Polysiloxanes with (meth) acrylate ester groups linked through sic groups and their use as radiation-curable coating materials forflat carriers

Abstract From the Canadian patent

Polysiloxanes with (meth)acrylate ester groups linked over SiC groups are disclosed which are obtainable by the reaction of epoxyfunctional polysiloxanes of the general formula in which, R1 are the same or different low molecular weight alkyl groups with 1 to 4 carbon atoms or phenyl groups, R2 is the same as R1 or represents the R3 group 70 to 100% of the R3 groups being epoxy functional groups and 30 to 0% being alkyl groups with 2 to 20 carbon atoms or hydrogen with the proviso that the average molecule contains at least 1.5 epoxy groups, a has a value of 1 to 1,000 and b a value of 0 to 10. with such amounts of an acid mixture comprising, (a) 10 to 90 mole percent of (meth)acrylic …