Kyodo Yushi Co., Ltd.

Denso Corporation

Kyosuke Ikuma

Mitsuhiro Kakizaki

Shozo Ikejima

Iwaki Hirooka

Koji Sakakibara

Koji Hisaka

Suehiro Okazaki

Yosuke Endo

Akihiko Urashima

Yosuke Takao

Takashi Takizawa

The invention provides a grease composition capable of smoothly operating the lubricated parts even under wide-ranging temperature conditions, and at the same time, exhibiting excellent noise reducing effect on the lubricated parts. The grease composition containing a base oil and a thickener is provided, wherein the base oil includes at least one first base oil selected from the group consisting of poly-&#x3b1;-olefins and ethylene-&#x3b1;-olefin oligomers and at least one second base oil selected from the group consisting of polybutene, polyisobutylene, polymethacrylate, and styrene based copolymers, with the first base oil being contained in an amount of 65 mass % or more and the second base oil being contained in an amount of 1 mass % or more and less than 35 mass % based on the total mass of the base oil, the base oil having a kinematic viscosity of 350 to 1400 mm/s at 40&#xb0; C., the first base oil having a kinematic viscosity of 300 to 1200 mm/s at 40&#xb0; C., and the second base oil having a kinematic viscosity of 1500 to 200,000 mm/s at 40&#xb0; C.

Noise reducing grease composition

A grease composition having a thickener, a base oil containing a hydrocarbon oil, and a polymer alloy of an olefin copolymer and a styrene-based copolymer is disclosed.

Grease composition comprising polymer alloy, a structure part enclosing the same and a method for producing the grease composition

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Fujisawa, Japan

Kyosuke Ikuma