Patent ID: 7074839

Claim:
A hydrophilic, crosslinkable oligomer composition comprising a) a first component oligomer comprising a plurality of polymerized monomer units having pendent hydrophilic poly(alkylene oxide) groups, and pendent photoinitiator groups; and b) a hydrophilic poly(alkylene oxide) crosslinking agent haying polymerizable, ethylenically unsaturated terminal groups of the formula Zâ€”Q-CH(R 1 )â€”CH 2 â€”Oâ€”(CH(R 1 )â€”CH 2 â€”O) m â€”CH(R 1 )â€”CH 2 -Q-Z, wherein Z is a polymerizable ethylenically unsaturated moiety, R 1 is a H or a C 1 to C 4 alkyl group, and m is from 20 to 500, and Q is a divalent linking group selected from â€”Oâ€”, â€”NR 1 â€”, â€”CO 2 â€” and â€”CONR 1 â€”.