Patent ID: 8101789
Filing Date: 2012-01-24
Classification: C07F

Abstract:
1. A process for the production of polymerizable silicones of the formula comprising: (a) providing a mixture of disiloxane (1) of the formula (b) metering in and reacting at a temperature of from 0° to 60° C. a substituted alkoxysilane (4) of the formula (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 R R 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.