Liquid crystal copolyester having blocked molecular chain terminal

Claim 1

A liquid crystal copolyester having a blocked molecular chain terminal, comprising a copolyester which exhibits anisotropy in a molten state and has a functional group located at the terminal of the molecular chain thereof and is blocked with a low-molecular compound having at least one aromatic ring and a molecular weight of 350 or less, wherein said low-molecular compound used for blocking said molecular chain terminal is at least one member selected from the compounds represented by following formulae (A) to (I): ##STR22## wherein R 1 and R 2 are each a substituent selected from alkyl having 1 to 10 carbon atoms, --Cl, --Br, --OCH 3 , --CN, --NO 2 , --NH 2 , vinyl, ethynyl, acrylate, phenyl, benzyl, alkylurea, alkyl ester, and maleimino; Y is a group selected from alkylene having 1 to 4 carbon atoms, alkylidene, --O--, --S--, --SO--, --SO 2 --, and --CO--; n is an integer of 1 to 2; and x is a functional group selected from aldehyde, hydroxyl, carboxyl, amino, imino, glycidyl ether, glycidyl ester, methyl, isocyanato, acetoxy, carboxyalkyl ester (wherein the alkyl has 1 to 4 carbon atoms) and carboxyphenyl ester.