Preparation of branched oligomethyl phenyl siloxanes with metacrylethoxyl groups in the lateral chain

Preparation of branched oligomethyl(phenyl)siloxanes with metacrylethoxyl groups in the lateral chain 

01igomethyl(phenyl)metacrylethoxysiloxane (MAS) is a mixture of oligomer homologues in a solution of toluene and butanol with the following common composition  

MAS is synthesised by the hydrolytic cocondensation of metacrylated triacetoxymethyl- and triacetoxyphenylsilanes  

MAS production comprises two main stages 1) the hydrolytic cocondensation of the metacrylation products of the acetoxysilane mixture and the flushing of the products from acetic acid with an impurity (-0.5%) of glycolmethacrylate 2) the partial distillation of the solvents from the product of hydrolytic cocondensation and the filtering of the finished product. 

After the product in reactor 1 has been flushed, the agitator is switched on, condenser 4 is switched into the direct mode, a vacuum is created in the system (the residual pressure is 550-480 GPa), the jacket of the apparatus is filled with vapour and the solvents (butanol and toluene mixture) are partially distilled up to 65 °C in vapour into receptacle 7. The vapour is switched off, the jacket of the reactor is filled with water, the reactive mixture is cooled to 25-30 °C, the agitator is stopped and the vacuum is discharged. From reactor 1 the reaction product is sent to ultracentrifuge 8. From there the finished MAS is sent into container 9. 

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