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    • 3. 发明授权
    • Process for producing propylene-ethylene block copolymers
    • 制备丙烯 - 乙烯嵌段共聚物的方法
    • US4254237A
    • 1981-03-03
    • US30523
    • 1979-04-16
    • Akinobu ShigaMasahiro KakugoHajime SadatoshiKazuki WakamatsuHiroshi Yoshioka
    • Akinobu ShigaMasahiro KakugoHajime SadatoshiKazuki WakamatsuHiroshi Yoshioka
    • C08F297/00C08F297/08
    • C08F297/086
    • A process for producing propylene-ethylene block copolymers by a three-step polymerization technique using a stereoregular catalyst, characterized in that the first-step polymerization is carried out by supplying propylene alone or a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 6/94 or less, thereby polymerizing 60 to 95% by weight of the total polymerization amount, the second-step polymerization is carried out by supplying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 15/85 to 79/21, thereby polymerizing 1 to 20% by weight of the total polymerization amount, and the third-step polymerization is carried out by supplying a propylene/ethylene mixture so that the ethylene/propylene reaction ratio is 50/50 to 89/11, thereby polymerizing 4 to 35% by weight of the total polymerization amount, with the ethylene/propylene reaction ratio in the third step made larger than that in the second step. Said process can give propylene-ethylene block copolymers markedly well balanced in impact strength, stiffness, transparency and impact blushing.
    • 一种通过使用立体规则催化剂的三步聚合技术制备丙烯 - 乙烯嵌段共聚物的方法,其特征在于第一步聚合是通过仅供应丙烯或丙烯/乙烯混合物进行的,以使乙烯/丙烯反应比 为6/94以下,由此聚合60〜95重量%的总聚合量,第二步聚合是通过供给丙烯/乙烯混合物进行的,以使乙烯/丙烯反应比为15/85〜79 / 21,由此聚合1至20重量%的总聚合量,第三步聚合通过供应丙烯/乙烯混合物进行,使得乙烯/丙烯反应比为50/50至89/11, 从而聚合4〜35重量%的总聚合量,第3步骤中的乙烯/丙烯反应比例大于第2步骤。 所述方法可以使丙烯 - 乙烯嵌段共聚物在冲击强度,刚度,透明度和冲击冲刷中显着地平衡。
    • 4. 发明授权
    • Process for producing propylene-ethylene block copolymers
    • 制备丙烯 - 乙烯嵌段共聚物的方法
    • US4337326A
    • 1982-06-29
    • US194954
    • 1980-10-08
    • Akinobu ShigaMasahiro KakugoHajime SadatoshiKazuki WakamatsuHiroshi Yoshioka
    • Akinobu ShigaMasahiro KakugoHajime SadatoshiKazuki WakamatsuHiroshi Yoshioka
    • C08F2/00C08F297/00C08F297/08
    • C08F297/086
    • A process for producing a propylene-ethylene block copolymer by subjecting propylene and ethylene to three-step polymerization using a stereoregular polymerization catalyst, which comprises in the first step polymerizing propylene alone or a propylene/ethylene mixture so that the average ethylene/propylene reaction ratio is 6/94 or less, thereby polymerizing 60 to 95% by weight of the total polymerization amount, in the second step polymerizing a propylene/ethylene mixture so that the average ethylene/propylene reaction ratio is 25/75 to 67/33, thereby polymerizing 1 to 20% by weight of the total polymerization amount, and in the third step polymerizing a propylene/ethylene mixture so that the average ethylene/propylene reaction ratio is 76/24 to 89/11, thereby polymerizing 4 to 35% by weight of the total polymerization amount, wherein in the second and third steps, ethylene alone is supplied thereby gradually decreasing the amount of propylene in the polymerization system from the first step to the succeeding steps.
    • 丙烯 - 乙烯嵌段共聚物的制备方法是使用立体规则聚合催化剂对丙烯和乙烯进行三步聚合,其中包括在第一步中聚合单独的丙烯或丙烯/乙烯混合物,使得平均乙烯/丙烯反应比 为6/94以下,由此聚合60〜95重量%的总聚合量,在丙烯/乙烯混合物的聚合中,平均乙烯/丙烯的反应比为25/75〜67/33, 聚合1至20重量%的总聚合量,并且在第三步中聚合丙烯/乙烯混合物使得平均乙烯/丙烯反应比为76/24至89/11,从而聚合4至35重量% 的总聚合量,其中在第二和第三步骤中,仅供应乙烯,从而逐渐降低聚合体系中丙烯的量 迈向后续步骤。