Patents Represented by Attorney Frank C. Werner

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  • 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
  • Process for the production of a multi-layer paint coating and base paint for the base coat of a multi-layer paint coating
    Patent number: 5256453
    Abstract: A process for the production of a multi-layer paint coating in which base paints are employed which contain 5 to 20% by weight of crosslinked polymer microparticles, 2 to 15% by weight of a cellulose ester and 5 to 20% by weight of an epoxidized fatty acid ester, the weight percentages relating to the total content of nonvolatile constituents, excluding pigments and inorganic fillers, and the cellulose ester being so selected that a solution of 15 parts by weight of the cellulose ester in 85 parts by weight of a 9:1 mixture of acetone and ethanol at 23.degree. C. has a viscosity of 200 to 600 mPa.s.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: October 26, 1993
    Assignee: BASF Lacke + Farben Aktiengesellschaft
    Inventors: Monika Heithorn, Stefan Wieditz, Gerold Mahr, Arnold Dobbelstein, deceased