Hydratable siloxane comprising porous polymers

A hydratable porous polymer comprising:

• a polymer matrix and internal voids within the polymer matrix, wherein the internal voids within the polymer matrix is capable of holding an equilibrium water content of greater than 5% by weight, wherein the polymer matrix is a polymerization product of a polyorganosiloxane macromonomer and optionally one or more comonomers having one or more ethylenically unsaturated groups selected from the group consisting of acrylolyl, methacryloyl, styryl, acrylamido, acrylamidoalkyl, urethanemethacrylate, and substituted derivatives thereof, wherein the polyorganosiloxane macromonomer is free of perfluoropolyether blocks and has formula I
• Q—[M—L]c—M—Q (I)
• wherein c is in the range of from 0 to 5,
• M may be the same or different from the other M in formula I and is a difunctional block of molecular weight in the range of from 100 to 8000 and wherein at least one M comprises a residue from a difunctional polymer or copolymer comprising siloxane repeat units of formula II
• where R1 and R2 may be the same or different and are selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkenyl, alkynyl, aryl, haloalkyl, haloalkenyl, haloalkynyl, haloaryl, heterocyclyl, and haloheterocyclyl,
• L may be the same or different from the other L in formula I and is a difunctional linking group,
• and each Q and is a polymerizable group.