Dow Global Technolgoies LLC

Dow Silicones Corporation

Jarred Cramton

Mark F Sonnenschein

Kai Su

Mark David Fisher

Benjamin L Wendt

Jody J Henning

Adam H Broderick

Douglas A Brune

Mark D Fisher

A composition for forming a foamed silicone elastomer is disclosed. The composition comprises: A) an organopolysiloxane having at least two silicon-bonded ethylenically unsaturated groups per molecule; B) an organohydrogensiloxane having at least two silicon-bonded hydrogen atoms per molecule; C) a hydrosilylation catalyst; D) a chemical blowing agent; and E) a physical blowing agent. The hydrosilylation catalyst C) is present in a catalytically effective amount. The chemical blowing agent D) has at least one hydroxyl (OH) group, and is present in an amount to provide a OH content &#x3e;0 and &#x3c;500 parts per million (ppm). The physical blowing agent E) undergoes a phase change from a liquid to a gaseous state during exposure to atmospheric pressure and a temperature &#x2265;0&#xb0; C. The blowing agents D) and E) are different from one another. A foamed silicone elastomer, and methods of forming the composition and foamed silicone elastomer are also disclosed.

Composition, foamed silicone elastomer formed therefrom, and methods of formation

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Midland, MI, United States of America

Jarred Cramton