Dow Corning Corporation

Dow Silicones Corporation

Kristen E Steinbrecher

James Steven Tonge

Afrooz A Zarisfi

Kimmai Thi Nguyen

Lauren Marie Tonge

Glenn Gordon

Kent R Larson

Kenneth Edward Zimmerman

Zhi Li

Bartley Dean Maxon

Yin Tang

Jing Jiang

Fang Zhang

Paul W Pretzer

Lisa M Vanommeren

Evan Waddell

Kent Larson

A composition comprises (A) a silicone elastomer. The (A) silicone elastomer comprises the reaction product of: (a) an organohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule; (b) a crosslinking agent having an average of at least two ethylenically unsaturated groups per molecule; and (c) a hydrosilylation catalyst. The reaction product is formed in the in the presence of (d) a silicone polyether polymer; and (e) particles. The composition further comprises (B) a carrier fluid. The (e) particles are dispersed in the (A) silicone elastomer in the composition. A method of preparing the composition is also disclosed.

Composition and method of preparation

A hydrosilylation process is used to prepare a clustered functional polyorganosiloxane. The clustered functional polyorganosiloxane comprises a reaction product of a reaction of a) a polyorganosiloxane having an average, per molecule, of at least 2 aliphatically unsaturated organic groups; b) a polyorganohydrogensiloxane having an average of 4 to 15 silicon atoms per molecule; and c) a reactive species having, per molecule at least 1 aliphatically unsaturated organic group and 1 or more radical curable groups selected from an acrylate group and a methacrylate group; in the presence of d) a hydrosilylation catalyst, and e) an isomer reducing agent. The weight percent of silicon bonded hydrogen atoms in component b) divided by the weight percent of aliphatically unsaturated organic groups in component a) (the SiH/Viratio) ranges from 4/1 to 20/1. The resulting clustered functional polyorganosiloxane is useful in a curable silicone composition for electronics applications.

Clustered functional polyorganosiloxanes, processes for forming same and methods for their use

An alkoxy-functional organopolysiloxane resin and polymer is disclosed that comprises the reaction product of a reaction of (i) an alkenyl-functional siloxane resin comprising RSiOunits and SiOunits; (ii) an alkoxysilane-functional organosiloxane compound having at least one silicon-bonded hydrogen atom at a molecular terminal; (iii) an endcapper according to the formula to the formula RSi&#x2014;(RSiO)&#x2014;SiRH or RSi&#x2014;(RSiO)&#x2014;(HRSiO)&#x2014;SiR, or combinations thereof; and (iv) a polyorganosiloxane having an average, per molecule, of at least 2 aliphatically unsaturated organic groups in the presence of a (v) hydrosilylation catalyst. In this alkoxy-functional organopolysiloxane resin and polymer, each Ris independently a hydrocarbon radical and the subscripts s and t independently have values ranging from 0 to 10.

Alkoxy-functional organopolysiloxane resin and polymer and related methods for forming same

A stable thermal radical curable silicone composition is provided that comprises (I) a clustered functional polyorganopolysiloxane having one or more radical curable groups selected from an acrylate group and a methacrylate group; (II) a reactive resin and polymer; (III) a radical initiator; (IV) a moisture cure initiator; and (V) a crosslinker. The reactive resin and polymer includes (a) an organopolysiloxane polymer and (b) an alkoxy-functional organopolysiloxane resin. The alkoxy-functional organopolysiloxane resin comprises the reaction product of a reaction of (i) an alkenyl-functional siloxane resin, (ii) an alkoxysilane-functional organosiloxane, and (iii) an endcapper in the presence of (iv) hydrosilylation catalyst. The stable thermal radical curable silicone composition can be utilized for electronics applications.

Stable thermal radical curable silicone adhesive compositions

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Midland, MI, United States of America

Kristen E Steinbrecher