Method of manufacturing solvent-soluble polyorganosilsesquioxane

Details Method of manufacturing solvent-soluble polyorganosilsesquioxane Method of manufacturing solvent-soluble polyorganosilsesquioxane

1990-06-18

1992-02-04

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 29, 556462, 556470, C08G 7706

Patent

active

050861450

ABSTRACT:
Disclosed is a method of manufacturing solvent-soluble polyorganosilsesquioxanes of the formula; ##STR1## wherein each R is a substituted or unsubstituted alkyl, alkenyl or halogen-substituted alkyl group of 1-5 carbon atoms, or substituted or unsubstituted phenyl of 6-10 carbon atoms, and n is 2-10,000; which comprises reacting an organotriacetoxysilane with a stoichiometric quantity of alcohol and/or water in an organic solvent to obtain a diacetoxymonoalkoxysilane, which is condensation polymerized in the presence of sodium hydrogencarbonate to obtain a prepolymer, which prepolymer is then condensation polymerized by heat in the presence of a catalyst selected from alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal fluorides, alkaline earth metal fluorides and triethylamine.

REFERENCES:
patent: 4399266 (1983-08-01), Matsumura
patent: 4467081 (1984-08-01), Chang et al.
patent: 4528390 (1985-07-01), Kimura

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