Overtræksmiddel, anvendelse deraf og fremgangsmåde til flerlagslakering

摘要

A coating medium suitable for multilayer coatings, containing A) copolymers containing hydroxyl groups, comprising a1) 8-12% by weight of vinyl esters of alpha, alpha,dialkyl-substituted, branched, aliphatic saturated monocarboxylic acids, a2) 32-42% by weight of hydroxyalkyl esters of (meth)acrylic acid, a2) 25-40% by weight of alkyl esters of (meth)acrylic acid, a4) 12-24% by weight of cycloalkyl esters of (meth)acrylic acid, and a5) 2-4% by weight of (meth)acrylic acid with a hydroxyl number of 100-160 mg KOH/g, an acid number of 10-50 mg KOH/g, a number average molecular weight (Mn) of 1000 to 3000 g/mole and a glass transition temperature (Tg) of 30 DEG -80 DEG C., B) polyisocyanates in a quantitative proportion such that 0.5 to 2 isocyanate groups are allotted to one hydroxyl group of component A), and C) solvents and optionally one or more pigments, extenders and/or customary lacquer additives.