| 摘要 |
The present invention is related to polyurethane foam materials, pores thereof being free of halogenated hydrocarbon compounds, in particular free of CFCs, and a process for producing the same wherein no halogenated hydrocarbon, in particular no CFC is used as foaming agent. The pores of the PUR foam material contain minor amounts of the vaporized foaming agent used in the process of the invention, i.e. of the organic liquid product selected from the group consisting of a lower alkane having 3 to 6 carbon atoms or a mixture of such lower alkanes, said liquid foaming agent having a boiling point between -10 and +70.degree.C at normal pressure. In the process of the present invention said foaming agent is either finely dispersed in the mixture of the alcoholic starting component and the isocyanate starting component or said foaming agent is first emulgated in the alcoholic starting component, if necessary with the aid of an emulgating agent, and the isocyanate component thereafter is added to this emulsion, and then the exothermic polymerization reaction of the starting components is effected. Possibly, the so produced PUR foam material is stored for several hours or days.
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