Hydratable siloxane comprising porous polymers

The present invention relates to hydratable porous polyorganosiloxane polymers and to processes for producing such hydratable porous polymers. In particular, the present invention relates to a process for polymerising or copolymerising monomers incorporating polyorganosiloxanes to form hydratable porous polyorganosiloxane polymers, and to articles made of hydratable porous polyorganosiloxane polymers including membranes or ophthalmic devices, e.g. contact lenses. An hydratable porous polymer comprising a polymerized polyorganosiloxane macromonomer of formula Iwherein c is in the range of from 0 to 5, preferably in the range of from 0 to 3;M may be the same or different 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 Rand Rmay be the same or different and are selected from the group consisting of hydrogen, optionally substituted alkyl, alkenyl, alkynyl, aryl, haloalkyl, haloalkenyl, haloalkynyl, haloaryl, heterocyclyl, and haloheterocyclyl;L is a difunctional group;and Q may be the same or different and is a polymerizable group.