Blowing agent blends

Abstract

Foam blowing agents blends of 5-50 mole % HCFC-22 and 95-50 mole % of n-pentane, i-pentane and/or cyclopentane are provided, as are polyol premixes and polyurethane foam compositi ons containing such blends.

1 . A foam blowing agent composition comprising 
 (a) about 5 to 50 mole % of chlorodifluoromethane and    (b) about 95 to 50 mole % of a pentane selected from the group consisting of one or more of n-pentane, i-pentane and cyclopentane.    
     
     
         2 . The composition of    claim 1    wherein the pentane is a mixture of i-pentane and cyclopentane.  
     
     
         3 . A foam blowing agent composition comprising 
 (a) about 5 to 50 mole % of chlorodifluoromethane and    (b) about 95 to 50 mole % of a pentane selected from the group consisting of one or more of n-pentane and i-pentane.    
     
     
         4 . A foam premix composition comprising a polyol and the foam blowing agent composition of    claim 1   .  
     
     
         5 . A foam premix composition comprising a polyol and the foam blowing agent composition of    claim 2   .  
     
     
         6 . A foam premix composition comprising a polyol and the foam blowing agent composition of    claim 3   .  
     
     
         7 . A polyurethane foam composition comprising an isocyanate, a polyol and the foam blowing agent composition of    claim 1   , said foam composition having (a) an A-side which contains the isocyanate and, optionally, a portion of the foam blowing agent composition and (b) a B-side which contains the polyol and the balance of the foam blowing agent composition.  
     
     
         8 . A polyurethane foam composition comprising an isocyanate, a polyol and the foam blowing agent composition of    claim 2   , said foam composition having (a) an A-side which contains the isocyanate and, optionally, a portion of the foam blowing agent composition and (b) a B-side which contains the polyol and the balance of the foam blowing agent composition.  
     
     
         9 . A polyurethane foam composition comprising an isocyanate, a polyol and the foam blowing agent composition of    claim 3   , said foam composition having (a) an A-side which contains the isocyanate and, optionally, a portion of the foam blowing agent composition and (b) a B-side which contains the polyol and the balance of the foam blowing agent composition.