| 摘要 |
PURPOSE:To produce the title foam by using a specified compound which can substitute for the conventional chlorofluorocarbons, has the same excellent properties and can be used in the same manner as a blowing agent in the production of the title foam by mixing a styrenic resin with a blowing agent at high temperature and pressure and extruding the mixture into a lower pressure zone. CONSTITUTION:A process for producing the title foam by mixing a styrenic resin with a blowing agent at high temperature and pressure and extruding the mixture into a lower pressure zone, wherein at least one member selected from among fluorohydrocarbons derived by replacing part or the whole of the hydrogen atoms of a hydrocarbon by fluorine atoms, desirably perfluoropentane, perfluorohexane, perfluorobenzene, pentafluorobenzene, perfluoroalkyl hydride and dihydroperfluoroalkane, is used as the blowing agent. |
