Patent ID: 10221273

Abstract:
A contact lens is provided as hydrate of a copolymer of at least three components including (I) both terminal-polymerizable silicone oligomer exhibiting viscosity of at least 200 mPa·s at room temperature, (II) a hydrophilic monomer component having ethylenically unsaturated group, and (III) a hydrophobic monomer component having molecular weight of at most 700, wherein the lens exhibits an elastic-modulus ratio determined as ratio of a rupture elastic modulus to an initial elastic modulus in range of 0.8-1.2. The contact lens is transparent and by combination of high oxygen permeability and balance between softness and mechanical properties. The lens is produced through a process including steps of stirring material-liquid including at least three components of the above-mentioned (I), (II) and (III) under stirring power of 5-10000 W/m3 per unit volume of the material-liquid for at least 10 minutes, and injecting stirred material-liquid into a lens mold to polymerize material-liquid.