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    Sequential, double elastomer vulcanization system, method and composition
    33.
    发明授权
    Sequential, double elastomer vulcanization system, method and composition 有权

    公开(公告)号：US11674024B2

    公开(公告)日：2023-06-13

    申请号：US17315907

    申请日：2021-05-10

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Shushuang Li ,  Sudhin Datta

    IPC: C08L23/08 ,  C08L23/16 ,  C08L9/00 ,  C08J3/24

    CPC classification number: C08L23/0815 ,  C08J3/243 ,  C08J3/245 ,  C08L23/16 ,  C08F2810/20 ,  C08L9/00 ,  C08L2205/03

    Abstract: Sequential, double elastomer vulcanization method, system, and composition. First and second immiscible elastomers are mixed together with a first additive package. A first curative system is activated to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase. Then, a second curative system is activated to vulcanize the second elastomer in the continuous phase. Since the partially vulcanized mixture is melt processable, a second additive package can be introduced to the mixture after activating the first curative system. Or, the second curative system can be activatable at a temperature which is higher than an activation temperature of the first curative system. In this manner, blends of dissimilar elastomers can be vulcanized with independent control of plasticizer, filler and curative distribution.

    Preparation of bimodal rubber, thermoplastic vulcanizates, and articles made therefrom
    34.
    发明授权
    Preparation of bimodal rubber, thermoplastic vulcanizates, and articles made therefrom 有权

    公开(公告)号：US11466149B2

    公开(公告)日：2022-10-11

    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 ,  B29K23/00 ,  B29B9/06

    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.

    Thermoplastic polyolefin containing amorphous ethylene elastomer
    36.
    发明授权
    Thermoplastic polyolefin containing amorphous ethylene elastomer 有权

    公开(公告)号：US11104784B2

    公开(公告)日：2021-08-31

    申请号：US16793075

    申请日：2020-02-18

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Sudhin Datta ,  Xin Chen ,  Abdul M. Jangda ,  Rohan A. Hule ,  Jan Kalfus

    IPC: C08L23/14 ,  C08L23/12

    Abstract: Disclosed is a thermoplastic polyolefin composition useful in automotive components comprising at least a polypropylene having a melting point temperature (Tm) of greater than 130° C. and a melt flow rate (230° C./2.16 kg) within the range from 10 g/10 min to 80 g/10 min; an amorphous ethylene-propylene copolymer comprising within the range from 40 wt % to 80 wt % ethylene derived units and having a melt flow rate (230° C./2.16 kg) within the range from 0.1 g/10 min to 20 g/10 min; and a propylene-based elastomer having within the range from 5 to 25 wt % ethylene derived units and having a Tm of less than 110° C. The composition only partially breaks or there is no break at −29° C. (ASTM D256) with Notched Izod Force of between 10 to 40 ft-lb/in2 at 22° C. (533 to 2,132 J/m2), and between 1.0 to 12 ft-lb/in2 at −29° C. (53 to 636 J/m2).

    Thermoplastic polyolefin compositions with ethylene-propylene copolymers
    37.
    发明授权
    Thermoplastic polyolefin compositions with ethylene-propylene copolymers 有权

    公开(公告)号：US10822481B2

    公开(公告)日：2020-11-03

    申请号：US15724401

    申请日：2017-10-04

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Xin Chen ,  Sudhin Datta

    IPC: C08L23/12

    Abstract: This invention relates to a thermoplastic polyolefin composition with (a) 45 wt % to 70 wt % of a polypropylene having 70 wt % or more units derived from propylene, having a melting point temperature of greater than 130° C. and a melt flow rate from 2 to 80 g/10 min; (b) 20 wt % to 30 wt % of a bimodal ethylene-propylene copolymer comprising: (i) 80 wt % to 90 wt % of an amorphous ethylene-propylene copolymer having about 30 wt % or more units derived from ethylene; (ii) 5 wt % to 15 wt % of a semi-crystalline ethylene-propylene copolymer having 70 wt % or more units derived from ethylene; and (iii) 1 wt % to 5 wt % of a propylene-based elastomer having within the range from 5 wt % to 25 wt % ethylene derived units and having a melting point temperature of less than 110° C. and a Mw/Mn within the range from 2.0 to 4.0.

    Bimodal polypropylenes and method of making same
    38.
    发明授权
    Bimodal polypropylenes and method of making same 有权

    公开(公告)号：US10766981B2

    公开(公告)日：2020-09-08

    申请号：US15746965

    申请日：2015-08-04

    Applicant: ExxonMobil Chemical Patents Inc.

    Inventor： Rohan A. Hule ,  Sudhin Datta ,  Yi Ping Ni

    IPC: C08F110/06 ,  C08L23/12

    Abstract: Bimodal polypropylene compositions and a process to form melt blended bimodal polypropylene compositions comprising combining at least two polypropylenes in at least a two-pass process, and forming a bimodal polypropylene composition having a Flexural Modulus (190° C., 1% secant) of at least 1700 MPa, as well as one or more other selected properties. These compositions are suitable for thermoformed articles and injection molded articles, any of which may be foamed.

    Compatibilized Thermoplastic Vulcanizate Compositions
    40.
    发明申请
    Compatibilized Thermoplastic Vulcanizate Compositions 审中-公开

    公开(公告)号：US20190309151A1

    公开(公告)日：2019-10-10

    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 ,  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.

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