Radiation curable compositions

A non-aqueous composition, which contains no ethylenically unsaturated monomer, and which comprises

• A) from about 1 to about 99% by weight of an unsaturated (meth)acrylate polymer or oligomer selected from the group consisting of:
• a) an unsaturated urethane (meth)acrylate polymer or oligomer, which has an isocyanate group content of 1% by weight or less and is prepared by reacting:
• ai) one or more organic polyisocyanates, and
• aii) an unsaturated (meth)acrylate selected from the group consisting of
• 1) from 0 to 100% by weight of an unsaturated polyether (meth)acrylate polyol having an OH number of from about 30 to about 500, and prepared by reacting an aliphatic polyether di- or polyol with acrylic and/or methacrylic acid, and
• 2) from 0 to about 100% by weight of a mono-, di-, tri- or poly-hydroxyl-C1-C10-alkyl or C6-C10-aryl (meth)acrylate, wherein the percents by weight of components aii)1) and aii)2) are based on the total weight of components aii)1) and aii)2 and total 100%,
• at an isocyanate to hydroxyl equivalent ratio of from about 0.95:1 to about 1:0.95,
• b) an unsaturated polyether (meth)acrylate polyol having an OH number of from about 30 to about 100, and prepared by reacting a polyether di- or polyol with acrylic and/or methacrylic acid, and
• c) mixtures thereof,
• B) from about 1 to about 99% by weight of an unsaturated epoxy (meth)acrylate which is substantially free from epoxide groups and is prepared by reacting
• bi) one or more organic compounds containing at least one epoxide group and having a number average molecular weight of from about 130 to about 1000,
• bii) from 1.3 to 3.0 carboxy equivalents of organic dicarboxylic acid or anhydride having a number average molecular weight of from about 98 to about 166,
• biii) 1 hydroxy equivalent of an hydroxyl group containing reaction product, prepared at a carboxy to hydroxyl equivalent ratio of from 0.6:1 to 0.95:1 of
• 1) (meth)acrylic acid and
• 2) tri- or tetrahydroxy ether alcohols having a number average molecular weight of from about 180 to about 1000 and containing at least two ethylene and/or propylene oxide units as part of an ether structure,
• with the ratio of reactive equivalents of components bii) through biii) to epoxide equivalents of component bi) being at least about 1:1,
• C) from about 0.1 to about 10% by weight of one or more photoinitiators, wherein the % by weight of component C) is based on the combined weight of components A) and B) and wherein the percentages of components A) and B) total 100%, and
• D) from 0 to about 90% by weight of solvent or a mixture of solvents, wherein the % by weight of component D) is based on the total combined amount of components A) and B).