Nematic liquid crystal compounds and compositions

Details Nematic liquid crystal compounds and compositions Nematic liquid crystal compounds and compositions

C - Chemistry, Metallurgy

09

B

31/105, 260/154

C09B 55/00 (2006.01) C09K 19/26 (2006.01) C09K 19/48 (2006.01)

Patent

CA 1051421

Abstract of the Disclosure: New nematic liquid crystal compounds with positive dielectric anisotrophy, represented by the formula Image wherein R is n-butyl, n-pentyl, n-hexyl, n-heptyl or n-octyl group are obtained by condensing p-n- alkylnitrosobenzenes with p-cyanoanilines and oxidizing the resulting p-n-alkyl-p'-cyanoazobenzenes with peracetic acid. Nematic liquid crystal compositions with positive dielectric anisotrophy, having a nematic liquid crystal phase over a broad temperature range are obtained by mixing two or more of p-n-alkyl-p'-cyanoazoxybenzenes of the above formula. Also, an useful nematic liquid crystal composition with positive dielectric anisotrophy which exhibits its nematic liquid crystal phase over a broad temperature range, including room temperature can be obtained by mixing at least one of Schiff base type or azoxy type compounds in a suitable ratio. The liquid crystals disclosed may be used for a torsion effect type display device which exhibits a nematic liquid crystal phase over a broad temperature range including room temperature.

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