| 摘要 |
PURPOSE:To obtain a resin composition outstanding in waterproofness even when subjected to various conditions of heat cycles, by blending a crystalline resin with a melting temperature higher than a specified value containing vinylidene fluoride and another resin having a melting temperature different from that of the former resin. CONSTITUTION:The objective composition can be obtained by blending (A) 50-20wt.% of a crystalline resin with a melting temperature >=120 deg.C containing >=70wt.% of vinylidene fluoride (e.g., hexafluoropropylene-vinylidene fluoride copolymer) and (B) 50-30wt.% of a resin with a melting temperature <=100 deg.C (e.g., a crystalline resin containing <=70wt. of vinylidene fluoride, ethylene-vinyl acetate copolymer). This composition, comprising two kinds of resins mutually differing in melting temperatures, is outstanding in water resistance since these resins effectively compensate the gap developed, even under severe conditions of combination of heat cycle and chemical exposure.
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