US 11,746,303 B2
Grease composition
Kouji Takane, Chiba (JP); Go Watanabe, Chiba (JP); Akihiro Shishikura, Chiba (JP); and Jun Yamashita, Funabashi (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
Appl. No. 17/423,252
Filed by IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
PCT Filed Jan. 31, 2020, PCT No. PCT/JP2020/003580
§ 371(c)(1), (2) Date Jul. 15, 2021,
PCT Pub. No. WO2020/158907, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-016162 (JP), filed on Jan. 31, 2019.
Prior Publication US 2022/0073837 A1, Mar. 10, 2022
Int. Cl. C10M 169/00 (2006.01); F16C 33/10 (2006.01); C10M 101/02 (2006.01); C10M 107/02 (2006.01); C10M 115/08 (2006.01); C10M 129/74 (2006.01); C10M 133/12 (2006.01); C10M 141/06 (2006.01); C10N 20/06 (2006.01); C10N 30/02 (2006.01); C10N 30/10 (2006.01); C10N 30/12 (2006.01); C10N 40/02 (2006.01); C10N 50/10 (2006.01)
CPC C10M 169/00 (2013.01) [C10M 101/02 (2013.01); C10M 107/02 (2013.01); C10M 115/08 (2013.01); C10M 129/74 (2013.01); C10M 133/12 (2013.01); C10M 141/06 (2013.01); F16C 33/102 (2013.01); C10M 2203/003 (2013.01); C10M 2205/0206 (2013.01); C10M 2207/283 (2013.01); C10M 2215/1026 (2013.01); C10M 2215/26 (2013.01); C10N 2020/06 (2013.01); C10N 2030/02 (2013.01); C10N 2030/10 (2013.01); C10N 2030/12 (2013.01); C10N 2040/02 (2013.01); C10N 2050/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A lubricating method, comprising:
lubricating a bearing used under a high-speed rotation condition with a DN value of 100,000 or more by a grease composition that comprises:
a base oil (A), and
a urea-based thickener (B),
wherein particles containing the urea-based thickener (B) in the grease composition have an arithmetic mean particle diameter of 2.0 μm or less on an area basis when measured by a laser diffraction scattering method.