Method for preparing solid polyorganosiloxane

Details Method for preparing solid polyorganosiloxane Method for preparing solid polyorganosiloxane

2011-03-29

2011-03-29

Price, Elvis O (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C556S453000, C528S012000

Reexamination Certificate

active

07915440

ABSTRACT:
A method for preparing a polyorganosiloxane which is sold at 25° C. and has R13SiO0.5units wherein R1is a hydrocarbon group having 1 to 10 carbon atoms and SiO2units, said method comprising the steps of:[1] subjecting at least one selected from an organosilane and an organodisiloxane, and at least one selected from a tetralkoxysilane and a partial condensate of hydrolysates of the tetralkoxysilane to hydrolysis reaction and condensation reaction in the presence of an acidic catalyst;[2] adding a liquid aliphatic hydrocarbon; and subsequently[3] separating a liquid aliphatic hydrocarbon phase and an aqueous phase and then removing said aqueous phase;provided that the step [2] may be performed before, during, or after the step [1].

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