| abstract |
Provided is a cross-linked polymer composition which can be in a transparent polymeric gel form having an equilibrium water content of at least 60 wt.% for use in soft contact lenses. The cross-linked polymer composition is prepared by polymerizing, using a bulk polymerization procedure, a monomer mixture comprising an alkyl methacrylate and an N-vinyllactam in the presence of a cross-linking agent comprising at least one compound selected from vinyl acrylate, vinyl methacrylate, triallyl isocyanurate and vinyl carboxylates expressed by the formula: R-COOCH=CH2)n where R is a hydrocarbon radical having 1 to 10 carbon atoms and n is an integer of 2, 3 or 4. |