Liquid crystalline bis-chlorocarbonic acid esters

Details Liquid crystalline bis-chlorocarbonic acid esters Liquid crystalline bis-chlorocarbonic acid esters

1990-06-26

1992-09-01

Garner, Vivian

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

Organic compounds

Halocarbonate esters

528 26, 528196, 528209, 528288, 528300, C07C 6996

Patent

active

051440555

ABSTRACT:
Liquid crystalline bis-chlorocarbonic acid esters are 4-hydroxybenzoic acid-(4'-hydroxyphenyl) esters corresponding to the following formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote, independently of one another, hydrogen, a halogen atom or a C.sub.1 to C.sub.6 alkyl group. Preparation of (I) and liquid crystalline N-alkyl polyurethanes and polycarbonates prepared from (I) are other invention embodiments.

REFERENCES:
patent: 2731445 (1956-01-01), Wittbecker
patent: 3211776 (1965-10-01), Stephens
patent: 3391111 (1968-07-01), Morgan
Chemical Abstracts, 82:163081j, 1975.

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