New processable polyaromatic ether‐keto‐sulfones as colorless, clear film‐forming materials

New processable polyaromatic ether‐keto‐sulfones were prepared from 4,4′‐diphenoxydiphenyl sulfone, terephthaloyl chloride, isophthaloyl chloride, and bis‐p‐carboxyphenylacetylene dichloride (IV) in a Friedel‐Crafts‐type polymerization. The white polymers obtained form colorless, transparent, strong films and can be cast into a glass‐fiber laminate. One polymer was prepared which incorporated biphenylene‐2,6‐dicarboxylic acid dichloride as crosslinking sites; this heat‐cured polymer was completely insoluble in sulfuric acid.