Patent ID: 6149842
Filing Date: 2000-11-21
Classification: B29C,B29D

Abstract:
A process for the manufacture of a tinted ophthalmic molding comprising the steps of:(a) providing a water soluble polymer having crosslinkable groups and having a weight average molecular weight of at least 2000;(b) providing an aqueous pigment dispersion comprising a phthalocyanine pigment and a physiologically acceptable, water soluble, polymeric dispersing agent;(c) mixing the pigment dispersion with the polymer to form a tinted prepolymerization mixture,(d) dispensing the tinted prepolymerization mixture into a mold,(e) applying radiation to the tinted prepolymerization mixture in the mold, thereby crosslinking or polymerizing the polymer and entrapping the pigment within the polymeric network of the resultant ophthalmic molding, and(f) opening the mold so that the ophthalmic molding can be removed from the mold.