| abstract |
PURPOSE:To obtain the title grease having a low coefficient of friction and also a low axial force and capable of reducing the unpleasantness of riders by mixing a specified base grease with specified organomolybdenum compounds, an extreme-pressure additive comprising a specified organozinc compound, and a specified copolymer. CONSTITUTION:A base grease consisting of a mineral oil and a urea compound is mixed with, based on the weight of a grease composition, organomolybdenum compounds comprising 0.5-5wt.% molybdenum dithiocarbamate and 0.5-5wt.% molybdenum dithiophosphate, 0.5-10wt.% extreme-pressure additive comprising zinc dithiophosphate, and 0.5-60wt.% ethylene/branched alpha-olefin copolymer or 2-70wt.% ethylene/olefin copolymer or 2-85wt.% ethylene/polymethacrylate copolymer to thereby mix the base oil with the copolymer, thus giving the title grease having a kinematic viscosity of 13-460cSt at 100 deg.C. |