Wacker-Chemie Gmbh

Peter Heiling

Peter Tschirner

Hermann Lutz

Thomas Bastelberger

Dieter Gorzel

Georg Friedl

Guenter Braunsperger

Klaus Haefner

Otto-Sebastian Huber

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.

Modified polyvinylacetals with low solution viscosity

Core/shell copolymer dispersion whose shell comprises hydrolyzable

The invention provides a coating composition for coating aluminum which is based on vinyl ester copolymers and an organic solvent, the vinyl ester copolymer comprising a) 20 to 90 parts by weight of a vinyl ester of saturated aliphatic monocarboxylic acids having 1 to 5 C atoms, b) 0 to 70 parts by weight of a vinyl ester of saturated aliphatic monocarboxylic acids which have 9 to 10 C atoms and a quaternary C atom in the .alpha.-position relative to the carboxyl group, c) 0.05 to 10 parts by weight of one or more ethylenically unsaturated mono- or dicarboxylic acids having 3 to 10 C atoms or anhydrides thereof and d) 0 to 50 parts by weight of one or more ethylenically unsaturated monomers, the homopolymers of which have a glass transition temperature above 30.degree. C. The coating composition is free of chlorine-containing polymers and also avoids the necessity for using a chlorine-containing primer.

Coating agents for coating aluminum

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Burghausen, Germany

Peter Heiling