The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 28, 1999
Filed:
Apr. 16, 1998
Walter Schafer, Leichlingen, DE;
Knud Reuter, Krefeld, DE;
Hanns-Peter Muller, Odenthal, DE;
Hans-Ulrich Meier-Westhues, Leverkusen, DE;
Ulrich Freudenberg, Pulheim, DE;
Lothar Kahl, FRACC Atizapan de Zaragoza, MX;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
The present invention relates to polyisocyanate-modified dicarboxylic acid derivatives obtainable by reacting organic polyisocyanates with excess quantities, based on the equivalent ratio of NCO/COOH groups, of dicarboxylic acid (poly)anhydrides containing free carboxyl groups and water. The present invention also relates to coating compositions, in particular powder coating compositions, containing these polyisocyanate-modified dicarboxylic acids as curing agents for resins containing epoxy groups.