Process to prepare polyorganosiloxanes in a thin-film evaporator

Details Process to prepare polyorganosiloxanes in a thin-film evaporator Process to prepare polyorganosiloxanes in a thin-film evaporator

1995-06-07

1996-10-01

Wilson, D. R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 21, C08G 7706, C08G 7708

Patent

active

055612091

ABSTRACT:
A process for preparing polyorganosiloxanes having a viscosity ranging from 0.2 to 10,000 Pas (at 20.degree. C.) by reaction of low molecular polyorganosiloxanols with each other or with oligomeric siloxanes in the presence of a catalyst system in a thin layer evaporator is disclosed. These products are silicone oils and silicone rubber polymers or starting materials for further modifications. The process is carried out at temperatures ranging from 80.degree. to 200.degree. C. and pressures ranging from 1 to 1000 mbar (abs.). The advantages include prevention of recycling through milder reaction conditions and reduction in the accumulation of intermediate fractions during product conversions.

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R. H. Perry et. al, "Perry's Chemical Engineer's Handbook", 6th ed. McGraw Hill Book Co, pp. 5-41 (1984).
Chemical Abstracts, vol. 83, No. 10, AN-80062y, A. G. Trufanov, et al, "Use of a Rotor Thin-Film Evaporator for Separating Poly(Ethylsiloxane) Liquids".
Database WPI, Derwent Publications Ltd., AN-75-18633, JP-B-50 004 399, Feb. 18, 1975.
Chemical Abstracts, vol. 114, No. 1, AN-6816q, JP-A-2 200 689, Okada, et al., Aug. 8, 1990.

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