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:
Dec. 30, 1980
Filed:
May. 14, 1979
Peter August, Seevetal, DE;
Willi Primas, Simbach, DE;
Wacker-Chemie GmbH, Munich, DE;
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.