Manufactured method of alkoxy radical-containing silicone resin

Details Manufactured method of alkoxy radical-containing silicone resin Manufactured method of alkoxy radical-containing silicone resin

1993-02-05

1994-04-05

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 34, 525477, C08G 7706

Patent

active

053006100

ABSTRACT:
The invention provides a method for manufacturing an alkoxy radical-containing silicone resin wherein the molecular weight, viscosity, thermal transition point, and alkoxy radical content can be easily controlled. The method of the instant invention comprises combining under anhydrous conditions, (A) an alkoxysilane represented by the formula R.sup.4.sub.a Si(OR.sup.5).sub.4-a or its partial hydrolysis product wherein R.sup.4 is selected consisting of a monovalent hydrocarbon radical and a monovalent halogenated hydrocarbon radical, R.sup.5 is selected from the group consisting of an alkyl radical containing 1 to 6 carbon atoms, and a has a value of 0 to 3; and (B) an organopolysiloxane or a mixture of organopolysiloxanes selected from the group consisting of organopolysiloxanes that are made of siloxane units selected from the group consisting of R.sup.1 SiO3.sub./2 and R.sup.2 R.sup.3 SiO and mixtures thereof wherein R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of monovalent hydrocarbon radicals and monovalent halogenated hydrocarbon radicals; followed by heating the mixture of (A) and (B) in the presence of a basic catalyst to perform a reequilibration reaction for said components (A) and (B).

REFERENCES:
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patent: 3846358 (1974-11-01), Roedel
patent: 4387196 (1983-06-01), Bonnet et al.
patent: 4387196 (1983-06-01), Bonnet et al.
patent: 4388449 (1983-06-01), Bonnet et al.
patent: 4413104 (1983-11-01), Deubzer et al.

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