	US 12,441,920 B2
	Seal rubber composition and sealing member
Katsuhiko Kusunoki, Itano-gun (JP); and Fumiaki Kasahara, Kashiwara (JP)
Assigned to KOYO SEALING TECHNO CO., LTD., Itano-gun (JP); and JTEKT CORPORATION, Kariya (JP)
Filed by KOYO SEALING TECHNO CO., LTD., Tokushima (JP); and JTEKT CORPORATION, Kariya (JP)
Filed on Sep. 20, 2022, as Appl. No. 17/948,685.
Claims priority of application No. 2021-158751 (JP), filed on Sep. 29, 2021.
Prior Publication US 2023/0159806 A1, May 25, 2023
Int. Cl. C09K 3/10 (2006.01); C08F 220/06 (2006.01); C08F 220/18 (2006.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01); C08K 7/14 (2006.01)

CPC C09K 3/1006 (2013.01) [C08F 220/06 (2013.01); C08F 220/18 (2013.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01); C08K 7/14 (2013.01); C08K 2201/003 (2013.01); C08K 2201/004 (2013.01)]

5 Claims

1. A seal rubber composition containing a carboxyl group-containing acrylic rubber, silica, and two or more inorganic fibers, wherein

an amount of the silica per 100 parts by weight of the carboxyl group-containing acrylic rubber is 25 to 100 parts by weight,

a total amount of the inorganic fibers per 100 parts by weight of the carboxyl group-containing acrylic rubber is 35 to 90 parts by weight,

at least glass fiber and calcium silicate fiber are contained as the inorganic fibers,

an amount of the glass fiber per 100 parts by weight of the carboxyl group-containing acrylic rubber is 5 to 20 parts by weight, and

an amount of the calcium silicate fiber per 100 parts by weight of the carboxyl group-containing acrylic rubber is 30 to 70 parts by weight.