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    • 96. 发明授权
    • Polypropylene resin foamed bead and molded article therefrom
    • 聚丙烯树脂发泡珠粒及其成型制品
    • US08394867B2
    • 2013-03-12
    • US12451334
    • 2008-04-16
    • Hidehiro SasakiYasunori Nakamura
    • Hidehiro SasakiYasunori Nakamura
    • C08J9/00C08J9/16C08J9/22C08J9/228C08J9/35
    • C08J9/16C08J9/232C08J2323/14
    • Improved polypropylene resin foamed beads that without detriment to the excellence in properties, such as compression properties and heat resistance, characterizing the polypropylene resin foamed beads, can provide a polypropylene resin foamed bead molded article with equal properties by an molding conducted at low heating temperature. There are disclosed polypropylene resin foamed beads composed of a polypropylene resin of 115 to 135° C. melting point and 500 MPa or higher Olsen flexural modulus. The amount of ash at the surface of the foamed beads is 3000 wt. ppm or less (including 0). With respect to the foamed beads, in the first DSC curve obtained by heating 1 to 3 mg of polypropylene resin foamed beads from room temperature to 200° C. at a temperature elevation rate of 10° C./min by the use of a differential scanning calorimeter, there appear not only one or more endothermic peak (Pa) having the peak temperature within a temperature zone not higher than the melting point of the resin but also one or more endothermic peak (Pb) having the peak temperature within a temperature zone exceeding the melting point of the resin and not lower than 130° C. The total calorific value of the endothermic peak (Pb) is in the range of 2 to 12 J/g. Further, there is disclosed a foamed bead molded article obtained by molding the above foamed beads.
    • 改进的聚丙烯树脂发泡粒子,不影响特性优异的性能,如压缩性能和耐热性,表征聚丙烯树脂发泡粒子,可以通过在低加热温度下进行的成型提供具有相同性能的聚丙烯树脂发泡粒子模制品。 公开了由熔点为115〜135℃的聚丙烯树脂和500MPa以上的奥氏弯曲弹性模量的聚丙烯树脂发泡粒子。 发泡粒子表面的灰分量为3000重量%。 ppm以下(含0)。 关于发泡粒子,在通过使用差速器以10℃/分钟的升温速度从室温加热1〜3mg聚丙烯树脂发泡粒子至200℃而获得的第一DSC曲线 扫描量热计,不仅存在峰值温度在不高于树脂的熔点的温度区域内的一个或多个吸热峰(Pa),而且还具有在温度区域内具有峰值温度的一个或多个吸热峰(Pb) 超过树脂的熔点并且不低于130℃。吸热峰(Pb)的总热值在2至12J / g的范围内。 此外,公开了通过模制上述发泡颗粒而获得的发泡颗粒模塑制品。