Agents curable by ultraviolet radiation

Claim 1

A composition which is curable by ultraviolet radiation and is based on a binder formulation of: 1) from 99.0 to 20% by weight of a copolymer, 2) from 1.0 to 80% by weight of monoolefinically unsaturated compounds, and 3) from 0 to 20% by weight of polyolefinically unsaturated compounds, wherein the composition contains a copolymer (1) which is obtainable by subjecting to a free-radical-initiated polymerization a mixture of: (A) from 20 to 99.9% by weight of olefinically unsaturated monomers, (B) from 0 to 10% by weight of a copolymerizable olefinically unsaturated photoinitiator, (C) from 0.1 to 10% by weight of a polymerizationregulating initiator selected from the group consisting of 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1-one, isopropyl thioxanthone, 4-isopropylbenzophenone, ethyl2,4,6-trimethylbenzo-ylphenylphosphinate, isopropyl benzoin ether, 2,2-diethoxyacetophenone and ethyl benzoin ether; which initiator reduces the degree of polymerization of the copolymer (1) during the free-radical-initiated polymerization, the sum of (B) and (C) being not less than 0.1% by weight and the stated percentages being based on the sum of the weights of (A)+(B)+(C).