Patent ID: 8431624

Claim:
An actinically crosslinkable prepolymer, comprising: in the branched copolymer chains of the prepolymer, (1) crosslinking polysiloxane polymeric units derived from at least one polysiloxane-containing crosslinker; (2) hydrophilic polymeric units derived from one or more hydrophilic vinylic monomers; (3) dual photo-functional polymeric units, wherein the dual photo-functional polymeric units are derived from a polymerizable compound having an ethylenically unsaturated group, a photoinitiating moiety and a UV-absorbing or latent UV-absorbing moiety; (4) optionally dangling polysiloxane polymeric units derived from one or more monoethylenically functionalized polysiloxane-containing vinylic monomers or macromers, wherein the dangling polysiloxane units is free of ethylenically unsaturated group; and (5) optionally siloxane polymeric units derived from at least one siloxane-containing vinylic monomer, wherein the prepolymer comprises three or more ethylenically unsaturated groups and is soluble in a solvent to form a solution and capable of being actinically crosslinked, in the absence of one or more vinylic monomers or a crosslinking agent, to form a UV absorbing or blocking silicone hydrogel contact lens.