公开(公告)号：US20160115266A1

公开(公告)日：2016-04-28

申请号：US14897150

申请日：2014-06-09

Applicant: BOREALIS AG

Inventor： Wilfred Töltsch ,  Luigi Resconi ,  Kristin Reichelt

IPC: C08F210/16

CPC classification number: C08F210/16 ,  C08F2/001 ,  C08F4/65912 ,  C08F4/70 ,  C08F2410/01 ,  C08L23/12 ,  C08F10/06 ,  C08F4/6492 ,  C08F4/65927 ,  C08F210/06 ,  C08F2500/05 ,  C08F2500/17 ,  C08L23/16

Abstract: A process for the preparation of a propylene polymer in a multistage polymerisation process in the presence of a single site catalyst, said process comprising: (I) in a prepolymerisation step prepolymerising a single site catalyst in the presence of propylene and optionally at least one C2-10 alpha olefin comonomer and in the presence of hydrogen or in the absence of hydrogen; (II) in a slurry polymerisation step, polymerising propylene and optionally at least one C2-10 alpha olefin comonomer, with the pre-polymerised catalyst of step (I) in the presence of hydrogen; and subsequently (III) in a gas polymerisation step polymerising propylene and optionally at least one C2-10 alpha olefin comonomer, in the presence of catalyst and polymer from step (II) and optionally in the presence of hydrogen so as to form a propylene homopolymer or copolymer; wherein the amount of hydrogen fed to the pre-polymerisation step (I) is at most 15% of the total amount of hydrogen fed to steps (I) and (II) of the polymerisation process.

Abstract translation: 一种在多段聚合方法中在单中心催化剂存在下制备丙烯聚合物的方法，所述方法包括：（I）在预聚合步骤中，在丙烯和任选的至少一个C 2的存在下预聚合单中心催化剂 -10α-烯烃共聚单体，并且在氢存在下或在不存在氢的情况下; （II）在淤浆聚合步骤中，将聚合丙烯和任选的至少一种C 2-10α-烯烃共聚单体与步骤（I）的预聚合催化剂在氢气存在下聚合; 和随后（III）在气相聚合步骤中聚合丙烯和任选的至少一种C 2-10α-烯烃共聚单体，在步骤（II）的催化剂和聚合物存在下，任选地在氢的存在下，形成丙烯均聚物 或共聚物; 其中进料到预聚合步骤（I）中的氢的量为进料到聚合方法的步骤（I）和（II）的氢的总量的至多15％。