	US 12,480,069 B2
	Magnetic viscous fluid and mechanical device
Hirohisa Ishizaki, Tokyo (JP); and Akira Ochiai, Tokyo (JP)
Assigned to SOMAR CORPORATION, Tokyo (JP)
Appl. No. 18/695,285
Filed by SOMAR CORPORATION, Tokyo (JP)
PCT Filed Nov. 1, 2023, PCT No. PCT/JP2023/039518 § 371(c)(1), (2) Date Mar. 25, 2024, PCT Pub. No. WO2024/106210, PCT Pub. Date May 23, 2024.
Claims priority of application No. 2022-185268 (JP), filed on Nov. 18, 2022.
Prior Publication US 2024/0327745 A1, Oct. 3, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C10M 127/06 (2006.01); C10M 105/38 (2006.01); C10M 107/02 (2006.01); C10M 111/04 (2006.01); C10M 125/12 (2006.01); C10M 125/26 (2006.01); C10M 141/00 (2006.01); C10M 155/02 (2006.01); C10M 161/00 (2006.01); C10M 169/04 (2006.01); F16F 9/53 (2006.01); H01F 1/44 (2006.01); C10N 40/08 (2006.01); C10N 40/14 (2006.01)

CPC C10M 169/044 (2013.01) [C10M 105/38 (2013.01); C10M 107/02 (2013.01); C10M 111/04 (2013.01); C10M 125/12 (2013.01); C10M 125/26 (2013.01); C10M 127/06 (2013.01); C10M 141/00 (2013.01); C10M 155/02 (2013.01); C10M 161/00 (2013.01); H01F 1/44 (2013.01); C10M 2201/064 (2013.01); C10M 2201/102 (2013.01); C10M 2203/06 (2013.01); C10M 2205/0206 (2013.01); C10M 2207/2835 (2013.01); C10M 2229/02 (2013.01); C10N 2040/08 (2013.01); C10N 2040/185 (2020.05)]

6 Claims

1. A magnetic viscous fluid comprising a magnetic particle, base oil and an alkylnaphthalene having an alkyl group with 10 to 24 carbons, further comprising an inorganic cation exchanger with a siloxane bond, and silicone oil, and not comprising coloring agents,

wherein the base oil comprises ester base oil and non-polar base oil, and

a non-polarity index of the base oil is in the range of 10 to 45.