A photoactive resin for improving cure properties of radiation curable compositions and inks, said resin comprising: an aromatic ketone monomer including a biphenyl moiety; and a chain ending group selected from hydrogen, a methylol group and mixtures thereof, the resin having the formula: wherein, R1 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R2 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R3 is selected from an substituted, bridged, aromatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, unbridged, aromatic radical having 1 to 20 carbon atoms, a substituted, bridged, aliphatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aliphatic radical having 1 to 20 carbon atoms, and an unsubstituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, Y is said chain ending group selected from hydrogen, a methylol group and mixtures thereof, m is an integer from 0-50, n is an integer from 1-50, and o is an integer from 0-2. an aromatic ketone monomer including a biphenyl moiety; and a chain ending group selected from hydrogen, a methylol group and mixtures thereof, the resin having the formula: wherein, R1 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R2 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R3 is selected from an substituted, bridged, aromatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, unbridged, aromatic radical having 1 to 20 carbon atoms, a substituted, bridged, aliphatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aliphatic radical having 1 to 20 carbon atoms, and an unsubstituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, Y is said chain ending group selected from hydrogen, a methylol group and mixtures thereof, m is an integer from 0-50, n is an integer from 1-50, and o is an integer from 0-2. R1 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R2 is selected from hydrogen, a branched alkyl radical having 1 to 12 carbon atoms, an unbranched alkyl radical having 1 to 12 carbon atoms, a branched aromatic radical having 1 to 12 carbon atoms, and an unbranched aromatic radical having 1 to 12 carbon atoms, R3 is selected from an substituted, bridged, aromatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aromatic radical having 1 to 20 carbon atoms, an unsubstituted, unbridged, aromatic radical having 1 to 20 carbon atoms, a substituted, bridged, aliphatic radical having 1 to 20 carbon atoms, a substituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, an unsubstituted, bridged, aliphatic radical having 1 to 20 carbon atoms, and an unsubstituted, unbridged, aliphatic radical having 1 to 20 carbon atoms, Y is said chain ending group selected from hydrogen, a methylol group and mixtures thereof, m is an integer from 0-50, n is an integer from 1-50, and o is an integer from 0-2.