Tonen Corporation

Takeshi Nomura

Hirotaka Tomizawa

Toshiaki Kuribayashi

Noboru Umemoto

Satoshi Ogano

Takehisa Sato

Katsuya Koganei

Takehisa Satoh

Kenji Ashibe

Masaaki Fukuda

Mitsuo Ohta

Hideki Osaka

A lubricating oil composition for two-cycle engines, consisting essentially of, by weight: (1) 30% to 70% of a polyol ester having a kinematic viscosity of 9 to 15 cSt at 100.degree. C., 30% to 70% of a diester having a kinematic viscosity of 2 to 5 cSt at 100.degree. C., 1% to 5% of a polybutene having a molecular weight of 500 to 2,500 and/or 1% to 5% of a polymethacrylate having a molecular weight of 5,000 to 40,000, and 5% to 25% of a dispersant; or (2) 30% to 70% of a polyol ester having a kinematic viscosity of 4 to 15 cSt at 100.degree. C., 0% to 35% of a complex ester having a kinematic viscosity of 10 to 14 cSt at 100.degree. C., 10% to 70% of a diester having a kinematic viscosity of 2 to 5 cSt at 100.degree. C., and. 5% to 25% of a dispersant; or (3) a lubricating oil base, 5% to 25% of a polyamide dispersant, and 0.1% to 5% of a combination of a neutral calcium sulfonate and a neutral calcium salicylate, based on the total weight of the composition. Composition (1) is excellent in biodegradability, miscibility with gasoline, anti-seizure performance and detergency. Composition (2) is excellent in biodegradability. Composition (3) has excellent high-temperature detergency and low viscosity at low temperature and can be also made excellent in biodegradability, miscibility with gasoline and anti-seizure performance when the oil base in composition (1) is used as a lubricating oil base.

Lubricating oil composition for two-cycle engines

A traction fluid lubricant is disclosed which contains a naphthenic ingredient having a weight average molecular weight of 200-300 and obtained by hydrogenating oligomers of cyclopentadiene having a ratio of the number of norbornenic double bond to that of cyclopentenic double bond of smaller than 0.9 but not smaller than 0.1. The naphthenic ingredient is suitably used in conjunction with an auxiliary ingredient selected from a polybutene having a viscosity of 5-60 cSt at 40.degree. C. and a bicyclohexyl compound.

Traction fluid derived from cyclopentadiene oligomers

The lubricating oil for refrigerator according to the present invention is a lubricating oil for refrigerator using 1,1,1,2-tetrafluoroethane refrigerant. Having esters as base oil, its viscosity range is between 2-30 mm/s at 100.degree.C. By adding esters alone or by adding esters having different viscosity to esters base oil, or by adding polymer, the viscosity is adjusted to obtain the lubricating oil suitable for various types of refrigerators. The lubricating oil thus obtained has excellent compatibility with 1,1,1,2-tetrafluoroethane refrigerant, which is an alternative to freon, and has low hygroscopic property and high heat-resistant property. By reducing the total acid number to 0.05 mg KOH/g or less, the corrosion-resistant property and insulating property of lubricating oil are not decreased, and the lubricating oil for refrigerator having having high refrigerant stability, hydrolytic stability and insulating property can be obtained. Further, by adding sulfur type anti-wear agent, the better anti-wear effect of the lubricating oil can be obtained on iron/aluminum contact portion in the refrigerator.

Lubricating oil for refrigerator

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Ohi, Japan

Takeshi Nomura