| 摘要 |
PURPOSE:To solve the problem of ozone layer depletion in the production of the title foam by using a blowing agent comprising a specific 1-3C fluorinated hydrocarbon having part or all of the hydrogen atoms substd. by fluorine atoms. CONSTITUTION:The title foam is produced by using a blowing agent comprising a 1-3C fluorinated hydrocarbon having part or all of the hydrogen atoms substd. by fluorine atoms. Examples of the blowing agent include tetrafluromethane, trifluoromethane, difluoromethane, hexafluoroethane, pentafluoroethane, 1,1.2,2- tetrafluoroethane, and 1,1,1,2-tetrafluoroethane. Thus is obtd. the title foam having properties equivalent or superior to those of the conventionally obtd. foam using a chlorofluorocarbon without the fear of ozone layer depletion. |
