METHOD OF PRODUCING OLIGODIMETHYLSILOXANES Russian patent published in 2014 - IPC C08G77/06 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing oligodimethylsiloxanes via rearrangement of dimethylcyclosiloxanes and/or a hydrolysate of dimethyldichlorosilane in the presence of hexamethylsiloxane and a catalyst - a sulphonated copolymer of styrene and divinyl benzene with content of the latter ranging from 25 wt % to 50 wt %, where the initial step of the process involves activating the catalyst by adding liquid polymethylsiloxane with viscosity of 10-50 cSt to the reaction mixture, wherein activation and production of oligodimethylsiloxanes are carried out in a current of inert gas with specific consumption of 0.2 m³/h per 1 kg catalyst in fluidisation conditions at temperature of 70-90°C.

EFFECT: high efficiency of the method by cutting duration of the induction effect as a result of catalyst activation and improved quality of the obtained oligodimethylsiloxanes by reducing the polydispersity index.

3 cl, 2 dwg, 4 ex