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US 9,469,732 B2Granted
Method for producing low-halogen polybiphenylsulfone polymers
AssigneeBASF SE
InventorsMartin Weber, Christian Maletzko, Gerhard Lange, Jörg Erbes, Matthias Dietrich, Nicolas Inchaurrondo, Christoph Sigwart
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Abstract
The present invention relates to a process for the production of low-halogen-content polybiphenyl sulfone polymers, to the resultant polybiphenyl sulfone polymers, to polybiphenyl sulfone polymers having less than 400 ppm content of polymer-bonded halogen, to thermoplastic molding compositions comprising these polybiphenyl sulfone polymers, and to their use for the production of moldings, of fibers, of films, of membranes, or of foams.
Claims18
A polybiphenyl sulfone polymer obtained by a process comprising
- (a) providing components (a1) composed of at least one aromatic dihydroxy compound and (a2) composed of at least one aromatic sulfone compound having two halogen substituents, where component (a1) comprises 4,4′-dihydroxybiphenyl, and then
- (b) reacting component (a2) with a molar excess of component (a1) in a solvent, where water and/or a metal hydroxide is added during or after the reaction,
- wherein according to step (b) the addition of water and/or of a metal hydroxide takes place at a conversion of at least 90%, and
- wherein the polymer has less than 400 ppm content of polymer-bonded halogen.
1 more element
Dependencies are inferred from the claim text.