Curable fluoropolyether base rubber compositions
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMakoto Sato, Takashi Matsuda, Shinichi Sato, Masatoshi Arai
Life of this patent
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Abstract
A curable fluoropolyether base rubber composition contains (A) 100 parts by weight of a linear fluoropolyether compound having at least two alkenyl groups in a molecule and a perfluoroalkyl ether structure in its backbone, (B) 10-40 parts by weight of a silica filler having a specific surface area of at least 50 m2/g, (C) 5-35 parts by weight of diatomaceous earth, (D) an organosilicon compound having at least two Si—H groups, and (E) a hydrosilylation catalyst. The inclusion of diatomaceous earth is effective for preventing the composition from outgassing and from changing its curing behavior with time.
Claims20
A curable fluoropolyether base rubber composition comprising
- (A) 100 parts by weight of a linear fluoropolyether compound having at least two alkenyl groups in a molecule and a perfluoroalkyl ether structure in its backbone,
- (B) 10 to 40 parts by weight of a silica filler having a specific surface area of at least 50 m2/g,
- (C) 5 to 35 parts by weight of diatomaceous earth,
- (D) an organosilicon compound having at least two hydrogen atoms each attached to a silicon atom in a molecule, and
- (E) a hydrosilylation catalyst, components (D) and (E) being in effective amounts to cure component (A).
Dependencies are inferred from the claim text.