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AssigneeJsp Corporation
InventorsMasakazu Sakaguchi, Kouki Nishijima, Masaharu Oikawa
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Provided are polyvinylidene fluoride resin expanded beads which can be molded by in-mold molding and thus stably provide, without impairing excellent characteristics inherent in polyvinylidene fluoride resin, molded articles having excellent mechanical properties. Polyvinylidene fluoride resin expanded beads, characterized in that when 1 to 3 mg of the expanded beads are subjected to heat-flux type differential scanning calorimetry (DSC) wherein the beads are heated from 25° C. to 200° C. at a temperature rise rate of 10° C./min, the obtained DSC curve (of first heating) has both an inherent endothermic peak which is inherent in polyvinylidene fluoride resin and one or more higher-temperature endothermic peaks which appear on the higher-temperature side of the inherent endothermic peak, the quantity of heat of melting of the higher-temperature endothermic peaks being at least 0.5 J/g.
An expanded polyvinylidene fluoride resin beads, wherein a DSC curve that is measured when from 1 to 3 mg of the expanded fluoride resin beads are heated from 25° C. to 200° C. at a heating rate of 10° C./min by a heat flux differential scanning calorimetry (a DSC curve of first heating) has an endothermic peak that is inherent peak in the polyvinylidene fluoride resin and one or more endothermic peaks (high-temperature peaks) on the higher-temperature side of the inherent peak, and the high-temperature peaks have a calorific value of 0.5 to 30 J/g.
Dependencies are inferred from the claim text.