se of an epoxy-functional adduct prepared from triglycidyl iscyanurate or triglycidyl trimellitate as a crosslinker or hardener for carboxy-functional polyesters suitable for producing powder coatings

摘要

Solid adduct produced by reacting triglycidyl iscyanurate or triglycidyl trimellitate with a fluorinated cyclic monocarboxylic acid or with a monoester prepared by reacting a dicarboxylic anhydride with a fluorinated alcohol, hydroxybenzotrifluoride or a silanol (I) or silyl-substituted alcohol is used as a crosslinker or hardener for carboxy-functional polyesters suitable for producing powder coatings. The adduct has more than 2 epoxy groups per average molecular weight. Solid adduct produced by reacting triglycidyl iscyanurate or triglycidyl trimellitate with a fluorinated cyclic monocarboxylic acid or with a monoester prepared by reacting a dicarboxylic anhydride with a fluorinated alcohol, hydroxybenzotrifluoride or a silanol RnSi(OH)4-n (I) or silyl-substituted alcohol is used as a crosslinker or hardener for carboxy-functional polyesters suitable for producing powder coatings. The adduct has more than 2 epoxy groups per average molecular weight. R : an aliphatic, aromatic, alicyclic or heterocyclic group; n : 2 or 3. An independent claim is also included for the use of a liquid, semisolid or solid adduct having at least 0.3 epoxy groups per average molecular weight as an additive for coatings, where the adduct is produced by reacting an epoxide having at least two epoxy groups with a fluorinated carboxylic acid or anhydride or with a monoester prepared by reacting a dicarboxylic acid or anhydride with a fluorinated alcohol or hydroxybenzotrifluoride or with a perfluorocarboxylic acid F(CF2)mCOOH or with a monoester prepared by reacting a dicarboxylic anhydride or a silanol (I) or silyl-substituted alcohol. m : 5-21.