	US 12,264,236 B2
	Rubber composition for sealing material and sealing material using the same
Akira Ueda, Gojo (JP); Sayaka Yoshida, Gojo (JP); and Ryohei Nishihara, Gojo (JP)
Assigned to VALQUA, LTD., Tokyo (JP)
Appl. No. 17/442,194
Filed by VALQUA, LTD., Tokyo (JP)
PCT Filed Mar. 6, 2020, PCT No. PCT/JP2020/009615 § 371(c)(1), (2) Date Sep. 23, 2021, PCT Pub. No. WO2020/195696, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-058270 (JP), filed on Mar. 26, 2019.
Prior Publication US 2022/0186010 A1, Jun. 16, 2022
Int. Cl. C08L 23/16 (2006.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01); C09K 3/10 (2006.01)

CPC C08L 23/16 (2013.01) [C09K 3/1006 (2013.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01); C09K 2200/0208 (2013.01); C09K 2200/0247 (2013.01); C09K 2200/0494 (2013.01); C09K 2200/0607 (2013.01); C09K 2200/0617 (2013.01)]

6 Claims

1. A rubber composition for sealing material comprising:

100 parts by mass of a rubber component;

80 to 140 parts by mass of silica;

1 to 20 parts by mass of a silane coupling agent; and

15 to 35 parts by mass of carbon black,

wherein the rubber component is an ethylene-propylene-diene rubber and a content of ethylene-derived structural unit in the ethylene-propylene-diene rubber is greater than or equal to 45 mass % and less than or equal to 49 mass %.