C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 83/06 (2006.01) C08G 77/04 (2006.01) C08L 83/04 (2006.01) C08L 83/07 (2006.01)
Patent
CA 2055303
CURABLE RANDOM DIMETHYLSILOXANE/DIPHENYLSILOXANE COPOLYMER COMPOSITIONS ABSTRACT The combination of 1) a random organosiloxane copolymer wherein from 20 to 50 mol percent of the repeating units are diphenylsiloxane, from 0 to 20 mol percent contain a silicon-bonded lower alkenyl radical and the remaining units are dimethylsiloxane, and 2) as little as 10 weight percent, based on the copolymer, of a finely divided reinforcing filler can be cured using organic peroxides or other means to yield elastomeric materials that not only exhibit unexpectedly high tensile strength and other desirable physical properties under ambient conditions, but retain their elastomeric properties during long term exposure to temperatures above 300°C. The reinforcing filler is preferably a fume form of silica, alumina or titania.
Lee Michael K. J.
Saam John C.
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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