Hydrofluorocarbon compositions

Abstract

A composition which comprises 1,1,1,3,3-pentafluorobutane (HFC-365mfc) and 1,1,1,3,3-pentafluoropropane (HFC-245fa) in a weight ratio HFC-365mfc/HFC-245fa of from 60:40 to 75:25.

1 - 10 . (canceled) 
   
   
       11 . A composition which consists of 1,1,1,3,3-pentafluorobutane (HFC-365mfc) and 1,1,1,3,3-pentafluoropropane (HFC-245fa) in a weight ratio HFC-365mfc/HFC-245fa of from 60:40 to 73:27. 
   
   
       12 . The composition according to  claim 11 , wherein the weight ratio HFC-365mfc/HFC-245fa is from 65:35 to 73:27. 
   
   
       13 . The composition according to  claim 11 , wherein the weight ratio HFC-365mfc/HFC-245fa is from 67:33 to 72:28. 
   
   
       14 . The composition according to  claim 12 , wherein the weight ratio HFC-365mfc/HFC-245fa is about 70:30. 
   
   
       15 . A premix intended for the preparation of polyurethane or modified polyurethane foams comprising
 a) at least one polyol   b) a catalyst for the reaction of isocyanates with polyols   c) a composition according to  claim 12 .   
   
   
       16 . A process for the manufacture of polyurethane or modified polyurethane foams in which at least one isocyanate is reacted with at least one polyol in the presence of at least one catalyst and in the presence of the composition according to  claim 12 . 
   
   
       17 . A polyurethane or modified polyurethane foam which is obtainable according to the process of  claim 16 . 
   
   
       18 . The polyurethane or modified polyurethane foam according to  claim 17 , which is a rigid closed cell foam. 
   
   
       19 . A thermal insulation material, which comprises a polyurethane or modified polyurethane foam according to  claim 17 . 
   
   
       20 . A thermal insulation material, which comprises the polyurethane or modified polyurethane foam according to  claim 18 . 
   
   
       21 . A composition which consists of 1,1,1,3,3-pentafluorobutane (HFC-365mfc) and 1,1,1,3,3-pentafluoropropane (HFC-245fa) in a weight ratio HFC-365mfc/HFC-245fa of from 60:40 to 65:35. 
   
   
       22 . The composition according to  claim 21 , wherein the weight ratio HFC-365mfc/HFC-245fa is 60:40. 
   
   
       23 . A premix intended for the preparation of polyurethane or modified polyurethane foams comprising
 a) at least one polyol   b) a catalyst for the reaction of isocyanates with polyols   c) a composition according to  claim 21 .   
   
   
       24 . A process for the manufacture of polyurethane or modified polyurethane foams in which at least one isocyanate is reacted with at least one polyol in the presence of at least one catalyst and in the presence of the composition according to  claim 21 . 
   
   
       25 . A polyurethane or modified polyurethane foam which is obtainable according to the process of  claim 24 . 
   
   
       26 . The polyurethane or modified polyurethane foam according to  claim 25 , which is a rigid closed cell foam. 
   
   
       27 . A thermal insulation material, which comprises a polyurethane or modified polyurethane foam according to  claim 25 . 
   
   
       28 . A thermal insulation material, which comprises the polyurethane or modified polyurethane foam according to  claim 26 . 
   
   
       29 . The composition as claimed in  claim 12 , wherein the composition when used in a premix with polyols does not present a flash point.