Patent ID: 8110610

Claim:
A radiation curable composition comprising a curable compound, a photo-initiator and a co-initiator, wherein the co-initiator is an oligomer or a polymer, the oligomer or polymer having at least two tertiary amines in its repeating unit, the oligomer or polymer being obtained by the poly-condensation of a Michael acceptor having two or oligo number of activated double bonds with an amine according to Formula I having an aliphatic primary amino group and an aliphatic tertiary amino group, wherein L is a divalent linking group positioning the aliphatic primary amino group and the aliphatic tertiary amino group of the amine according to Formula I in a 1-3 to 1-10 position; R1 and R2 independently represent an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkynyl group, or an optionally substituted (hetero)alkaryl group; R1 and R2 may represent the necessary atoms to form a ring; or R1 or R2 may represent the necessary atoms to form a ring with any of the atoms of L; and/or with an amine according to Formula II having two secondary aliphatic amino groups, wherein L′ is a divalent linking group positioning the two aliphatic secondary amino groups of the amine according to Formula II in a 1-3 to 1-10 position; R3 and R4 independently represent an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkynyl group, or an optionally substituted (hetero) alkaryl group; and R4 may represent the necessary atoms to form a ring; or R3 or R4 may represent the necessary atoms to form a ring with any of the atoms of L′.