or Cl, Y is limited to CN, excluding certain identified compounds.

Pyridine derivatives and their use in liquid crystals

A novel pyrimidine derivative which, when used as a component of a liquid crystal composition, is useful for driving a liquid crystal cell containing the composition at low voltages, and a liquid crystal composition containing the same are provided, which pyrimidine derivative is expressed by the formula ##STR1## wherein n represents an integer of 0 or 1; R represents an alkyl or alkoxy group of 1 to 10 carbon atoms; and X.sub.1, X.sub.2 and X.sub.3 each represent hydrogen atom, F, Cl or Br as halogeno group, cyano group or trifluoromethyl group and at least one of X.sub.1, X.sub.2 and X.sub.3 is trifluoromethyl group.

Pyrimidine derivative and liquid crystal composition containing same

A novel liquid crystal compound useful as a component of liquid crystal compositions and a liquid crystal composition containing the same are provided, which compound is a phenoxypropanol ester derivative expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group or an alkoxy group each of 1 to 15 carbon atoms, F atom, Cl atom or CN group, but either one of R.sup.1 and R.sup.2 is necessarily said alkyl group or alkoxy group: A represents ##STR2## and B represents ##STR3##

Phenoxypropanol ester derivative

A novel liquid crystal compound which is superior in compatibility with other liquid crystal compounds or liquid crystal compositions, chemically stable, and when added to liquid crystal compositions, can raise the clearing point thereof almost without increasing the viscosity and enhance .DELTA..epsilon. and .DELTA.n thereof, and a liquid crystal composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms; Y represents F, Cl or H; and Z represents F, Cl, cyano group or an alkyl group or an alkoxy group each of 1 to 10 carbon atoms.

Novel liquid crystal compound

A novel organic compound usable as a component of liquid crystal compositions having a positive value of dielectric anisotropy and a liquid crystal composition usable as a material for liquid-crystalline display devices operated under a low driving voltage are provided which compound is a benzoic acid ester derivative expressed by the formula ##STR1## wherein R represents an alkyl group of 1 to 10 carbons and X represents ##STR2##

Benzoate derivatives having a large positive dielectric anisotropy value

A novel ester derivative affording a positive large dielectric anisotropy value (.DELTA..epsilon.) of liquid crystal compositions and also reducing the optical anisotropy value (.DELTA.n) thereof when the derivative is contained therein, and a liquid crystal composition containing the ester derivative are provided, which ester derivative is expressed by the formula ##STR1## wherein R represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms and X represents F or Cl.

Ester derivative having a positive dielectric anisotropy

A novel compound usable as a component constituting liquid crystal materials having a positive dielectric anisotropy value and a liquid crystal composition containing the same are provided, which compound is an alcohol derivative expressed by the general formula ##STR1## wherein R.sup.1 represents a hydroxyalkyl group of 1 to 10 carbon atoms having hydroxyl group at the end or an intermediate position thereof; R.sup.2 represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms or --C.tbd.N; and ##STR2## represents ##STR3## and when R.sup.2 represents --C.tbd.N, ##STR4## represents ##STR5##

Alcohol derivatives

A novel pyridine derivative capable of increasing the dielectric anisotropy value (.DELTA..epsilon.) or optical anisotropy value (.DELTA.n) of liquid crystal compositions including the derivative and lowering the driving voltages of liquid crystal display elements using the composition, and also a liquid crystal composition containing the pyridine derivative are provided, which pyridine derivative is expressed by the formula

Novel liquid crystal compounds and liquid crystal compositions

A novel 1,4-dipyrimidinylbenzene derivative which is useful as a component constituting a liquid crystal composition which is superior in properties and also physically and chemically stable, as a material for liquid crystal display elements, and a liquid crystal composition containing the same are provided, which derivative is expressed by the formula ##STR1## wherein X represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms, methylthio group or cyano group and Y represents an alkyl group or an alkoxy group each of 1 to 10 carbon atoms.

1,4-dipyrimidinylbenzene derivative

Novel liquid crystal compounds having a large positive dielectric anisotropy value and also a low viscosity and a good stability to heat, light, air and water, and liquid crystal compositions containing the same are provided, which compounds are fluorobenzene derivatives expressed by the general formula ##STR1## wherein n represents 1 or 2, X represents CN or COCH.sub.3, and R represents hydrogen atom or an alkyl group or an alkoxy group each of 1 to 15 carbon atoms.

Fluorobenzene derivatives and liquid crystal compositions containing the

A liquid crystal substance having a high nematic-clearing point and a broad nematic temperature range and yet a low viscosity, and a composition containing the same, are provided, which substance is 4-unsubstituted or substituted-4'-cyano-trans,trans,trans-tercyclohexanes expressed by the general formula ##STR1## wherein R represents hydrogen atom or an alkyl group of 1 to 10 carbon atoms.

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Yokohamashi, Japan

Kazunori Nigorikawa