Patent ID: 8227086

Claim:
A polymer precursor represented by Formula 1a in which Y represents a direct bond or an oxy group; R 1 represents an optionally substituted organo group with at least one double bond wherein the double bond is optionally an activated unsaturated moiety such as a (meth) acrylate group; R 2 and R 3 within each optional repeat unit, are independently chosen from one or more optionally substituted hydrocarbo, hydrocarbo(oxy), hydrosilico and/or hydrosilico(oxy) group(s); R 4 is an optionally substituted organo group having at least one double bond as defined for R 1 above; n is from about 0 to about 2000; with the proviso that the polymer precursor(s) are other than those composed of a polysiloxane main chain and at least one block of polymerised unsaturated monomers obtained by reacting at least one polysiloxane containing pre-polymer containing at least one transferable group with ethylenically unsaturated monomers in a controlled free radical additional polymerisation.