BigPatents India

Process for preparing polyvinyl acetals The invention provides a process for preparing polyvinyl acetals by means of acetalization, with one or more aldehydes from the group consisting of aliphatic and aromatic aldehydes having 1 to 15 carbon atoms, of partly hydrolysed or fully hydrolysed vinyl ester polymers of one or more monomers from the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 carbon atoms with
50 mol% of vinyl alcohol units, characterized in that the partly hydrolysed or fully hydrolysed vinyl ester polymers are initially charged in solution or in slurry in the aldehyde.