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    • 60. 发明授权
    • Propylene block copolymer, process for preparation thereof and propylene
resin composition comprising same
    • 丙烯嵌段共聚物,其制备方法和包含其的丙烯树脂组合物
    • US5760141A
    • 1998-06-02
    • US672045
    • 1996-06-26
    • Kazuyuki WatanabeHisayoshi Yanagihara
    • Kazuyuki WatanabeHisayoshi Yanagihara
    • C08F297/08C08L53/00C08L23/00C08F210/00
    • C08F297/08C08L53/00
    • A propylene block copolymer, a process for preparation of the propylene block copolymer, and a propylene resin composition comprising the propylene block copolymer. The propylene block copolymer comprises (a) from 35 to 95% by weight of a polypropylene block and (b) from 10 to 65% by weight of a block of a copolymer of a propylene and other .alpha.-olefins, the propylene block copolymer having: (i) in a crystallization temperature curve determined by a differential scanning calorimeter, besides a main peak, secondary peaks in a temperature range of from 90.degree. to 100.degree. C., and a proportion of the area of the secondary peaks to that of a main peak of from 1.5 to 10%; and (ii) a relationship between an amount of a soluble content on xylene extraction at 25.degree. C. and a proportion of the area of the secondary peaks to that of the main peak represented by equation (I): 0.1X.sub.IS -1.ltoreq.SMA (I) wherein X.sub.IS represents an amount of a soluble content on xylene extraction at 25.degree. C. in terms of percent by weight; and SMA represents a proportion of the area of the secondary peaks to that of the main peak in terms of percent.
    • 丙烯嵌段共聚物,丙烯嵌段共聚物的制备方法和包含丙烯嵌段共聚物的丙烯树脂组合物。 丙烯嵌段共聚物包含(a)35至95重量%的聚丙烯嵌段和(b)10至65重量%的丙烯与其它α-烯烃的共聚物嵌段,该丙烯嵌段共聚物具有 :(i)在通过差示扫描量热计测定的结晶温度曲线中,除了主峰之外,在90℃至100℃的温度范围内具有二次峰,并且二次峰的面积与 主峰为1.5%至10%; 和(ii)在25℃下二甲苯萃取的可溶物含量与二级峰面积与式(I)表示的主峰峰面积的比例之间的关系:0.1XIS-1 / = SMA(I)其中XIS表示在25℃下二甲苯提取的可溶性含量的量,以重量百分比计; 而SMA表示次峰的面积与主峰的面积的百分比。