| abstract |
Process for preparing polyurethane integral skin foams using a blowing agent mixture that contains or consists of 50 to 99 % by weight of 1,1,1,3,3-pentafluorobutane (HFC 365mfc) and 1 to 50 % by weight of at least one fluorinated hydrocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane (HFC 134a), 1,1,1,3,3-pentafluoropropane (HFC 245fa), 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea). |