Patent ID: 8497357

Claim:
A hydrogel comprising, a co-polymerization product of a PEG multiacrylate and a heterobifunctional PEG conjugate wherein, (i) the multiacrylate has the formula of CH 2 ═CHCO 2 -PEG-O 2 CCH═CH 2 , wherein PEG is polyethylene glycol, and (ii) the conjugate has the formula of (CH 2 ═CZ—CO 2 -PEG-W-L) x -T, wherein Z is an alkyl group or hydrogen atom, W is a hydrolytically unstable linkage comprising a hydrolysable covalent bond, L is a covalent linkage, PEG is a polyethylene glycol, T is a protein, and x is number from 1 to 10.