| abstract |
PCT No. PCT/EP97/06908 Sec. 371 Date Jun. 16, 1999 Sec. 102(e) Date Jun. 16, 1999 PCT Filed Dec. 11, 1997 PCT Pub. No. WO98/27145 PCT Pub. Date Jun. 25, 1998Mixtures containing 50 to 99% by weight of 1,1,1,3,3-pentafluorobutane and 1 to 50% by weight of at least one fluorohydrocarbon selected from 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane, 1,1,1,3,3,3-hexafluoropropane, and 1,1,1,2,3,3,3-heptafluoropropane. The mixtures are extremely well suited for use as foaming gases for a blowing agent to produce foamed plastic materials, particularly polyurethane foams. The mixtures are not combustible and exhibit improved insulating properties, particularly when used at low temperatures. |