Azeotrope-like compositions of pentafluoropropane and chloropropane

Abstract

This invention provides azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and 2-chloropropane that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.

What is claimed is:  
     
         1 . A method for producing polyurethane and polyisocyanurate foams comprising reacting and foaming a mixture of ingredients that react to form the polyurethane and polyisocyanurate foams in the presence of a volatile blowing agent comprising azeotrope-like compositions consisting essentially of from about 1 to about 90 weight percent 2-chloropropane and from about 10 to about 99 weight percent HFC-245fa.  
     
     
         2 . The method of  claim 1  wherein said azeotrope-like compositions consist essentially of from about 1 to about 40 weight percent 2-chloropropane and from about 60 to about 99 weight percent HFC-245fa.  
     
     
         3 . The method of  claim 2  wherein said azeotrope-like compositions consist essentially of from about 1 to about 10 weight percent 2-chloropropane and from about 99 to about 90 weight percent HFC-245fa.  
     
     
         4 . A closed cell foam composition prepared by foaming a polyisocyanate or polyisocyanurate in the presence of a blowing agent comprising the azeotrope-like compositions of  claim 1 .  
     
     
         5 . A closed cell foam composition prepared by foaming a polyisocyanate or polyisocyanurate in the presence of a blowing agent comprising the azeotrope-like compositions of  claim 2 .  
     
     
         6 . A closed cell foam composition prepared by foaming a polyisocyanate or polyisocyanurate in the presence of a blowing agent comprising the azeotrope-like compositions of  claim 3 .  
     
     
         7 . A closed cell foam containing a cell gas comprising a blowing agent composition comprising the azeotrope-like compositions of  claim 1 .  
     
     
         8 . A closed cell foam containing a cell gas comprising a blowing agent comprising the azeotrope-like compositions of  claim 2 .  
     
     
         9 . A closed cell foam containing a cell gas comprising a blowing agent comprising the azeotrope-like compositions of  claim 3 .  
     
     
         10 . A sprayable composition comprising a material to be sprayed and a propellant consisting essentially of from about 1 to about 90 weight percent 2-chloropropane and from about 10 to about 99 weight percent HFC-245fa.  
     
     
         11 . A sprayable composition according to  claim 10  wherein the sprayable composition is an aerosol.  
     
     
         12 . A sprayable composition according to  claim 11  wherein the sprayable composition is a cosmetic material.  
     
     
         13 . The composition of  claim 11  wherein the material to be sprayed is a medicinal material.