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, 2016
Filed:
Oct. 27, 2014
Momentive Performance Materials Japan Llc, Tokyo, JP;
Masanori Takanashi, Tokyo, JP;
MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC, Tokyo, JP;
Abstract
A method of preparing a curable polyorganosiloxane composition including kneading a uniform mixture of an alkenyl group-containing polyorganosiloxane, a polyorganohydrogensiloxane, and a platinum group metal compound, and defoaming the kneaded mixture under reduced pressure, the alkenyl group-containing polyorganosiloxane includes a linear polyorganosiloxane of the formula (I): R is Ror R, and at least two Rs are R; Ris C-Calkenyl; Ris C-Calkyl; and n is a value that yields a viscosity at 23° C. of 10 to 10,000 cPs, a branched polyorganosiloxane containing SiOand R'SiOunits, optionally a R′SiO and/or a R′SiO, R′ represents a monovalent aliphatic or alicyclic, and at least three R′ groups per molecule are alkenyls, the alkenyl group-containing polyorganosiloxane having a weight ratio of the branched to linear polyorganosiloxane of 1 to 5; and a number of hydrogens bonded to a silicon atom of the polyorganohydrogensiloxane exceeds 2.