POLYCARBONATES, USES THEREOF, PROCESSES FOR PREPARING AND PURIFYING SAME

• Main Authors: MASAHIDE TANAKA, TAZUKI TAKAHATA ET AL, YOSHIHISA KISO
• Format: Patent
• Language: English
• Published: 22.04.1992
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; BASIC ELECTRIC ELEMENTS; CABLES; CHEMISTRY; COMPOSITIONS BASED THEREON; CONDUCTORS; DERIVATIVES THEREOF; ELECTRICITY; FUELS; INSULATORS; LUBRICANTS; LUBRICATING COMPOSITIONS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NUCLEIC ACIDS; NUCLEOSIDES; NUCLEOTIDES; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; SUGARS; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION

The polycarbonates of the present invention include 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.