Process for the production of polyvinyl butyral having improved properties

摘要

A process for the preparation of a polyvinyl butyral having improved properties comprises subjecting a polyvinyl alcohol in an aqueous medium in the presence of butyraldehyde and an acid catalyst and ethoxylated alkylphenol sulfate having the formula C9H19-[O]C6H4-O-[]](CH2-CH2-O-[]])nSO3Na where n=6 or n=7 effective as an emulsifier, neutralizing the reaction mixture to a pH of between 9 and 11, and thereafter recovering the polyvinyl butyral by separating it from the reaction liquor and thoroughly washing it with water.