Contact lenses and materials and methods of making same

Abstract From the Canadian patent

An interpenetrating network copolymer method, of producing same, and method of producing optical lens blanks and finished lenses therefrom. The method broadly involves the preparation of first and second mixtures of polymerizable vinyl monomers and interrupting the polymerization of the first mixture at a relative viscosity of from about 1.05 to about 10 by admixing the partially polymerized first mixture with the second mixture to create a casting solution and thereafter when, desired, polymerizing molded casting solution in heat to create a solid lens material.