Abstract: A liquid crystal material containing polymer network forming material is microencapsulated by a method utilizing an interfacial polymerization which creates a combination of polyurethane and polyurea polymers or melamine fromaldehyde or urea formaldehyde polymer which form the capsule walls surrounding the discrete liquid crystal droplets. The prepolymer of urethane acrylate and acrylate within the liquid crystal capsules is cured under UV light irradiation to form a web-like structure and induce the formation of polydomain configuration of nematic director. This allows to produce the display having faster switching property and showing significant lower threshold voltage.

Abstract: Briefly, according to one aspect of the invention, liquid crystal material is microencapsulated by a method utilizing an interfacial polymerization reaction which creates a combination of polyurethane and polyurea polymers which form the capsule walls surrounding the discrete liquid crystal droplets. The formed capsule walls are designed to have an adjustable refractive index so as to allow for the matching of the refractive index to that of the liquid crystal and polymeric binder materials. This allows for the production of a liquid crystal droplet surrounded by polymer film, which is optically clear when the liquid crystal director is aligned with the electric field. The microencapsulated liquid crystal droplets improves the dye stability of a dichroic dye and enhances the contrast of a liquid crystal display.

Abstract: Briefly, according to one aspect of the invention, liquid crystal material is microencapsulated by a method utilizing an interfacial polymerization reaction which creates a combination of polyurethane and polyurea polymers which form the capsule walls surrounding the discrete liquid crystal droplets. The formed capsule walls are designed to have an adjustable refractive index so as to allow for the matching of the refractive index to that of the liquid crystal and polymeric binder materials. This allows for the production of a liquid crystal droplet surrounded by polymer film, which is optically clear when the liquid crystal director is aligned with the electric field. The microencapsulated liquid crystal droplets improves the dye stability of a dichroic dye and enhances the contrast of a liquid crystal display.

Abstract: Substituted-hydrocarbylthio phenyl-pyrimidines are disclosed which exhibit smectic A phases over a wide temperature range and are useful in formulating smectic A compositions. The liquid-crystal compositions formulated utilizing the smectic A compounds of the present invention have particular application in smectic cells such as laser smectic liquid-crystal light valves and optical limiters used in high performance environments.

Abstract: Disclosed are compounds of the formula: ##STR1## wherein R is an alkyl group having 1 to 8 carbon atoms and X is a dioxane, cyclohexane, or benzene ring. The compounds of the invention are suitable as liquid crystal materials in electrooptical displays. Specifically, when added to nematic liquid crystals, these compounds provide an increase in the positive dielectric anisotropy of the liquid crystal composition.

Abstract: Disclosed are compounds of the formula: ##STR1## wherein R.sub.1 is an alkyl group having 1 to 10 carbon atoms and R.sub.2 is either an alkyl or alkoxy group having 1 to 10 carbon atoms or a cyano group or a nitro group. The compounds of the invention are suitable as liquid crystal materials in electrooptic displays. Specifically, these compounds provide a wide mesomorphic range and a high clearing point when added to nematic liquid crystal mixtures used in multiplexed electrooptical displays.

Abstract: The invention provides a nematic liquid crystal composition useful in electro-optical display devices, the composition comprising:4-cyanophenyl-4'-butylbenzoate: 15-30 mole%4-cyanophenyl-4'-heptylbenzoate: 20-40 mole%4-pentylphenyl-4'-pentylbenzoate: 20-35 mole%4-pentylphenyl-4'-(4"-pentylbenzoyloxy)-benzoate: 10-15 mole%4-cyano-4'-pentylbiphenyl: 10-20 mole%chiral additive: 0.05-0.8 mole%.

Abstract: An optically active chiral nematic compound of the general formula: ##STR1## wherein n varies from 1-5, and R.sub.1 is a radical selected from the group consisting of an n-alkyl group, an n-alkoxy group, an n-acyloxy group, an n-alkyl carbonato group, a cyano group, and a nitro group. Where R.sub.1 contains an alkyl group, it includes from 1 to 8 carbon atoms. The above compound comprises an amount of 0.2 to 2 weight percent in a mixed ester liquid crystal composition with a nematic temperature range of at least 0.degree. to 50.degree. C, said chiral and mixed ester compositions being miscible in each other. A nematic mixed ester liquid crystal composition comprising (a) a mixture of specific alkylphenyl benzoates and (b) a mixture of cyanophenyl benzoates. All of the foregoing compositions being useful as liquid crystals for electro-optical display devices and the like.