Patent ID: 6150476
Filing Date: 2000-11-21
Classification: C08G,C09D

Abstract:
A mixture of ethylenically unsaturated polyurethanes comprisingI) 5 to 95% by weight, based on the weight of components I) and II), of an ethylenically unsaturated polyurethane which is substantially free from isocyanate groups and hasa) 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 andc) a total content of ethylenically unsaturated groups (calculated as C.dbd.C, MW 24) of 1 to 20% by weight,II) 5 to 95% by weight, based on the weight of components I) and II), of an ethylenically unsaturated polyurethane which is substantially free from isocyanate groups and is based on the reaction product ofa) a cyclic diisocyanate having (cyclo)aliphatically bound isocyanate groups withb) a compound containing alcoholic hydroxyl groups and prepared at a COOH/OH equivalent ratio of 0.6 to 0.95 fromi) (meth)acrylic acid andii) a tri- or tetrahydric ether alcohol having a molecular weight of 180 to 1000, which contains 2 to 10 ethylene oxide units, --CH.sub.2 --CH.sub.2 --O--, as part of one or more ether structures and which contains 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--, andIII) up to 200%, based on the total weight of the coating composition, of a copolymerizable monomer that does not contain urethane groups.