High tilt ferroelectric liquid crystal compounds and compositions

US5866036A · kind A · utility

Assignee

• Displaytech, Inc. · US

Inventors

• Michael Wand · Boulder, US
• Rohini Vohra · Boulder, US
• David M. Walba · Boulder, US
• Sean D. Monahan · Madison, US

Key dates

• Filing date: Feb 2, 1994
• Grant date: Feb 2, 1999
• Expiry date: Feb 2, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3411
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Chiral nonracemic molecules which are useful as high tilt, high polarization and/or high birefringence FLC materials or are useful as components of such FLC materials and which have the following general structure are provided: EQU RO--(Ph.sub.1).sub.m --(A).sub.a --(Ph.sub.2).sub.n --(B).sub.b --(Ph.sub.3).sub.p --T where Ph.sub.1, Ph.sub.2 and Ph.sub.3 are, independently of one another, para-substituted aromatic ring groups selected from the group consisting of phenyl, monohalophenyl, pyridine, pyrimidine, diazine, or pyridizine; where m, n and p are either 0, 1 or 2, such that m+n+p=2 or 3; where A or B are either a triple bond or a --COO-- or --OOC-- group; where a and b are independently of one another either 1 or 0; where R is a branched alkyl or alkene group having from three to twenty carbon atoms; and PA1 where T is selected from the group consisting of --OR', --COOR', OR", COOR", or OOCR'": where R' is an alkyl, alkene, ether, thioether, or alkylsilyl group having from three to twenty carbon atoms wherein non-adjacent carbon atoms can be replaced with a double bond, --O--, --S--, or an (CH.sub.3).sub.2 --Si-- group; where R" is 2,3-alkylepoxide having four to twenty carbo…