Polyalkylene glycol polycarbonate based lubricant oil composition
USRE36293E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1995 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Aug 9, 2015 |
Classification
- Technology area (CPC —)General
Abstract
The present invention provides lubricant oil compositions comprising a polyalkylene glycol carbonate. The lubricant oil compositions are useful for industrial gear oil, automotive gear oil, and lubricant oil for refrigerators, rolling installations and fibers, which are excellent in lubricating properties and detergency. The present invention also relates to lubricant oil compositions which comprise a polyalkylene glycol polycarbonate having mutual solubility with an ozone layer-nondestructive Freon such as Freon R-134a, and which are accordingly especially suited for refrigerators using hydrogenated fluorocarbon as a refrigerant. A polyalkylene glycol carbonate according to the invention comprises a polyoxypropylene group in the molecular chain and an alkyl group and an alkyloxyalkylene group at the molecular terminals. This invention provides a process for preparing said polyalkylene glycol polycarbonate wherein a polypropylene glycol and a carbonate are allowed to react, said reaction including condensation polymerization. The invention also provides a process without condensation polymerization for preparing a polyalkylene glycol polyol wherein a polyol and a carbonate is allow…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.