Process for preparing polydimethylsiloxanes

Details Process for preparing polydimethylsiloxanes Process for preparing polydimethylsiloxanes

1994-11-29

1995-12-19

Bleutge, John C.

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

Synthetic resins

From silicon reactant having at least one...

556452, 556459, 556450, 556466, C08G 7706

Patent

active

054769167

ABSTRACT:
The present invention describes a process wherein dimethyldichlorosilane is reacted, in a first step, with water present in hydrochloric acid to give a crude hydrolysate comprising cyclic and linear, chlorine-containing polydimethylsiloxanes and gaseous hydrogen chloride and, in a second step, the crude hydrolysate is treated with steam to reduce the chlorine content and form hydrochloric acid, with the hydrochloric acid formed in the second step being used in the first step.

REFERENCES:
patent: 2483963 (1949-10-01), Barry et al.
patent: 3903047 (1975-09-01), Ashby
patent: 4032557 (1977-06-01), Spork et al.
patent: 4096160 (1978-06-01), Ashby
patent: 4395563 (1983-07-01), Hayes
patent: 5169970 (1992-12-01), Ohkawa
"Encyclopedia of Polymer Science and Technology" by H. K. Lichtenwalner and M. N. Sprung, vol. 12, 1970, John Wiley & Sons, Inc.
"Chemistry and Technology of Silicones" by W. Noll, Academic Press.

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