Refrigeration compositions having polyoxyalkylene glycols with alkylene groups having at least 4 carbon atoms therein
US5254280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Jul 28, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/50
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to polyoxyalkylene glycols which are used to flush currently used lubricants such as mineral oil, alkyl benzenes, and esters from a refrigeration system for conversion to fluorocarbon or hydrofluorocarbon refrigerants. The polyoxyalkylene glycol is selected from the group consisting of polyoxyalkylene glycol which is at least difunctional with respect to hydroxyl groups, polyoxyalkylene glycol having an alkyl cap on one end thereof, and polyoxyalkylene glycol having at least two alkyl caps. The polyoxyalkylene glycol has a molecular weight of about 300 to about 4,000, has a viscosity of about 5 to 150 centistokes at 37.degree. C., and is made from alkylene oxide having at least 4 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.