Polycarbonate and use thereof

Details Polycarbonate and use thereof Polycarbonate and use thereof

1993-01-12

1995-01-24

Willis, Jr., Prince

Compositions

Electrolytes for electrical devices

252 68, 558265, 558266, C10M12902, C09K 500

Patent

active

053840569

ABSTRACT:
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.

REFERENCES:
patent: 2379252 (1945-06-01), Muskat et al.
patent: 2387934 (1945-10-01), Muskat et al.
patent: 3632828 (1972-01-01), Freuel
patent: 3725455 (1973-04-01), D'Angelo et al.
patent: 4072704 (1978-02-01), Langdon
patent: 4217298 (1980-08-01), Shikata et al.
patent: 5114605 (1992-05-01), Mizui et al.

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