CLEARCOAT COMPOSITION, METHOD FOR PRODUCTION AND USE

摘要

The present invention relates to a clearcoat composition containing (A) at least one polyester with an OH count of 80 - 250 mg KOH/g, containing (A1) 10 to 20 mol% of at least one acyclic, aliphatic, branched polyol having two hydroxyl groups, (A2) 5 to 15 mol% of at least one acyclic, aliphatic, branched polyol having three hydroxyl groups, (A3) 10 to 20 mol% of at least one acyclic, aliphatic, branched polyol having four hydroxyl groups, (A4) 25 to 40 mol% of at least one cyclo-aliphatic 1,2 dicarboxylic acid and/or the anhydride of this dicarboxylic acid, as well as (A5) 20 to 35 mol% isononanoic acid, wherein the specific molar fraction is based in each case on the overall molar fraction of the compounds (A1) to (A5) and this overall molar fraction is at least 70 mol% of the compounds contained in polyester (A); (B) at least one butanol etherified melamine-formaldehyde resin having a starting crosslinking temperature that is between 65°C and 100°C, lower than the starting crosslinking temperature of hexamethoxymethyl melamine; (C) at least one butanol-etherified melamine-formaldehyde resin having a starting crosslinking temperature that is between 30°C and 60°C, lower than the starting crosslinking temperature of hexamethoxymethyl melamine; (D) at least one organic urea compound as a rheological aid; and (E) at least one acid catalyst. In addition, the present invention relates to a method for producing the clearcoat composition, the use of the clearcoat composition to produce a hardened clear varnish on a substrate and a corresponding clearcoat produced on a substrate.