Photo-crosslinkable silicones comprising oxyalkylene styrene groups and their use

Claim 1

A silicone co-polymer of molecular weight 5,000 to 100,000 having the general formula (I) R.sub.b (R.sub.a).sub.2 SiO(V).sub.v --(W).sub.w --(Y).sub.y --(Z).sub.z --Si(R.sub.a).sub.2 R.sub.b wherein V is a diorganosiloxane unit having monovalent hydrocarbon substituents having 1 to 8 carbon atoms, R a is selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, pentyl, hexyl, octyl and phenyl provided no more than one phenyl radical is bonded to any silicon atom, R b is selected from the group consisting of R a and an oxyalkylene styrene group connected to a silicon atom of a siloxane unit through a group selected from an alkylene unit, an alkylene unit having at least one oxygen atom in the chain and an alkylene unit having at least one sulphur atom in the chain, W is a siloxane unit having an oxyalkylene styrene group connected to the silicon atom of the siloxane unit through a group selected from an alkylene unit, an alkylene unit having at least one oxygen atom in the chain and an alkylene unit having at least one sulphur atom in the chain, Y is a diorganosiloxy unit wherein the organo radicals are selected from the group consisting of hydrocarbon having 1 to 12 carbon atoms and fluorinated hydrocarbon groups having 1 to 12 carbon atoms, Z represents a silfluoroalkylene-siloxy unit, v, y and z have identical or different values but they are not simultaneously zero; w is always non-zero and v+y+z/w is from 1 to 100.