The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1992
Filed:
Dec. 15, 1989
Yasuyuki Goto, Chiba, JP;
Kisei Kitano, Chiba, JP;
Chisso Corporation, Osaka, JP;
Abstract
A liquid crystal compound is provided, having a large optical anisotropy .DELTA.n value and yet a low viscosity, and which can be added to a liquid crystal composition, without lowering the NI point of the composition and raising the viscosity thereof, while raising the .DELTA.n value thereof. The liquid crystal compound is a 4-substituted-4'-(1-alkynyl)tolan expressed by the formula ##STR1## wherein R.sup.1 and R.sup.2 each is 1-8C alkyl and one CH.sub.2 group or two non-adjacent CH.sub.2 groups present therein may be replaced by any one of O, --CO--, --CO--O--, --O--CO-- or --CH.sub.2 .dbd.CH.sub.2 --; --A-- is unsubstituted 1,4-phenylene, 1,4-phenylene having one or two F, Cl or Br atoms or CN groups, 1,4-cyclohexylene, pyrimidine-2,5-diyl or 1,3-dioxane-2,5-diyl; X is --COO--, --OCO--, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.CH-- or a single bond; n is 0 or 1 and when n is 0, X is a single bond; and Y is H or F.