POLYKETONE FIBER PAPER, POLYKETONE FIBER PAPER CORE MATERIAL FOR PRINTED WIRING BOARD AND PRINTED WIRING BOARD

摘要

Provided are an aliphatic polyketone fiber paper and a polyketone fiber paper core material for a printed wiring board which have high strength and high elasticity, are excellent in dimensional stability, chemical resistance, heat resistance, adhesiveness and electric insulation, exhibit a low permittivity and a low water absorbance, and are thin, porous and uniform. Further, a printed wiring board using the above core material which exhibits a low permittivity and is excellent in dimensional stability, electric insulation, the uniformity in making a hole by a laser, and the like is provided. An aliphatic polyketone fiber paper and a core material for a printed wiring board which contain 1 to 100 mass % of an aliphatic polyketone fiber comprising a recurring unit represented by the following formula (1) and having an average fiber length of 0.5 to 10 mm and an average fiber diameter of 0.1 to 20 µm, have a thickness of 5 to 200 µm, a porosity of 30 to 90 % and a strength per unit mass of 100 MN/kg or more; and a printed wiring board which comprises a single or plural layers formed by impregnating the core material with a polymer resin, a low permittivity polymer resin, or a polyphenylene ether type epoxy resin or by applying the above resin on the core material. -CH₂-CH₂-CO- (1)