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US 4,377,681 AGranted
Liquid crystal copolyesters
AssigneeMonsanto Company
InventorOliver D. Deex
Life of this patent
Estimating the term…
Abstract
Disclosed are liquid crystal copolyesters prepared from p-hydroxybenzoic acid, isophthalic acid, hydroquinone and 2,2-bis(4-hydroxyphenyl) propane.
Claims4
A copolyester capable of forming a thermotropic melt phase at a temperature below about 340.degree. C. and having a glass transition temperature of at least about 160.degree. C. and an inherent viscosity determined at 30.degree. C. with a solution of 0.5 gram of copolyester per 100 ml of a solvent composed of 60 parts by weight of phenol and 40 parts by weight of tetrachloroethane of at least about 0.3, consisting essentially of the following divalent radicals:
- ##STR2## wherein the range of radical A is from 10 to 40 mol percent of the copolyester and the range of radical C is from 82 to 95 mole percent, of the total of radicals C and D.
Dependencies are inferred from the claim text.