Synonyms: 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol and .alpha.-hydro-.omega.-hydroxypoly(oxy-1,4-butanediyl);polybutester;p-Benzenedicarboxylic acid/1,4-butanediol/ALPHA-hydro-OMEGA-hydroxypoly-(ox;1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol and α-hydro-ω-hydroxypoly( oxy-1,4-butanediyl);terephthalic acid/ butanediol derivative copolymer