Refrigerant compositions

Abstract

Refrigerant compositions are disclosed which comprise: (a) pentafluoroethane, octafluoropropane, trifluoromethoxydifluoromethane or nexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount of at least about 35% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, 1,1-difluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of at least bout 30% by weight based on the weight of the composition and (c) n-butane, in an amount from about 2.3 to about 4% by weight based on the weight of the composition.

1 - 27 . (canceled)  
     
     
         28 . A refrigerant composition which consisting essentially of: 
 a. pentafluoroethane in an amount from 5 to 60% based on the weight of the composition,    b. at least on second component selected from the group consisting of 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, or a mixture thereof, in an amount from 30 to 94% by weight based on the weight of the composition and    c. an unsubstituted hydrocarbon of the formula C n H m  in which n is at least 4 and m is at least 2n−2, other than methyl propane, in an amount from 1 to 10% based on the weight of the composition.    
     
     
         29 . The composition according to  claim 28  in which component (c) is present in an amount from 2 to 6% by weight based on the weight of the composition.  
     
     
         30 . The composition according to  claim 29  in which component (c) is present in an amount from 3 to 4% by weight based on the weight of the composition.  
     
     
         31 . A composition according to  claim 28  which comprises pentafluoroethane in an amount from 5 to 20% by weight based on the weight of the composition.  
     
     
         32 . The composition according to  claim 28  which further consists essentially of an additional component selected from a lubricant, an additive, or a mixture thereof.  
     
     
         33 . The composition according to  claim 32 , wherein the lubricant is further selected from the group consisting of mineral oils, alkylbenzene lubricants, synthetic lubricants, and fluorinated oils and mixtures thereof; and 
 an additive is selected from the group consisting of selected from the group consisting of extreme pressure, antiwear improvers, oxidation inhibitors, thermal stability improvers, corrosion inhibitors improvers, viscosity index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters.    
     
     
         34 . A composition according to claim  1  in which component (c) is n-butane.  
     
     
         35 . A composition according to  claim 34  which comprises: where in the component c) in an amount from about 2.3 to about 4% by weight based on the weight of the composition.  
     
     
         36 . A composition according to  claim 35  in which component (c) is present in an amount from about 2.3 to 3.5% by weight based on the weight of the composition.  
     
     
         37 . A composition according to  claim 28  in which component (a) is present in an amount from 35 to 60% by weight based on the weight of the composition.  
     
     
         38 . A composition according to  claim 28  in which component (a) is present in an amount from 40 to 55% by weight based on the weight of the composition.  
     
     
         39 . A composition according to  claim 28  in which component (a) is present in an amount from 45 to 52% by weight based on the weight of the composition.  
     
     
         40 . A composition according to  claim 28  in which component (b) is present in an amount from 45 to 60% by weight based on the weight of the composition.  
     
     
         41 . A composition according to  claim 28  in which component (b) is present in an amount from 47.5 to 55% by weight based on the weigh of the composition.