Idemitsu Kosan Company, Limited

Yusuke Nakanishi

Yukio Yoshida

Hiroki Sekiguchi

Yukitoshi Fujinami

Kouji Takane

Hiromu Kumagai

Yoshiyuki Suetsugu

Hideaki Hattori

The present invention addresses a problem of providing a grease composition that uses hydrophilic nanofibers but still has excellent water resistance and does not readily experience oil separation. The grease composition contains a base oil, hydrophilic nanofibers having a thickness (d) of 1 to 500 nm, and an organic bentonite.

Grease composition, mechanism component, and production method for grease composition

Provided is a grease containing a base oil and a hydrophilic nanofiber, the hydrophilic nanofiber having a thickness (d) of 0.01 to 500 nm being dispersed therein. The grease is low in an environmental load and excellent in safety on the human body and also has an appropriate worked penetration and has a high dropping point, and therefore, it is also excellent in heat resistance.

Grease, mechanical component, and method for producing grease

A grease composition contains a calcium sulfonate complex grease and an additive. The additive includes an overbased metal sulfonate and an antioxidant. The overbased metal sulfonate is preferably an overbased calcium sulfonate. The antioxidant is preferably an aminic antioxidant.

Grease composition

A bearing grease composition contains a (A) thickener and a (B) base oil, in which the (A) thickener is a urea thickener represented by a formula (I) below, and, in observation of a transmission image in the bearing grease composition, a transmission-image-area ratio of an aggregation part having a transmission image area exceeding 40 &#x3bc;min the urea thickener is 15% or less relative to a total observation area.RNHCONHRNHCONHR&#x2003;&#x2003;(I) In the formula, Rand Reach independently represent: an (a1) monovalent chain hydrocarbon group having 6 to 22 carbon atoms; an (a2) monovalent alicyclic hydrocarbon group having 6 to 12 carbon atoms; and the like, and Rrepresents an (a4) divalent aromatic hydrocarbon group having 6 to 15 carbon atoms.

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Ichihara, Japan

Yusuke Nakanishi