Polyacrylate Crosspolymer-15 is a complex polymer formed by the reaction of Glycol Dimethacrylate with an oligomer prepared by reacting a polypropylene glycol having an average of 4 mols of propylene glycol with Toluene Diisocyanate and then encapping with HEMA. The resulting acrylate polymer is crosslinked with N,N'-Methylenebisacrylamide.