| 摘要 |
PURPOSE:To provide a closed-cell tetrafluoroethylene resin foam of improved moldability and a process for producing the same. CONSTITUTION:A closed-cell foam having a very high void volume can be obtained by molding a mixture of unexpanded spheres containing a blowing agent with an unfired tetrafluoroethylene resin powder into any desired shape, expanding the spheres by heating the molding and three-dimensionally fiberizing the unfired tetrafluoroethylene resin by using the expansion pressure. Because the microfibers of tetrafluoroethylene resin in this molding are lowly oriented in a specified direction, the strengths of the molding differ less when measured along all the directions. |
