Refrigerant mixture comprising difluoromethane and 1,1,1-trifluoroethane
US6231781A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2205/43
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A refrigerant composition useful as a substitute for chlorodifluoromethane (CHClF.sub.2, HCFC-22). The refrigerant composition has a first constituent of difluoromethane (CH.sub.2 F.sub.2, HFC-32); a second constituent of 1,1,1-trifluoroethane (CH.sub.3 CF.sub.3 ; namely, HFC-143a); and a third constituent selected from cyclopropane (C.sub.3 H.sub.6, RC-270), 1,1,1,2,3,3,3-heptafluoropropane (CF.sub.3 CHFCF.sub.3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH.sub.3 CF.sub.2 CF.sub.3, HFC-245cb), 1,1,1,2,3,3-hexafluoropropane (CHF.sub.2 CHFCF.sub.3, HFC-236ea), butane (C.sub.4 H.sub.10, R-600), bis(difluoromethyl)ether (CHF.sub.2 OCHF.sub.2, HFE-134) and pentafluoroethylmethylether (CF.sub.3 CF.sub.2 OCH.sub.3, HFE-245).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.