Patent ID: 6063464
Filing Date: 2000-05-16
Classification: C08G,Y10T

Abstract:
A method for making a polyester polymer comprising:(1) combining in a reactor one or more monomers comprising a diacid moiety; a monomer comprising an isosorbide moiety; and one or more monomers comprising another diol moiety; with a condensation catalyst suitable for condensing diacids and diols; and(2) heating said monomers and said catalyst to a temperature sufficient to polymerize said monomers into a polyester polymer having at least said diacid moieties, said isosorbide moieties and said other diol moieties;wherein said heating is continued for a sufficient time to yield an isotropic polyester having an inherent viscosity of at least about 0.15 dL/g when measured as a 1% (weight/volume) solution of said polyester in o-chlorophenol at a temperature of 25.degree. C. and with the proviso that when said one or more monomers comprising a diacid moiety is terephthalic acid or dimethyl terephthalate, said one or more monomers comprising another diol moiety is not ethylene glycol or is ethylene glycol and a different diol.