Patent ID: 7671156

Claim:
A silicone hydrogel material, which is obtained by polymerizing a polymerizable fluid composition comprising at least one siloxane-containing macromer with ethylenically unsaturated group(s) and from about 0.05% to about 5% by weight of a chain transfer agent, wherein the chain transfer agent is incorporated in the polymerizable fluid composition in an amount sufficient to provide a reduced elastic modulus to a resultant silicone hydrogel material while increasing or minimally reducing the resultant silicone hydrogel's oxygen permeability, and which has an oxygen permeability of at least about 40 barrers, an ionoflux diffusion coefficient of great than about 1.5×10 −6 mm 2 /min, an elastic modulus of about 1.2 MPa or less, and a water content of at least about 15% by weight when fully hydrated, wherein the chain transfer agent is a mercaptan, alkane-thiols, an aryithiols, a disulfide, carbon tetrabromide, carbon tetrachloride, chloroform, an amine, or mixtures thereof.