METHODS AND CATALYST SYSTEMS FOR PRODUCTION OF ISOTACTIC POLYPROPYLENE

    公开(公告)号:US20240199775A1

    公开(公告)日:2024-06-20

    申请号:US18553266

    申请日:2022-03-28

    IPC分类号: C08F210/06

    CPC分类号: C08F210/06

    摘要: Methods of propylene polymerization incorporate bis biphenyl-phenoxy procatalysts favoring polypropylene isotacticity at elevated reactor temperatures. The methods include polymerizing propylene in the presence of a catalyst system to produce a propylene-based polymer. The catalyst system includes a metal-ligand complex selected from bis-biphenyl-phenoxy procatalysts. Polymerization reactions result in polypropylenes having greater than 90% isotacticity, as measured by percentages of isotactic triads, at reaction temperatures from 110° C. to 190 ° C. or from 160 ° C. to 190 ° C.

    APPARATUS AND METHOD FOR GRANULATING LOW VISCOSITY MATERIALS

    公开(公告)号:US20210316481A1

    公开(公告)日:2021-10-14

    申请号:US17272338

    申请日:2019-08-27

    摘要: An apparatus to batch or continuously form solid polymer particles, the apparatus comprising the following components: A) at least one pastillation unit comprising a pastillation head, said unit used to form discrete molten polymer particles from a polymer melt; B) a moving belt to receive and transfer the discrete molten polymer particles from the pastillation head; C) a means to transfer water onto the moving belt, such that the water comes into contact with the discrete molten polymer particles on the moving belt to form the solid polymer particles; and wherein the water of component C is sprayed onto the discrete molten polymer particles, such that the ratio of “the rate of water spray” to “the discharge rate” is ≥3.0; and wherein the belt residence time is ≤50 seconds.

    Adhesive Composition
    36.
    发明申请

    公开(公告)号:US20200317966A1

    公开(公告)日:2020-10-08

    申请号:US16305245

    申请日:2017-06-02

    IPC分类号: C09J123/14 C08L23/14

    摘要: The present disclosure provides a composition. In an embodiment an adhesive composition is provided and includes (A) a propylene-based interpolymer having a density from 0.850 g/cc to 0.900 g/cc; (B) an ethylene-based polymer composition having a melt viscosity at 140° C. from 10 mPa*s to 1,000 mPa*s; and (C) a tackifier. The composition has a molecular weight distribution ratio from 1.00 to 1.40, wherein the molecular weight distribution ratio is the molecular weight distribution of the propylene-based interpolymer of component (A) compared to the molecular weight distribution of the ethylene-based polymer composition of component (B). The composition has a density ratio from 0.93 to 1.30, wherein the density ratio is the density of the propylene-based interpolymer of component (A) compared to the density of the ethylene-based polymer composition of component (B).