How to reach the polyepoxide in an epoxy resin or a thiophenol, a polyhydric thiophenol, a carboxylic acid, or accelerate the reaction of the carboxylic acid anhydride

摘要

Novel advanced epoxy resins are prepared using phosphine or phosphonium salt initiators bearing at least one hydroxyphenyl or thiophenyl groups. These phosphonium salt initiators are novel compositions of matter. The resulting resins contain reduced quantities of extractable phosphorus containing moieties.