申请人:Japan Polyolefins Co., Ltd.
公开号:EP0854155A1
公开(公告)日:1998-07-22
A highly crystalline polypropylene having a degree of crystallinity of at least 50.5% calculated from the heat of melting; and a relationship between a proportion f(R)of R-lamella with respect to spherulites and a weight-average molecular weight Mw which satisfies the following Formula (II). The above-mentioned proportion f(R) of R-lamella spherulites is calculated using the following Formula (I) from the birefringence Δn of crystallized spherulites obtained by melting said highly crystalline polypropylene at 230°C for 5 minutes, cooling to a temperature of 132°C at a cooling rate of 20°C/minute, and then maintaining said temperature for 90 minutes. Molded articles obtained using the above-mentioned highly crystalline polypropylene or a resin composition containing the above-mentioned highly crystalline polypropylene resin are superior in rigidity, heat resistance, scratch resistance, dimensional stability, and low production of odor during molding, and can be widely used in various applications.Formula (I)f(R) = ( - Δn + 0.0351) X 100/0.0528Formula (II).f(R) > - 2.5 X (logMw} -4)2 + 88.9
一种高结晶聚丙烯,其结晶度根据熔化热计算至少为 50.5%;以及 R-拉美球粒比例 f(R)与重量平均分子量 Mw 之间的关系满足下式 (II)。上述 R-拉美拉球状物比例 f(R)是通过下式(I)从结晶球状物的双折射 Δn 计算得出的,结晶球状物是通过在 230°C 下熔化所述高结晶聚丙烯 5 分钟,以 20°C / 分钟的冷却速度冷却到 132°C 的温度,然后保持所述温度 90 分钟而得到的。使用上述高结晶性聚丙烯或含有上述高结晶性聚丙烯树脂的树脂组合物获得的模塑制品在刚性、耐热性、抗划伤性、尺寸稳定性和模塑过程中产生的气味低等方面均具有优越性,可广泛应用于各种领域。