Method for producing low-chlorine polybiphenyl sulfone polymers

摘要

The present invention relates to a process for the production of low-chlorine-content polybiphenyl sulfone polymers, to the polybiphenyl sulfone polymers obtainable in this way, to polybiphenyl sulfone polymers with less than 800 ppm content of organically bonded chlorine, to thermoplastic molding compositions and moldings, fibers, films, membranes, or foams comprising the polybiphenyl sulfone polymers mentioned, and also to their use for the production of moldings, of fibers, of films, of membranes, or of foams.

主权项

1. A polybiphenyl sulfone polymer that is a polymerization product of at least one aromatic dihydroxy compound and 4,4′-dichlorodiphenyl sulfone, and the polymerization is carried out with a molar excess of the aromatic dihydroxy compound at a molar ratio of the aromatic dihydroxy compound to 4,4′-dichlorodiphenyl sulfone of from 1.01 to 1.05, the polymer with less than 800 ppm content of polymer-bonded chlorine as determined by atomic spectroscopy.