Liquid crystalline bis-chlorocarbonic acid esters, a process for

Details Liquid crystalline bis-chlorocarbonic acid esters, a process for Liquid crystalline bis-chlorocarbonic acid esters, a process for

1989-02-27

1990-12-25

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528196, 528209, 528288, 528300, 528370, 528372, C08G 7704

Patent

active

049804413

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 form (I) are other invention embodiments.

REFERENCES:
patent: 2731445 (1956-01-01), Wittbecker
patent: 3391111 (1968-07-01), Morgan
patent: 3729447 (1973-04-01), Haberland
patent: 4222910 (1980-09-01), Tokuda

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