Liquid crystalline polyesters and methods for their production.

摘要

A liquid crystalline polyester comprising dicarboxylic acid units of the following formula (1): wherein R<1> is a bivalent aromatic hydrocarbon group having from 6 to 18 carbon atoms, diol units of the following formula (2): -OCH2CH2O- (2) and p-oxybenzoic acid units of the following formula (3): wherein (i) where the moles of said units (1), (2) and (3) are represented by [1], [2] and [3], respectively, they satisfy the following formula (I): $(ii)\; where\; among\; the\; p-oxybenzoic\; acid\; units,\; (a)\; p-oxybenzoic\; acid\; units\; having\; on\; their\; -O-\; side\; a\; further\; p-oxybenzoic\; acid,\; are\; represented\; by\; the\; underlined\; portion\; of\; the\; formula\; (3-1):and\; (b)\; p-oxybenzoic\; acid\; units\; having\; on\; theirside\; a\; diol\; unit\; of\; the\; formula\; (2),\; are\; represented\; by\; the\; underlined\; portion\; of\; the\; formula\; (3-4):and\; the\; moles\; of\; (3-1)\; and\; (3-4)\; are\; represented\; by\; [3-1]\; and\; [3-4],\; respectively,\; at\; least\; one\; of\; r1\; and\; r2\; as\; defined\; by\; the\; following\; formulas\; (II)\; and\; (III):$ satisfies\; 0$$