Urethane acrylates based on 2,4,8,10-tetraoxospiro[5.5]-undecane-3,9-dialkanols

A urethane acrylate being a reaction product of a raw material composition comprising at least (A) a diol component, (B) a component having acrylic unsaturation and (C) an isocyanate component characterised in, that said component (A) comprises at least one alkoxylated 2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-dialkanol of formula

• wherein each substituent R individually is a linear or branched C1-C8 alkyl group and m, n, p and q individually are integers each being at least 1, that said acid component (B) comprises at least one hydroxyalkyl acrylate, hydroxyalkyl methacrylate and/or hydroxyalkyl methylacrylate, and/or comprises acrylic acid, methacrylic acid and/or a methylacrylic acid and/or a corresponding alkyl ester of a said acrylic acid, and that said component (C) comprises at least one di or polyisocyanate and/or a derivative thereof.