Patents Examined by Mark Nagimo
  • Copolymers containing carboxyl groups and, if appropriate, tertiary amino groups, a process for their preparation and their use in coating materials
    Patent number: 5276104
    Abstract: The invention relates to copolymers containing carboxyl groups and having an acid number of 20 to 150 mg of KOH/g and a number average molecular weight of 2000 to 8000, which can preferably be prepared from copolymers containing hydroxyl groups by reaction with carboxylic anhydrides, to a process for their preparation and their use in coating agents. The copolymers contain a vinyl ester, a vinyl aromatic, a hydroxyalkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid, and optionally other monomers that may contain acid groups.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: January 4, 1994
    Assignee: BASF Lacke+ Farben Aktiengesellschaft[DE/DE
    Inventors: Peter Hoffmann, Werner A. Jung