With Organic Chalcogen Compound That Does Not Contain Phosphorus Patents (Class 508/378)
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Patent number: 6114288Abstract: Lubricating oil composition for internal combustion engines having a high temperature shear viscosity of from 2.1 to less than 2.9 mPas wherein the lubricating base oil comprises 1) a zinc dialkyldithiophosphate, 2) a metallic detergent chosen from calcium alkylsalicylate and a mixture of calcium alkylsalicylate and magnesium alkylsalicylate and optionally 3) friction modifier.Type: GrantFiled: May 3, 1999Date of Patent: September 5, 2000Assignee: Shell Research LimitedInventors: Takashi Fujitsu, Koichi Kubo, Mitsuhiro Nagakari
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Patent number: 6063741Abstract: An engine oil composition is composed of: (1) at least one oil selected from the group consisting of a mineral oil and a synthetic lubricant as a base oil; (2) a molybdenum dithiocarbamate in an amount of 50 to 2000 ppm by weight when calculated as molybdenum (Mo), relative to the total weight of the engine oil composition; (3) zinc dithiophosphate in an amount of 0.01 to 0.2 wt % when calculated as phosphorus (P), relative to the total amount of the engine oil composition; and (4) an ashless organic polysulfide compound in an amount of 0.01 to 0.4 wt % when calculated as sulfur (S), relative to the total amount of the engine oil composition.Type: GrantFiled: November 7, 1997Date of Patent: May 16, 2000Assignees: Japan Energy Corporation, Toyota Jidosha Kabushiki KaishaInventors: Yasushi Naitoh, Kenyu Akiyama
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Patent number: 6010988Abstract: A lubricating oil composition for a wet clutch, particularly for an automatic transmission, which comprises mineral oil, synthetic oil or a mixture thereof as a base oil, and which contains 0.1 to 4.0% by weight of at least one compound selected from the group consisting of calcium sulfonate and calcium phenate, 0.1 to 0.5% by weight of zinc dithiophosphate, and 0.1 to 1.5% by weight of a bisphenol antioxidant, each based on the total weight of the lubricating oil composition. The composition has excellent initial anti-shudder properties, anti-shudder properties of long duration, and good thermal-oxidative stability.Type: GrantFiled: September 14, 1998Date of Patent: January 4, 2000Assignee: Mitsubishi Oil Co., Ltd.Inventors: Toru Matsuoka, Hisayuki Wada, Susumu Yoshida, Naozumi Arimoto
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Patent number: 5952273Abstract: A grease composition for constant velocity joints comprising: (a) a base oil; (b) a diurea thickener of the formula (1):R.sup.1 NH--CO--NH--C.sub.6 H.sub.4 -p-CH.sub.2 --C.sub.6 H.sub.4 -p-NH--CO--NHR.sup.2wherein R.sup.1 and R.sup.2 may be the same or different and represent aryl groups having 6 or 7 carbon atoms or cyclohexyl groups; (c) a molybdenum dialkyldithiocarbamate; (d) molybdenum disulfide; (e) at least one extreme pressure agent selected from the group consisting of zinc dithiophosphates, and sulfur-nitrogen extreme pressure agents; and (f) a phosphorus-free sulfur extreme pressure agent. The grease composition has low coefficient of friction, good performance for reducing induced thrust and high durability.Type: GrantFiled: March 25, 1998Date of Patent: September 14, 1999Assignees: Kyodo Yushi Co., Ltd,, NTN CorporationInventors: Yoichi Suzuki, Takashi Okaniwa, Yukio Asahara, Keizo Nagasawa, Mitsuhiro Kakizaki, Kiyoshi Takeuchi, Yukio Hasegawa, Shinichi Takabe
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Patent number: 5858931Abstract: A lubricating composition of the present invention comprises a base oil for lubricating oil or base grease; at least one molybdenum compound as component (A) selected from the group consisting of a selected sulfurized oxymolybdenum dithiocarbamate, a selected sulfurized oxymolybdenum dithiophosphate and a selected molybdenum amine compound; and a (poly)glycerol ether and/or a (poly)oxyalkylene glycol monoalkyl ether as component (B).Type: GrantFiled: August 5, 1996Date of Patent: January 12, 1999Assignee: Asahi Denka Kogyo K.KInventors: Noriyoshi Tanaka, Aritoshi Fukushima, Yukio Tatsumi, Kazuhisa Morita, Yoko Saito
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Patent number: 5849675Abstract: A hydraulic system containing a piston-type pump having wear surfaces containing copper or a copper alloy, and, optionally, a vane-type pump having wear surfaces containing steel, uses an antiwear hydraulic fluid having an oil of lubricating viscosity and minor amounts of zinc dithiophosphate and a wear moderating agent. The wear moderating agent can be aliphatic polyol esters, boric acid derivatives of aliphatic polyol esters, aliphatic amines, aliphatic polyamines, aliphatic imidazolines, or mixtures of any combination thereof. The aliphatic groups of the wear moderating agent are substantially straight-chained, and the wear moderating agent contains at least ten carbon atoms.Type: GrantFiled: April 10, 1997Date of Patent: December 15, 1998Assignee: Chevron Chemical CompanyInventors: Stuart H. Brown, Todd Brookhart
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Patent number: 5786307Abstract: A lubricating oil composition useful for internal combustion engines comprises a base oil, and, as combined therewith, specified amounts of a molybdenum dialkyl-dithiocarbamate, a selected zinc dihydrocarbyl dithiophosphate and a selected copper carboxylate, respectively. The oil composition exhibits a high friction-reducing effect when the oil is fresh and maintains the same effect even after the oil has been deteriorated.Type: GrantFiled: October 23, 1996Date of Patent: July 28, 1998Assignee: Nippon Oil Co., Ltd.Inventors: Jinich Igarashi, Kazuhiro Yagishita, Kiyoshi Azami
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Patent number: 5744430Abstract: There is provided a composition having therein a base oil with a specified kinematic viscosity and with a specified total amount of aromatics, comprising, in specified amounts based on the total weight of the composition:(b) an alkaline earth metal salicylate detergent;(c) a zinc dialkyldithiophosphate;(d) a succinimide ashless dispersant containing a polybutenyl group having a specified number-average molecular weight;(e) a phenol ashless antioxidant;(f) a molybdenum dithiocarbamate friction modifier; and(g) a viscosity index improver in such an amount that the kinematic viscosity of said composition ranges from 5.6 to 12.5 mm.sup.2 /s at 100.degree. C. The present invention provides an engine oil which has excellent fuel consumption and maintains the fuel consumption for a long period of time.Type: GrantFiled: April 25, 1996Date of Patent: April 28, 1998Assignee: Nippon Oil Co., Ltd.Inventors: Kiyoshi Inoue, Yasuhisa Yamada, Akira Yaguchi, Masakuni Hirata
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Patent number: 5736491Abstract: A method of improving the fuel economy characteristic of a lubricant by friction reduction including mixing the lubricant with a C.sub.2 to C.sub.12 aliphatic carboxylate salt of molybdenum and a zinc dialkyldithiophosphate or zinc dialkyldithiocarbamate is disclosed. The synergistic interaction of the aliphatic carboxylate salt of molybdenum and the zinc salt results in at least a 30% reduction in the coefficient of friction at 100.degree. C.Type: GrantFiled: January 30, 1997Date of Patent: April 7, 1998Assignee: Texaco Inc.Inventors: Jitendra A. Patel, Arthur J. Stipanovic, Jeffrey P. Schoonmaker
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Patent number: 5700765Abstract: An additive system and method of use that significantly extend the service life of petroleum based hydraulic fluids, improve antiwear properties, improve demulsibility, condition and swell seals to prevent leaking, increase oxidation life, improve thermal stability, improve corrosion resistance, improve antifoam characteristics, reduce the acid number of used hydraulic oils, and exhibit improved shelf stability and improved low temperature performance when compared to additive systems previously known, the additive system containing as essential elements a stabilized zinc dialkyldithiophosphate, a substituted sulfolane, an alkyl phenol and an effective amount of a solvent alcohol component selected from C.sub.9 -C.sub.11 or C.sub.12 -C.sub.13 alcohols, or other suitable alcohol blends, with or without other suitable adjunctive solvents such as aromatics or aromatic/ketone blends.Type: GrantFiled: August 3, 1995Date of Patent: December 23, 1997Assignee: NCH CorporationInventors: John Franklin Barnes, Karl N. Gutzke, Robert M. Hooks
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Patent number: 5627294Abstract: An alcohol and/or a carboxylic acid or carboxylate is used to reduce the proportion of sediment obtained in the manufacture of a metal or ammonium dihydrocarbyl dithiophosphate, for example, a zinc dihydrocarbyl dithiophosphate (ZDDP) for use as an antiwear agent/antioxidant in crankcase lubricating oils.Type: GrantFiled: February 24, 1995Date of Patent: May 6, 1997Assignee: Exxon Chemical Patents Inc.Inventors: David R. Adams, Patrick F. Ginnelly
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Patent number: 5604188Abstract: Novel zinc additives are provided which function as antioxidants and extreme pressure agents for lubricants and possess high thermal stability. In addition, they exhibit good filterability performance and good corrosion resistance. The zinc-containing additives are formed by admixing (i) at least one zinc dialkyldithiophosphate wherein each alkyl group contains 6 to 12 carbon atoms and is branched on its beta-carbon atom, and (ii) at least one zinc alkanoate wherein each alkanoate group is branched on its beta-carbon atom, in a ratio of 6.0 to 8.0 equivalents of (i) per equivalent of (ii).Type: GrantFiled: September 18, 1995Date of Patent: February 18, 1997Assignee: Ethyl Petroleum Additives LimitedInventor: Helen T. Ryan