Process for producing a low viscosity silicone resin

Details Process for producing a low viscosity silicone resin Process for producing a low viscosity silicone resin

1975-11-10

1977-05-31

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 28R, 260 37SB, 260 465G, C08G 7704

Patent

active

040268683

ABSTRACT:
A process for producing a low viscosity silicone resin which comprises hydrolyzing halosilanes in a heterogeneous hydrolysis mixture of water, acetone and a water-immiscible solvent where the critical aspects of the process are the addition of the chlorosilanes to the hydrolysis medium by first mixing them with a portion of the acetone and adding them to the hydrolysis mixture over a period of at least 40 minutes and maintaining the temperature of said hydrolysis medium such that it does not exceed 45.degree. C. The silicone resins produced by this process are useful in producing molding compositions having a low coefficient of thermal expansion.

REFERENCES:
patent: 3489782 (1970-01-01), Pruvost et al.
patent: 3666830 (1972-05-01), Alekna
patent: 3792012 (1974-02-01), Zdaniewski

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