METHOD OF PRODUCING POLYORGANOSILOXANES BASED ON ORGANOALKOXYSILANES Russian patent published in 2011 - IPC C08G77/06 C08G77/38 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing methylphenylsiloxane resins through acidolysis of corresponding alkoxysilanes with acetic acid in the presence of an acid catalyst at high temperature using an activation step and batchwise neutralisation of the obtained polyorganosiloxanes. Disclosed also is a method of producing methylphenylsiloxane resins modified with organic resins selected from polyethers and epoxy resins, involving modification at the solvent distillation step.

EFFECT: disclosed method enables to obtain a wide range of polyorganosiloxanes with different radicals along with silicon, fewer process steps, shorter duration of the process, lower amount of washing water, and the obtained polyorganosiloxanes are characterised by improved heat resistance, melting point and rheological properties.

3 cl, 6 tbl, 20 ex