Polyester of para-hydroxy benzoic acid, 1,4-bis(para- carboxyphenoxy) benzene, aromatic diol and aromatic diacid capable of undergoing melt processing

摘要

A novel polyester is provided which has been found to exhibit an optically anisotropic melt phase which enables it readily to undergo melt processing to form quality fibers, films, molded articles, etc. The polyester of the present invention contains recurring para-oxybenzoyl and para-phenylenedioxy-4,4'-dibenzoyl moieties in addition to moieties derived from at least one aromatic diol and at least one additional aromatic diacid in the proportions indicated. The hydrogen atoms present upon the aromatic rings derived from the aromatic diol and additional aromatic diacid optionally may be at least partially substituted (as described). The wholly aromatic polyester is capable of forming the desired anisotropic melt at a temperature below approximately 400° C., and in a preferred embodiment at a temperature below approximately 360° C.