Preparation of oxysulfonylated polyesters

摘要

Oxysulfonylated polyesters, well suited for conversion into oriented composite polyester films, are prepared by polycondensing a lower alkyl diester of at least one aliphatic dicarboxylic acid and a lower alkyl diester of at least one aromatic dicarboxylic acid bearing an oxysulfonyl substituent, and optionally a lower alkyl diester of at least one aromatic dicarboxylic acid, with at least one diol, in the presence of a catalytically effective amount of at least one titanium compound and at least one manganese carboxylate.