| 摘要 |
PROBLEM TO BE SOLVED: To provide a foamed material having a low dielectric constant, which is a thin film, is smooth and has heat resistance and to provide a method for producing the same. SOLUTION: The method for producing a formed material comprises: a process for holding a material in a container, raising pressure in the container to fixed pressure by using inorganic gas, heating the inside of the container to a given temperature and keeping the temperature for a fixed time; and a process for reducing the pressure to atmospheric pressure after passage of a fixed time. The formed material has 1.0-3.0 dielectric constant, 10%-90% porosity, and 0.01-10μm average pore diameter. The material is a polyamide such as a thermoplastic polyimide, a polyether imide, etc. COPYRIGHT: (C)2006,JPO&NCIPI |
