Pulverulent coating materials

Claim 1

In a powder lacquer binder consisting of a mixture of A. at least one polyepoxide having an average of at least two epoxide groups per molecule or a mixture thereof with a polyoxazoline and B. at least one polyester resin which contains free carboxyl groups and has an acid number of 30 to 85 and a softening point above 40°C., the improvement wherein each said polyester resin is the condensation product of an acid anhydride consisting essentially of at least one non-aromatic dicarboxylic acid anhydride wherein at least 50 mol % of said dicarboxylic acid anhydride is succinic acid anhydride and at least one polyester resin having an OH number of about 40 to 100, said latter polyester resin being the condensation product of at least one polyalcohol and at least one aromatic dicarboxylic acid or said condensation product having up to 30 mol % of said aromatic dicarboxylic acid replaced with at least one cycloaliphatic dicarboxylic acid, at least one aliphatic dicarboxylic acid or a mixture thereof, said (A) being present in an amount to provide at least one epoxide group for each free carboxyl group of (B) or being present in an amount to provide a combined number of epoxide groups and oxazoline groups at least equal to the total number of free carboxyl groups of (B).