C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
402/13, 260/445.
C07F 7/08 (2006.01) C07F 7/18 (2006.01) C08G 77/08 (2006.01)
Patent
CA 1127656
ABSTRACT OF THE DISCLOSURE An improved process is provided for increasing the molecular weight of silicon compounds containing predominately Si-bonded alkoxy groups. The process involves hydrolyzing the silicon compounds at an elevated temperature in the presence of hydrates of at least one salt of an ammonium hydroxide and/ or metal of the first to the third principal group of the Periodic System of elements according to Mendeleeff and in an amount of at least 8 grams of hy- drated salt per mol of alkoxy group, while distilling off the alcohol as it is evolved, to form a product which does not solidify when cooled to at least room temperature. By this process long heating times are avoided, the hy- drolysis of the alkoxy group is controlled, the molecular weight of the poly- siloxane is regulated, the catalyst need not be neutralized, and the alcohol split off during hydrolysis can be recovered more easily. These organopolysiloxanes may be used in the preparation of heat resistant and weather resistant varnishes, as binding agents for mica and glass fibrics, as soaking and impregnation resins, and as components of separative coatings.
319544
Deubzer Bernward
Egerter Norbert
Marcus & Associates
Wacker-Chemie Gmbh
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