| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyetherimide porous body which has a low relative permittivity and is not susceptible to fractures during folding (has excellent fracture resistance), and a method for producing the same.SOLUTION: This polyetherimide porous body comprises a polyetherimide cross-linked body and has a gel fraction of 10% or more, an average bubble diameter of 8 μm or less, a volume porosity of 30% or more and a dielectric breakdown voltage of 30 kV/mm or more. |
