Back to results
US 10,377,964 B2Granted
Magneto-rheological grease composition
AssigneesKyodo Yushi Co., Ltd., Yokohama National University
InventorsHiroshi Kimura, Shinya Kondo, Tetsuo Ogawa, Makoto Hayama, Koji Maesaka, Shin Morishita, Ken Nakano, Toshihiko Shiraishi
Life of this patent
Estimating the term…
Abstract
The invention provides a magneto-rheological grease composition which contains (a) a base oil including at least 30% by mass of an ether type synthetic oil; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition. The magneto-rheological grease composition can show superior thermal stability, dispersion stability and magneto-rheological properties.
Claims11
A magneto-rheological grease composition comprising:
- (a) a base oil comprising at least 30% by mass of an ether type synthetic oil having a kinetic viscosity at 40° C. of 60 to 140 mm2/s;
- (b) an aliphatic diurea thickener;
- and
- (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition,
- wherein the aliphatic diurea thickener is represented by formula (1):
- wherein R1 and R2 are a straight-chain or branched alkyl group having 6 to 20 carbon atoms, and wherein R1 and R2 are the same.
3 more elements
Dependencies are inferred from the claim text.