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    Ethylene-a-olefin-diene elastomers and methods of making them
    12.
    发明授权
    Ethylene-a-olefin-diene elastomers and methods of making them 有权

    公开(公告)号：US11041034B2

    公开(公告)日：2021-06-22

    申请号：US16250710

    申请日：2019-01-17

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Crisita Carmen H. Atienza ,  Rhutesh K. Shah ,  Ron Walker ,  John R. Hagadorn ,  Sudhin Datta

    IPC: C08F210/16 ,  C08F210/02 ,  C08F210/06 ,  C08F236/04 ,  C08F236/20 ,  C08F4/64 ,  B01J31/18

    Abstract: A process to produce a branched ethylene-α-olefin diene elastomer comprising combining a catalyst precursor and an activator with a feed comprising ethylene, C3 to C12 α-olefins, and a dual-polymerizable diene to obtain a branched ethylene-α-olefin diene elastomer; where the catalyst precursor is selected from pyridyldiamide and quinolinyldiamido transition metal complexes. The branched ethylene-α-olefin diene elastomer may comprise within a range from 40 to 80 wt % of ethylene-derived units by weight of the branched ethylene-α-olefin diene elastomer, and 0.1 to 2 wt % of singly-polymerizable diene derived units, 0.1 to 2 wt % of singly-polymerizable diene derived units, and the remainder comprising C3 to C12 α-olefin derived units, wherein the branched ethylene-α-olefin diene elastomer has a weight average molecular weight (Mw) within a range from 100 kg/mole to 300 kg/mole, an average branching index (g′avg) of 0.9 or more, and a branching index at very high Mw (g′1000) of less than 0.9.

    Compatibilized thermoplastic vulcanizate compositions
    13.
    发明授权
    Compatibilized thermoplastic vulcanizate compositions 有权

    公开(公告)号：US11142605B2

    公开(公告)日：2021-10-12

    申请号：US16356844

    申请日：2019-03-18

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Sudhin Datta ,  Andy H. Tsou ,  Ron Walker ,  Hillary L. Passino

    IPC: C08L23/16 ,  C08F236/04 ,  C08F210/06 ,  C08F210/02 ,  C08L23/14 ,  C08F236/20 ,  C08F210/18 ,  C08J3/21 ,  C08J3/24

    Abstract: Disclosed is the preparation of compatibilized thermoplastic vulcanizates with reduced crosslinked rubber dispersion sizes and dispersity. A cross-linkable ethylene-propylene-diene terpolymer with majority propylene (PEDM) is used to compatibilize a plastic and rubber blend of a polypropylene (PP) and an ethylene-propylene-diene terpolymer rubber, where the propylene content is less than 50 wt % (EPDM), in dynamic vulcanization and preparation of PP/EPDM thermoplastic vulcanizates. The resulting PP/EPDM thermoplastic vulcanizates typically exhibit a weight average equivalent dispersion diameter of less than 3 microns and a particle size polydispersity index (PSDI), or weight average over number average dispersion diameter, of less than 5. This reduction in crosslinked rubber dispersion size in a PP/EPDM TPV by using PEDM compatibilizers enhances the toughness of the vulcanizate product by raising both elongation to break and break stress.

    PREPARATION OF BIMODAL RUBBER, THERMOPLASTIC VULCANIZATES, AND ARTICLES MADE THEREFROM
    16.
    发明申请
    PREPARATION OF BIMODAL RUBBER, THERMOPLASTIC VULCANIZATES, AND ARTICLES MADE THEREFROM 审中-公开

    公开(公告)号：US20200024436A1

    公开(公告)日：2020-01-23

    申请号：US16460260

    申请日：2019-07-02

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Andy H. Tsou ,  John R. Hagadorn ,  Jian Yang ,  Ron Walker ,  Sudhin Datta

    IPC: C08L23/16 ,  C08F210/18 ,  C08J3/12

    Abstract: Pellet-stable olefinic copolymer bimodal rubber is made using parallel reactors, with one reactor synthesizing higher molecular weight (MW) rubber with dual catalysts, with an improved molecular weight split ratio and an improved composition distribution of the moderate and ultra-high MW components, while another reactor synthesizes random isotactic polypropylene copolymer (RCP). The effluents are reactor-blended and result in pellet-stable bimodal rubber (P-SBR), which may be pelletized. When making thermoplastic vulcanizates (TPVs) with P-SBR, the need to granulate rubber bales and subsequently use talc, clay, or other anti-agglomeration agents to prevent granulated rubber crumbs from agglomerating are eliminated. TPVs made with P-SBR have vulcanized rubber particles that are smaller and more uniform in size, resulting in TPVs with higher particle counts and more thermoplastic “ligaments” between the particles, with such ligaments being made stronger by the added RCP. Such thus-produced TPVs have a lower hysteresis and flexural modulus, and better elastic properties.

    Crosslinked Rubber Dispersion in Thermoplastic Vulcanizates
    17.
    发明申请
    Crosslinked Rubber Dispersion in Thermoplastic Vulcanizates 审中-公开

    公开(公告)号：US20190309154A1

    公开(公告)日：2019-10-10

    申请号：US16375501

    申请日：2019-04-04

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Sudhin Datta ,  Andy H. Tsou ,  Ron Walker ,  Bethany M. Welke

    IPC: C08L23/16 ,  C08J3/20 ,  C08J3/24

    Abstract: Use of twin screw extrusion to further enhance the uniformity of crosslinked rubber dispersion in thermoplastic vulcanizates (TPVs) to improve elastic properties of TPVs is disclosed. Most specifically, this invention employs intermeshing twin screw extruders to further homogenize dynamically vulcanized rubber dispersions in TPVs so that their particle size dispersion index (PSDI), or the ratio of weight average equivalent dispersion particle diameter to number average equivalent dispersion particle diameter, can be lowered to less than 1.6 or 1.57 with corresponding elastic property improvements by having lower hysteresis, higher elongation to break, and higher retractive force. TPV products having lower PSDI and improved elastic properties, and apparatus for conducting the disclosed method, are also provided.

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