Modified polyvinylacetals with low solution viscosity

US6211289A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Peter Tschirner · Emmerting, DE
• Peter Heiling · Burghausen, DE
• Otto-Sebastian Huber · Burghausen, DE
• Guenter Braunsperger · Haag in Oberbayern, DE
• Klaus Haefner · Marktl, DE
• Georg Friedl · Burghausen, DE

Key dates

• Filing date: Nov 25, 1998
• Grant date: Apr 3, 2001
• Expiry date: Nov 25, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2800/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.