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    Ethylene-based polymers with new distributions of terminal and internal unsaturations
    1.
    发明授权
    Ethylene-based polymers with new distributions of terminal and internal unsaturations 有权

    公开(公告)号：US11136419B2

    公开(公告)日：2021-10-05

    申请号：US16634914

    申请日：2018-07-13

    Applicant: Dow Global Technologies LLC

    Inventor： Otto J. Berbee ,  Stefan Hinrichs ,  Bharat I. Chaudhary ,  Teresa P. Karjala ,  John O. Osby ,  Jose Ortega

    IPC: C08F2/01 ,  C08F10/02 ,  C08F210/02 ,  C08F2/38 ,  C08F2/00

    Abstract: A high pressure, free radical polymerization process to form an ethylene-based polymer, the process comprising at least the following step: polymerizing a reaction mixture comprising ethylene, using a polymerization system comprising the following: (A) a reactor configuration comprising at least one reactor that comprises at least two reaction zones, a first reaction zone (reaction zone 1) and an ith reaction zone (where i≥2); wherein the ith reaction zone is the last reaction zone, and wherein i is the total number of reaction zones; (B) at least two ethylene-based feed streams, a first ethylene-based feed stream and an nth ethylene-based feed stream, wherein the first ethylene-based feed stream is sent to the first reaction zone, and the nth ethylene-based feed stream is the last ethylene based feed stream sent to the reactor configuration; wherein n≤i; and RZn/RZ1 does not equal 1.0, where RZ1=mole fraction of make-up ethylene in the first ethylene-based feed stream to the first reaction zone; where RZn=mole fraction of make-up ethylene in the last ethylene-based feed stream sent to the reactor configuration; (C) a control system to control the percentage of the make-up ethylene in the first ethylene-based feed stream, and the percentage of the make-up ethylene in the nth ethylene-based feed stream; and wherein at least one reaction zone receives a CTA make-up feed stream comprising an alpha-olefin, and wherein the alpha-olefin has a chain transfer activity constant (Cs) value ≤0.10, and wherein the chain transfer activity constant (Cs) is measured at 1360 atm, 130° C.

    ETHYLENE-BASED POLYMERS FORMED BY HIGH PRESSURE FREE RADICAL POLYMERIZATIONS
    3.
    发明申请
    ETHYLENE-BASED POLYMERS FORMED BY HIGH PRESSURE FREE RADICAL POLYMERIZATIONS 审中-公开

    公开(公告)号：US20200317826A1

    公开(公告)日：2020-10-08

    申请号：US16303880

    申请日：2017-06-22

    Applicant: Dow Global Technologies LLC

    Inventor： Otto J. Berbee ,  Nhi T. Y. Dang ,  Cornelis J F Hosman ,  Joaquin Flores

    IPC: C08F2/38 ,  B01J8/06 ,  C08F10/02

    Abstract: A process to form an ethylene-based polymer, as described herein, in a tubular reactor system comprising at least three ethylene-based feeds, and at least four reaction zones, and where the weight ratio of “the ethylene-based feed to the second zone (EBF2)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.50 to 1.10; and the weight ratio of “the ethylene-based feed to the third zone (EBF3)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.40 to 2.50; in each zone, the polymerization takes place at a start temperature ≥135° C.; and (a) for three or more ethylene based feeds, the peak temperatures in the first and the second zones, are each from 200° C. to 250° C.; and/or (b) for four or more ethylene based feeds, the peak temperatures in the first, the second and the third zones, are each from 200° C. to 250° C.; and the differential in peak temperatures of the first three zones (TP1, TP2, TP3) meets at least one relationship described herein.

    Polymerization process to make low density polyethylene
    10.
    发明授权
    Polymerization process to make low density polyethylene 有权
    聚合过程制备低密度聚乙烯

    公开(公告)号：US09403928B2

    公开(公告)日：2016-08-02

    申请号：US14262981

    申请日：2014-04-28

    Applicant: Dow Global Technologies LLC

    Inventor： Otto J. Berbee ,  Cornelis Den Doelder ,  Egbert Nijhof ,  Mehmet Demirors ,  Sjoerd A. De Vries

    IPC: C08F220/06 ,  C08F10/02 ,  C08F110/02 ,  C08F210/02 ,  C08F218/08 ,  C08F220/18 ,  C08L23/06 ,  C09D123/06 ,  C08F210/16

    CPC classification number: C08F220/06 ,  C08F10/02 ,  C08F110/02 ,  C08F210/02 ,  C08F210/16 ,  C08F218/08 ,  C08F220/18 ,  C08L23/06 ,  C08L2207/066 ,  C09D123/06 ,  C08F2/00 ,  C08F2500/08 ,  C08F2500/09 ,  C08F2500/12 ,  C08F2500/26 ,  C08F210/06

    Abstract: A high pressure polymerization process to form an ethylene-based polymer comprises the steps of: A. Injecting a first feed comprising ethylene and optionally a chain transfer agent system (CTA system) into a first autoclave reactor zone operating at polymerization conditions to produce a first zone reaction product, the CTA system of the first reactor zone having a transfer activity Z1; and B. (1) Transferring at least part of the first zone reaction product to a second reactor zone selected from a second autoclave reactor zone or a tubular reactor zone and operating at polymerization conditions, and, optionally, (2) freshly injecting a second feed into the second reactor zone to produce a second zone reaction product, with the proviso that the second reactor zone contains a CTA system having a transfer activity Z2; and with the proviso that the ratio of Z1/Z2 is less than 1.

    Abstract translation: 形成乙烯基聚合物的高压聚合方法包括以下步骤：A.将包含乙烯和任选的链转移剂体系（CTA体系）的第一种进料注入到在聚合条件下操作的第一高压釜反应器区中，以产生第一 区域反应产物，具有转移活性Z1的第一反应器区域的CTA体系; （1）将至少部分第一区反应产物转移到选自第二高压釜反应器区或管状反应器区并在聚合条件下操作的第二反应器区，以及任选地，（2）新鲜地注入第二个 进料到第二反应器区以产生第二区反应产物，条件是第二反应器区含有具有转移活性Z 2的CTA体系; 并且条件是Z1 / Z2的比率小于1。

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