Process for preparing organopolysiloxane resins containing Si-bo

Details Process for preparing organopolysiloxane resins containing Si-bo Process for preparing organopolysiloxane resins containing Si-bo

1979-05-14

1980-12-30

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 15, 528 16, 528 18, 528 32, 528 33, 528 35, 528 37, 528 43, C08G 7706

Patent

active

042424860

ABSTRACT:
A process for preparing organopolysiloxane resins containing Si-bonded vinyl groups which comprises heating to a temperature of from about 85.degree. to 95.degree. C. a mixture containing (A) an organopolysiloxane having at least 0.1 percent by weight of Si-bonded hydroxyl groups and at least 50 mol percent of monoorganosiloxane units (RSiO.sub.3/2), (B) an organosiloxane containing from 2 to 10 silicon atoms per molecule, in which substantially all the silicon valences which are not satisfied by siloxane oxygen atoms, are satisfied by SiC-bonded hydrocarbon radicals, and having on the average at least two such hydrocarbon radicals for each silicon atom and at least one of the siloxanes (A) and/or (B) has an average of at least one SiC-bonded vinyl group, and (C) an acid activated bleaching clay; wherein the water released during the heating step by the condensation of Si-bonded hydroxyl groups is retained in the reactive mixture.

REFERENCES:
patent: 3294737 (1966-12-01), Krantz
patent: 3375223 (1968-03-01), Merrill
patent: 3546156 (1970-12-01), Baronnier et al.

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