| abstract |
(57) [Problem] To provide a method for producing a good foamed synthetic resin without using chlorinated fluorinated carbon or hydrogenated chlorinated fluorinated carbon as a foaming agent. SOLUTION: Two kinds of 1,1,1,3,3-pentafluoropropane and 1,1,1,2-tetrafluoroethane, A polyurethane foam is produced by reacting an active hydrogen compound with a polyisocyanate in the presence of water using a blowing agent optionally mixed with a low-boiling hydrocarbon such as cyclopentane. |