Liquid-crystalline copolymer, process for the preparation of the

Details Liquid-crystalline copolymer, process for the preparation of the Liquid-crystalline copolymer, process for the preparation of the

1994-08-26

1995-06-20

Wu, Shean

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25219901, 544298, 544301, 544303, 544335, C09K 1934, C07D23902

Patent

active

054258979

ABSTRACT:
A liquid-crystalline copolymer comprising the repeating units represented by the following general formulas ##STR1## wherein each of r and p is an integer of 2 to 5, q is an integer of 0 to 3, m is an integer of 1 to 20, and R.sup.1 is ##STR2## R.sup.2 being --COOR.sup.3, --OR.sup.3 or --OCOR.sup.3, R.sup.3 being ##STR3## each of R.sup.4 and R.sup.5 being --CH.sub.3 or a halogen atom, each of a and d being an integer of 0 to 10, b being an integer of 0 or 1, with the proviso that d is not 0 when R.sup.5 is --CH.sub.3, the repeating units [I] and [II] being present in the liquid-crystalline copolymer in a substantial molar ratio [I]:[II] of 1:1, exhibits ferroelectricity even at a temperature neighboring room temperature and having a high response speed to changes of external electric fields.

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