Patent ID: 7531496

Claim:
An azeotrope-like 1,1,1,3,3-pentafluorobutane-containing composition, wherein said composition is selected from the group consisting of: (i) compositions consisting essentially of from about 1 to about 60 weight percent 1,1,1,2,3,4,4,5,5,5-decafluoropentane, from about 10 to about 97 weight percent 1,1,1,3,3-pentafluorobutane, from about 41 to about 50 weight percent trans-1,2-dichloroethylene and from about 1 to about 10 weight percent ethanol, wherein said composition has a vapor pressure of from about 116.2 kPa to about 119.3 kPa at a temperature of about 40° C.; (ii) compositions consisting essentially of from about 1 to about 50 weight percent nonafluoromethoxybutane, from about 20 to about 97 weight percent 1,1,1,3,3-pentafluorobutane, from about 36 to about 50 weight percent trans-1,2-dichloroethylene and from about 1 to about 9 weight percent isopropanol, wherein said composition has a vapor pressure of from about 107.0 kPa to about 113.6 kPa at a temperature of about 40° C.; and wherein after 50 weight percent of said composition has evaporated the vapor pressure of the remaining composition has changed by about 10 percent or less.