US 12,378,413 B2
Silicone elastomer compositions and elastomeric materials
Shaohui Wang, Shanghai (CN); Yusheng Chen, Shanghai (CN); Rui Wang, Shanghai (CN); Hans Peter Wolf, Schierstein (DE); and Mark D. Fisher, Midland, MI (US)
Assigned to Dow Silicones Corporation, Midland, MI (US)
Appl. No. 17/442,670
Filed by DOW SILICONES CORPORATION, Midland, MI (US)
PCT Filed Mar. 29, 2019, PCT No. PCT/CN2019/080316
§ 371(c)(1), (2) Date Sep. 24, 2021,
PCT Pub. No. WO2020/198905, PCT Pub. Date Oct. 8, 2020.
Prior Publication US 2022/0169856 A1, Jun. 2, 2022
Int. Cl. C08G 77/08 (2006.01); C08G 77/12 (2006.01); C08G 77/20 (2006.01); C08G 77/24 (2006.01); C08K 3/36 (2006.01); C08K 5/14 (2006.01); C08K 9/00 (2006.01); C08L 27/18 (2006.01); C08L 83/04 (2006.01)
CPC C08L 83/04 (2013.01) [C08G 77/08 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01); C08G 77/24 (2013.01); C08K 3/36 (2013.01); C08K 5/14 (2013.01); C08K 9/00 (2013.01); C08L 27/18 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01)] 20 Claims
 
1. A self-lubricating silicone elastomer composition, comprising:
(i) 50 to 75% by weight of one or more polydiorganosiloxane polymer(s) containing from 0.01 to 0.1% by weight of alkenyl content;
(ii) 3 to 15% by weight of a polydiorganosiloxane polymer having ≥0.5% by weight of alkenyl content;
(iii) 10 to 35% by weight of reinforcing filler; and either
(iv) a peroxide catalyst; or
(v) a hydrosilylation catalyst package comprising
(a) a polydiorganosiloxane polymer having at least 2 Si-H groups per molecule; and
(b) a hydrosilylation catalyst; or
(vi) a combination of (iv) and (v); and
further comprising:
(vii) polytetrafluoroethylene;
wherein components (i) and (ii) comprise fluorosilicone gums, the self-lubricating silicone elastomer composition is hydrosilylation curable, and the polydiorganosiloxane polymer (v) (a) is fluoro containing.