COPOLYMER HAVING LIQUID CRYSTAL GROUP IN THE SIDE CHAIN
申请人:SAGAMI CHEMICAL RESEARCH CENTER
公开号:EP0695770A1
公开(公告)日:1996-02-07
A copolymer having a polyacrylate skeleton as the main chain and a liquid crystal group in the side chain, which copolymer has a number-average molecular weight of 1,000 or above and is composed of repeating acrylate units (I) each having a liquid crystal group bonded thereto by means of an ester linkage via an alkylene chain and repeating acrylate units (II) each having a liquid crystal group bonded thereto by means of an ester linkage via an alkylene chain having a siloxane linkage in a molar ratio of the units (I) to the units (II) of 95/5 to 20/80. This copolymer is a side-chain type of polymer liquid crystal which exhibits liquid crystallinity at a comparatively low temperature, i.e., around room temperature, and is useful as the material of large-area display elements that are driven at low temperature, optical shutters, light-modulating glass, and so forth.
Mesogenic acrylate copolymers having both siloxy and alkylene spacer
申请人:Sagami Chemical Research Center
公开号:US05554706A1
公开(公告)日:1996-09-10
The present invention relates to a copolymer consisting of a polyacrylate type backbone having mesogenic groups in the side chains, which comprises an acrylate type repeating unit (I) wherein a mesogenic group is bonded by an ester linkage via an alkylene chain, and an acrylate type repeating unit (II) wherein a mesogenic group is bonded by an ester linkage via an alkylene chain containing a siloxane bond; the molar ratio of the repeating unit of the formula (I) to the repeating unit of the formula (II) ranging from 95/5 to 20/80 and the number average molecular weight being at least 1,000. The copolymer of the present invention exhibits liquid crystallinity at a relatively low temperature, i.e., around a room temperature. Accordingly, the polymer is useful for a display material of a large area, a light-shuttering material and a light-controlling glass material.