Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrocarbons

Abstract

Methods of preparing polyurethane and polyisocyanurate foams comprising the step of reacting and foaming a mixture of ingredients which react to form the polyurethane or polyisocyanurate foams in the presence of a blowing agent, wherein said blowing agent comprises an azeotrope-like composition consists essentially of 1,1,1,3,3-pentafluoropropane and n-pentane, as well as foams and foamable compositions comprising the azeotrope-like composition.

1 . A method of preparing polyurethane and polyisocyanurate foams comprising the step of reacting and foaming a mixture of ingredients which react to form the polyurethane or polyisocyanurate foams in the presence of a blowing agent, wherein said blowing agent comprises an azeotrope-like composition consists essentially of from about 95 to about 30 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 70 weight percent n-pentane. 
   
   
       2 . The method of  claim 1  wherein said azeotrope-like composition consists essentially of from about 95 to about 65 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 35 weight percent n-pentane. 
   
   
       3 . A foam comprising a polymer selected from polyurethane and polyisocyanurate and an azeotrope-like composition, wherein said azeotrope-like composition consists essentially of from about 95 to about 30 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 70 weight percent n-pentane. 
   
   
       4 . The foam of  claim 3  wherein said azeotrope-like composition consists essentially of from about 95 to about 65 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 35 weight percent n-pentane. 
   
   
       5 . The foam of  claim 3  wherein said polymer is a polyisocyanurate. 
   
   
       6 . The foam of  claim 3  wherein said polymer is polyurethane and said foam is a rigid, closed-cell foam. 
   
   
       7 . The foam of  claim 3  wherein said polymer is polyurethane and said foam is a flexible, open-cell foam. 
   
   
       8 . A foamable composition comprising a polyol or mixture of polyols, an isocyanate, and a blowing agent comprising an azeotrope-like composition consists essentially of from about 95 to about 30 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 70 weight percent n-pentane. 
   
   
       9 . The foamable composition of  claim 8  wherein said azeotrope-like composition consists essentially of from about 95 to about 65 weight percent 1,1,1,3,3-pentafluoropropane and from about 5 to about 35 weight percent n-pentane. 
   
   
       10 . The foamable composition of  claim 8  further comprising at least one component selected from the group consisting of catalyst, catalysts, fire retardants, water, and auxiliary blowing agents.