Mitsui Petrochemical Industries, Ltd.

Tadaaki Fujimoto

Kazunori Takahata

Masahide Tanaka

Tetsuo Hayashi

Katsuo Taniguchi

Takashi Hayashi

Yoshihisa Kiso

Kinya Mizui

Kenji Saeki

Kenji Shimamoto

Kosei Nakamura

The polycarbonates of the present invention include those of sucrose series having a specific cyclic structure, those of oligosaccharide and monosaccharide series other than the sucrose series, those derived from specific saccharides having no cyclic structure, those having a skeletal structure of pentaerythritol, neopentyl glycol or trimethylolmethane, and specific dicarbonates. The lubricating oil and electrical insulating oil of the invention contain the above-mentioned polycarbonates. The polycarbonates of the invention are excellent in compatibility with Freon R-134a (HFC) as well as in lubricating properties, detergency and electrical insulating properties, and are capable of providing lubricating oil for refrigerator, automotive engine oil, automotive gear oil, lubricating oil for rolling and lubricating oil for fiber, especially lubricating oil for which electrical insulating properties are required, and electrical insulating oil.

Polycarbonates, uses thereof, processes for preparing and purifying same

The polycarbonates of the present invention include those of sucrose series having a specific cyclic structure, those of oligosaccharide and monosaccharide series other than the sucrose series, those derived from specific saccharides having no cyclic structure, those having a skeletal structure of pentaerythritol, neopentyl glycol or trimethylolmethane, and specific dicarbonates. The lubricating oil and electrical insulating oil of the invention contain the above-mentioned polycarbonates. The polycarbonates of tile invention are excellent in compatibility with Freon R-134a (HFC) as well as in lubricating properties, detergency and electrical insulating properties, and are capable of providing lubricating oil for refrigerator, automotive engine oil, automotive gear oil, lubricating oil for rolling and lubricating oil for fiber, especially lubricating oil for which electrical insulating properties are required, and electrical insulating oil.

The polycarbonate of the invention is a polycarbonate derived from adducts such as propylene oxide adducts of polyglycerols. The lubricating oil of the invention comprises this polycarbonate, and if necessary, a specific polycarbonate having a --C.sub.2 H.sub.4 O-- group and/or a --CH.sub.2 CH(CH.sub.3)O-- group in its main chain. The lubricating oil of the invention can be used as a lubricating oil for refrigerators such as automotive air-conditioner and electric refrigerator. In particular, the lubricating oil of the invention is suitable as a lubricating oil for refrigerator wherein high-viscosity lubricating oil is used, for example, lubricating oil for automotive rotary air-conditioner, and also suitable as lubricating oil for a refrigerator wherein ozone layer-nondestructive hydrogenated fluorocarbon such as R-134a is used as a refrigerant.

Polycarbonate and use thereof

Alkali metal-supported catalyst

In a process for separating at least two alkyl phenols having close boiling points by azeotropic distillation of a mixture composed of the alkyl phenols with a hydrocarbon azeotroping agent, the improvement wherein said hydrocarbon azeotroping agent is selected from saturated aliphatic hydrocarbons of 9 to 13 carbon atoms having a boiling point of 150.degree. to 190.degree. C. at 760 mmHg.

Process for separation of alkyl phenols by azeotropic distillation

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Yamaguchi, Japan

Tadaaki Fujimoto