Search International and National Patent Collections

1. (WO1998049171) OPTICALLY ACTIVE MONOMER, LIQUID CRYSTALLINE POLYMER, AND OPTICAL ELEMENT

Pub. No.:    WO/1998/049171    International Application No.:    PCT/JP1998/001934
Publication Date: Fri Nov 06 00:59:59 CET 1998 International Filing Date: Tue Apr 28 01:59:59 CEST 1998
IPC: C07D 493/04
C08F 20/26
C08F 20/30
C09K 19/34
C09K 19/38
G02B 5/30
Applicants: NITTO DENKO CORPORATION

IZUMI, Kyoko

NAKANO, Shusaku

MOCHIZUKI, Amane

Inventors: IZUMI, Kyoko

NAKANO, Shusaku

MOCHIZUKI, Amane

Title: OPTICALLY ACTIVE MONOMER, LIQUID CRYSTALLINE POLYMER, AND OPTICAL ELEMENT
Abstract:
A liquid crystalline polymer which is prepared from a monomer having a large twisting force, has an excellent film-forming property, can easily regulate the spiral pitch of a cholesteric phase, can form Grandjean alignment in a good monodomain state by effecting alignment in a short time of several minutes, and can be stably fixed in a vitreous state; and a circular dichroic optical element which is represented by general formula (a), comprises a solidification product of a liquid crystalline polymer, is thin, lightweight and less likely to cause a change in alignment states, such as pitch, at a practical temperature, and has excellent durability and storage stability. The optically active monomer is represented by general formula (a) wherein R1 represents hydrogen or a methyl group; and A and B represent each an organic group. The liquid crystalline polymer is of side chain type and comprises structural units comprising the optically active monomer. The optical element comprises a solidified layer of a Grandjean-aligned cholesteric liquid crystal phase comprising the polymer and exhibits circular dichroism.