| 摘要 |
PURPOSE:To improve the adhesiveness of a core and sleeve, heat resistance and mechanical properties by using a resin essentially consisting of polycarbonate as a core material and a specific fluorine-contg. polymer as a sleeve material. CONSTITUTION:The titled fiber is formed by using the resin essentially consisting of the polycarbonate as its core material and the fluorine-contg. polymer contg. 1-15wt% unit expressed by the formula (where Rf is a perfluoroalkyl group) and having >=2g/10min melt index as its sleeve material. Said polymer is preferably a vinylidene fluoride/perfluoroalkyl vinyl ether copolymer, vinylidene fluoride/tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer, etc. The adhesiveness to the core material is not enough if the content of the unit expressed by the formula is <1wt%. The boundary with the core and the surface are not smooth and a linear fluctuation increases if the melt index is below the above-mentioned range.
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