摘要:
New fluoroalkoxydiphenyl pyrimidines which are organic compounds having optically active groups, liquid crystal compositions containing the said compounds and electro-optic elements using the said compositions are provided.The compounds have the following general formula: ##STR1## wherein R.sup.1 is an alkyl or alkoxy group having 1-20 carbon atoms, a halogen atom or a cyano group, R.sup.2 is a straight-chain or branched chain alkyl group having 1-15 carbon atoms, --A-- is a group of ##STR2## X and Y independently indicate a hydrogen atom, a halogen atom or a cyano group, and * indicates that its carbon atom is an asymmetric carbon atom.
摘要:
An optically active compound exhibiting high speed response properties when used as a component of liquid crystal materials used in a liquid crystal display mode utilizing ferroelectricity, and a liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 represents alkyl, alkoxy or alkoxycarbonyl each of 2 to 18 C, R.sup.2 represents alkyl of 3 to 18 C or alkoxy of 1 to 18 C and A represents a member selected from a group of two directly bonded six-membered rings having a halogen atom, cyano group, methyl group or trifluoromethyl group attached thereonto and * represents an unsymmetric carbon atom.
摘要:
A novel liquid crystal compound exhibiting SC phase which, when added to an optically active liquid crystal, makes the resulting chiral smectic liquid crystal material exhibit superior performances in liquid crystal display elements utilizing the ferroelectricity of the material, and a chiral smectic C composition using the compound, which compound is expressed by the formula ##STR1## wherein R.sup.1 l represents an alkyl group of 7 to 12 carbon atoms and R.sup.2 represents an alkyl group of 5 to 12 carbon atoms.
摘要:
A novel liquid crystalline, halogen-containing heterocyclic compound having a characteristic that even when its S.sub.c * phase is supercooled, no other smectic phases appear, and a liquid crystal composition containing the same are provided, which compound is expressed by the formula ##STR1## wherein R.sub.1 and R.sub.2 each represent an alkyl group of 2 to 18 carbon atoms; X represents --N.dbd. or --CH.dbd.; Y represents F or Cl; n represents an integer of 0 to 10; and a symbol * represents an asymmetric carbon atom.
摘要:
A ferroelectric liquid crystal compound having superior properties and a chiral smectic liquid crystal composition are provided. The ferroelectric liquid crystal compound is expressed by the formula ##STR1## wherein R represents an alkyl group of 2-18 C; A, --COO-- or --OCO--; l and m each, 1 or 2 but l+m=2 or 3; n, an integer of 2-8; and symbol *, an asymmetric carbon atom.
摘要:
A liquid crystalline compound useful as a component of liquid crystal compositions for liquid crystal display elements, exhibiting ferroelectric liquid crystal phases over a broad temperature range including room temperature, and a liquid crystal composition containing the same are provided. The compound is a thioether compound of the formula ##STR1## wherein R.sup.1 is a 2-10C alkyl; R.sup.2 is methyl or ethyl; but the carbon number of R.sup.1 is always larger than that of R.sup.2 ; A is ##STR2## wherein X is H, halogen or CN; Y is a 1-18C alkyl or alkoxy; l is 1 or 2; and * indicates optically active carbon atom.
摘要:
A novel 3-substituted biphenyl compound useful as a component of chiral liquid crystal compositions useful for light-switching elements by the use of ferroelectric liquid crystals; a chiral liquid crystal composition containing the compound; and a light-switching element utilizing the composition are provided, which compound is expressed by the formula ##STR1## wherein either one of R.sup.1 or R.sup.2 represents an alkyl group of 4 to 18 carbon atoms having a methyl branch and the other thereof represents an alkyl group of 2 to 18 carbon atoms; X represents a halogen atom of F, Cl or Br or cyano group; and l represents 0 to 1.
摘要:
A novel liquid crystal compound represented by the general formula (I): ##STR1## (wherein R is a straight or branched alkyl or alkoxy group having 1 to 20 carbon atoms, R* is an optically active alkyl group having 4 to 20 carbon atoms, X is a fluorine atom or a chlorine atom, and n is 1 or 2), a liquid crystal composition containing at least one liquid crystal compound of the general formula (I), a chiral smectic liquid crystal composition containing at least one liquid crystal compound of the general formula (I), and an optical switching element utilizing the chiral smectic liquid crystal composition containing at least one liquid crystal compound of the general formula (I) are described.
摘要:
A novel liquid crystal compound exhibiting SC phase which, when added to an optically active liquid crystal, makes the resulting chiral smectic liquid crystal material exhibit superior performances in liquid crystal display elements utilizing the ferroelectricity of the material, and a chiral smectic C composition using the compound. The compound is expressed by the formula ##STR1## wherein X represents F or Cl and R.sub.1 and R.sub.2 each represent a straight chain alkyl group of 1 to 18 carbon atoms.
摘要:
A novel liquid crystal compound exhibiting smectic phases and useful for display elements and a chiral smectic liquid crystal composition containing the compound are provided, which compound is expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group of 1 to 20 carbon atoms and X represents H atom or F atom, and which composition comprises at least one kind of the compounds of the formula (I) and an optically active compound.