Coating material with high solids content, esp. for painting cars

摘要

Coating material with a high solids content (I), contg. (A) OH gp.-contg. copolymer(s) with an OH no. of 100-160 mg KOH/g., an acid no. of 10-50, a mol. wt. (Mn) of 1000-3000 and a Tg of 30-80 deg C, derived from (al) 8-12 wt.% vinyl ester(s) of alpha , alpha -dialkyl-substd., branched, satd. aliphatic acid(s), (a2) 32-42 wt.% hydroxyalkyl (meth)acrylate(s), (a3) 25-40 wt.% alkyl (meth)acrylate(s), (a4) 12-24 wt.% unsubstituted or substd. cycloalkyl (meth)acrylate(s) and (a5) 2-4 wt.% (meth)acrylic acid; (B) polyisocyanate(s) in the amt. required to provide 0.5-2 NCO gps. per OH gp. in (A); and (C) solvent(s) and opt. pigments, fillers and/or normal paint additives. Also claimed is a multilayer painting process involving the application of at least two topcoats, in which material (I) is used for the prodn. of a filler coat and/or a pigmented or transparent topcoat.