中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

18 records (took 0.018 seconds)

    Ethylene-a-olefin-diene Elastomers and Methods of Making Them
    3.
    发明申请
    Ethylene-a-olefin-diene Elastomers and Methods of Making Them 有权

    公开(公告)号：US20210269567A1

    公开(公告)日：2021-09-02

    申请号：US17324326

    申请日：2021-05-19

    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 ,  B01J31/18 ,  C08F4/64 ,  C08F236/20

    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′avgg) of 0.9 or more, and a branching index at very high Mw (g′1000) of less than 0.9.

    Preparation of bimodal rubber, thermoplastic vulcanizates, and articles made therefrom
    7.
    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.

    Compatibilized Thermoplastic Vulcanizate Compositions
    8.
    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.

Patent Agency Ranking