Patent ID: 6849669

Claim:
Macromolecular hydrophilic photocrosslinker having a general formula (A) n (B) m (C) p producing, upon exposure to light, crosslinked networks, wherein (i) A, B and C are units of substituted ethylene groups in the macromolecular structure; (ii) A, B and C are randomly distributed and the unit C carries a photoactive group, which is an acyl phosphine oxide or aroyl phosphine oxide; (iii) n=0-98 mole %, m=0-98 mole %, n+m=50-98 mole % and p=0.5-50 mole %; and the photoactive group is linked to the ethylene groups of units C by a linking group comprising a group having the structure —O—C(O)—NH—, and wherein the photoactive groups, upon exposure to light of wavelength above 305 nm, generate radicals retained on the macromolecular photocrosslinker and react to provide a crosslinked network structure.