Patent ID: 8101789

Claim:
A process for the production of polymerizable silicones of the formula P—Y-Sp-Si(R 2 ) n (OSiR 1 3 ) (3-n) (I) comprising: (a) providing a mixture of disiloxane (1) of the formula (R 1 ) 3 SiOSi(R 1 ) 3 (II), acetic acid (2) and an acid catalyst (3), (b) metering in and reacting at a temperature of from 0° to 60° C. a substituted alkoxysilane (4) of the formula P—Y-Sp-Si(R 2 ) n (OR 3 ) (3-n) (III), (c) adding 0.2-1.0 mol of acetyl chloride (5), based on 1 mol of alkoxysilane (4), (d) following a phase separation, separating an acid phase from a product phase, (e) adding 0.02 to 1.0 mol of hexamethyldisilazane (6), based on 1 mol of alkoxysilane (4) to the product phase, (f) separating a salt formed in the product phase, removing readily volatile constituents from the product phase and distilling the product phase to recover a distilled product, and optionally (g) filtering the distilled product, where R 1 each are identical or different and are hydrogen or optionally substituted monovalent hydrocarbon radicals having 1 to 18 carbon atoms, R 2 each are identical or different and are hydrogen or optionally substituted monovalent hydrocarbon radicals having 1 to 18 carbon atoms, R 3 each are identical or different and are alkyl radicals having 1 to 18 carbon atoms optionally substituted with alkoxy groups, Sp is a single bond or a divalent hydrocarbon radical having 1 to 8 carbon atoms, Y is a single bond or —O—, P is an acryloxy, methacryloxy, vinyl or allyl radical, and n is 0, 1 or 2.