MODIFIED POLYVINYLACETALS WITH LOW SOLUTION VISCOSITY

摘要

The invention relates to modified polyvinyl acetals by saponification of 1 - alkylvinyl acetate-vinyl acetate copolymers, which contain 1 - alkylvinyl acetate/ vinyl acetate in a weight ratio of 1/99 -40/60 and subsequent acetalization the saponification products containing at least 80 % units of vinyl alcohol and 1 - alkyl vinyl alcohol with one or more aliphatic aldehydes with 1-6 C atoms under acid catalysis in an aqueous and/or organic medium; as well as to a method for the manufacture and the use thereof, especially in printing inks.