Modified polyvinylacetals with low solution viscosity
AssigneeWacker Chemie AG
InventorsPeter Tschirner, Peter Heiling, Otto-Sebastian Huber, Guenter Braunsperger, Klaus Haefner, Georg Friedl
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Abstract
Modified polyvinyl acetals are prepared 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.
Claims12
A modified polyvinyl acetal obtained by saponification of a 1-alkylvinyl acetate-vinyl acetate copolymer which comprises 1-alkylvinyl acetate/vinyl acetate in a weight ratio of from 1/99 to 40/60 and subsequent acetalization of the saponification product comprising at least 80% by weight of vinyl alcohol and 1-alkylvinyl alcohol units with one or more aliphatic aldehydes having from 1 to 6 carbon atoms in the presence of an acid catalyst in an aqueous and/or organic medium.
A process for preparing modified polyvinyl acetals which comprises saponifying 1-alkylvinyl acetate-vinyl acetate copolymers comprised of 1-alkylvinyl acetate/vinyl acetate in a weight ratio of from 1/99 to 40/60, to form a partially or fully saponified 1-alkylvinyl acetate-vinyl acetate copolymer comprising at least 80% by weight of vinyl alcohol and 1-alkylvinyl alcohol units and acetalizing the partially or fully saponified alkylvinyl acetate-vinyl acetate copolymer with one or more aliphatic aldehydes having from 1 to 6 carbon atoms in the presence of an acid catalyst in an aqueous and/or organic medium.
Dependencies are inferred from the claim text.