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AssigneesKyodo Yushi Co., Ltd., Nissan Motor Co., Ltd.
InventorsKenji Sakai, Koichi Goto, Hitoshi Yokomizo, Kazuhiro Mitamura, Toshinori Kawai, Masatoshi Hirofuji
Estimating the term…
A graphite-free lubricating oil which comprises a base oil having dispersed therein 10 to 40% by weight of a carbohydrate and/or a derivative thereof whose particle size ranges from 10 to 150 .mu.m, 2 to 20% by weight of a film-boosting agent and 0.1 to 20% by weight of a dispersant. Moreover, the lubricating oil is free of black-colored substances such as graphite. Therefore, the oil permits the improvement of working surroundings and exhibits excellent properties such as formability through forging almost comparable to or even greater than that of the commercially available graphite-in-oil type lubricating oils. The lubricating oil can be used instead of the graphite-containing lubricating oils for warm forging, hot forging, rolling, tube-manufacturing, drawing and extrusion in place of the graphite-containing lubricating oils and ensures the improvement in the working surroundings and excellent lubricity.
A graphite-free lubricating oil comprising a base oil having dispersed therein 10 to 40% by weight of a carbohydrate and/or a derivative thereof whose particle size ranges from 10 to 150 .mu.m, 2 to 20% by weight of a film-boosting agent and 0.1 to 20% by weight of a dispersant, wherein the dispersant is a member selected from the group consisting of sodium sulfonate, calcium sulfonate, calcium phenate, linear or branched C.sub.12 -C.sub.22 monocarboxylic acid sorbitan triesters, linear or branched C.sub.12 -C.sub.22 monocarboxylic acid sucrose esters, linear or branched C.sub.12 -C.sub.22 monocarboxylic acid dextrin esters, linear or branched C.sub.12 -C.sub.22 monocarboxylic acid cellulose esters, linear or branched C.sub.12 -C.sub.22 monocarboxylic acid starch esters, hardened castor oil, stearyl bisamide, stearylpropylenediamine, stearylpropylenediamine dioleate, dimer acid salts of palmitylpropylenediamine, aluminum stearate, calcium salt of tallow fatty acid and mixtures thereof.
Dependencies are inferred from the claim text.