| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fluororesin fiber paper having an excellent low permittivity and low dielectric loss tangent and usable as a core material of a printed wiring board and to provide a method for producing the fluororesin fiber paper. SOLUTION: This fluororesin fiber paper consists essentially of fluororesin fibers and contains hollow inorganic microparticles. Interstices among the fluororesin fibers and joining points among the fluororesin fibers and the hollow inorganic microparticles are fused. The fluororesin fiber paper is prepared by aggregating the hollow inorganic microparticles, preparing a hollow inorganic microparticle aggregate, blending the hollow inorganic microparticle aggregate with the fluororesin fibers, forming a sheet of paper from the blend of the hollow inorganic microparticle aggregate and the fluororesin fibers according to a wet papermaking method, preparing a formed blend sheet of paper, heating the formed blend sheet of paper at a temperature not lower than the melting point of the fluororesin fibers and fusing the interstices among the fluororesin fibers and the joining points among the fluororesin fibers and the hollow inorganic microparticles.
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