The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 1994
Filed:
Feb. 05, 1993
Junji Nakanishi, Chiba, JP;
Toshio Saruyama, Chiba, JP;
Dow Corning Toray Silicone Co., Ltd., Tokyo, JP;
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).