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

1993-05-26

1995-01-10

Tsang, Cecilia

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 55, 560 60, 560 61, 560 62, 560 63, 560 64, 560 65, 560 66, 560 73, 528 15, 528 25, 528 26, 528 27, 525479, 25229964, 25229965, 25229966, C07C 6976, C09K 1920, C09K 1912, C08G 7704

Patent

active

053809157

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, ##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.

REFERENCES:
patent: 4388453 (1983-06-01), Finkelmann et al.
patent: 4826954 (1989-05-01), Suzuki et al.
patent: 4950726 (1990-08-01), Yoshioka et al.
patent: 4981607 (1991-01-01), Okawa et al.
patent: 4997591 (1991-03-01), Heppke et al.
patent: 5098978 (1992-03-01), Riepl et al.
patent: 5138010 (1992-08-01), Keller et al.

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