Addition-crosslinkable silicone compositions with low coefficients of friction
AssigneeWacker Chemie AG
InventorsChristof Woerner, Willi Primas
Life of this patent
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Abstract
Addition-crosslinkable silicone compositions contain (A) 100 parts by weight of polydiorganosiloxane(s) which has alkenyl groups and whose viscosity is from 5000 to 50,000,000 mPas at 25° C., having at least 2 alkenyl groups per molecule, and at least 0.15 mol % of alkenylsiloxane units, based on all siloxane units, (B) from 1 to 50 parts by weight of polydiorganosiloxane(s) whose viscosity is at least 5,000,000 mPas at 25° C., and having no alkenyl groups, (C) SiH-functional crosslinking agent(s), (D) hydrosilylation catalyst(s), and (E) from 3 to 90 parts by weight of filler(s) whose BET specific surface area is at least 50 m2/g. Vulcanizates of the addition-crosslinkable silicone compositions have low coefficients of friction.
Claims6
An addition-crosslinkable silicone composition, comprising
- (A) 100 parts by weight of polydiorganosiloxane(s) having at least 2 alkenyl groups per molecule, whose viscosity is from 2,000,000 to 50,000,000 mPas at 25° C., and having at least 0.15 mol% of alkenylsiloxane units, based on all of the siloxane units,
- (B) from 1 to 50 parts by weight of polydiorganosiloxane(s) having no alkenyl groups and whose viscosity is at least 5,000,000 mPas at 25° C.,
- (C) at least one SiH-functional crosslinking agent,
- (D) at least one hydrosilylation catalyst, and
- (E) from 3 to 90 parts by weight of at least one filler whose BET specific surface area is at least 50 m2/g.
Dependencies are inferred from the claim text.