Coating compositions containing a mixture of ethylenically unsaturated polyurethanes

Abstract

The present invention relates to a mixture of ethylenically unsaturated polyurethanes containing I) 5 to 95% by weight, based on the weight of components I) and II), of ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and have a) a content of .beta.,.gamma.-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophanate groups of 0.5 to 10% by weight, b) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 20% by weight and c) a total content of ethylenically unsaturated groups of (calculated as C.dbd.C, MW 24) of 1 to 15% by weight, II) 5 to 95% by weight, based on the weight of components I) and II), of ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and are based on the reaction products of a) cyclic diisocyanates having (cyclo)aliphatically bound isocyanate groups with b)compounds containing alcoholic hydroxyl groups and prepared at a COOH/OH equivalent ratio of 0.6 to 0.95 from i) (meth)acrylic acid and ii) tri- or tetrahydric ether alcohols having a molecular weight of 180 to 1000, which contain 2 to 10 ethylene oxide units, --CH.sub.2 --CH.sub.2 --O--, as part of one or more ether structures and which contain up to 20 mole %, based on the total moles of alkylene oxide units, of propylene oxide units, --CH.sub.2 --CH(CH.sub.3)--O--, and III) up to 200%, based on the total weight of the coating composition, of copolymerizable monomers that do not contain urethane groups. The present invention also relates one-component coating compositions containing these mixtures and to substrates coated with these coating compositions.

Dependencies are inferred from the claim text.