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    Ethylene-based polymers with low hexane extractables and low densities
    41.
    发明授权
    Ethylene-based polymers with low hexane extractables and low densities 有权

    公开(公告)号：US10730973B2

    公开(公告)日：2020-08-04

    申请号：US15737474

    申请日：2016-06-16

    Applicant: Dow Global Technologies LLC

    Inventor： Otto J. Berbee ,  Cornelis F. J. Den Doelder ,  Stefan Hinrichs ,  Teresa P. Karjala ,  John O. Osby

    IPC: C08F110/02 ,  C08F2/38 ,  C08F4/38

    Abstract: Ethylene-based polymers comprising the following properties: (A) a density less than 0.9190 g/cc; (B) a hexane extractable level that meets the following equation: hexane extractable level ≤A+B [log(12)], where A=2.65 wt %, and B—0.25 wt %[log (dg/min)]; based on total weight of the ethylene-based polymer; (C) a G′ (at G″=500 Pa, 1 70° C.) that meets the following equation: G′≥C+D [log(12)], where C=150 Pa, and D=−60 Pa/[log(dg/min)]; and (D) a melt index (12) from 0.7 to 20 dg/min; are made in high pressure tubular process that comprises at least three reaction zones with the peak polymerization temperature of the first reaction zone ≥320° C. and the peak polymerization temperature of the last reaction zone ≤290° C.

    HIGH PRESSURE FREE RADICAL POLYMERIZATIONS
    45.
    发明申请
    HIGH PRESSURE FREE RADICAL POLYMERIZATIONS 审中-公开

    公开(公告)号：US20180305475A1

    公开(公告)日：2018-10-25

    申请号：US15769285

    申请日：2016-11-10

    Applicant: Dow Global Technologies LLC

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

    IPC: C08F10/02

    Abstract: A process is provided to form an ethylene-based polymer, in the presence of at least one free-radical, said process comprises at least the following: polymerizing a mixture comprising ethylene, in a reactor configuration comprising at least three reaction zones, and comprising two ethylene feed streams, and wherein the ratio (RLCBf40%), in percent, of the “LCB content of the first 40 wt % of the total polymer formed” to “the total LCB content in the final polymer” is ≤22.5%; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone, is from 40 mole % to 80 mole %, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization.

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