公开(公告)号：US11325995B2

公开(公告)日：2022-05-10

申请号：US16797875

申请日：2020-02-21

Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

Inventor： Errun Ding ,  Qing Yang ,  Carlton E. Ash ,  Randall S. Muninger ,  Jim B. Askew ,  Zhou Chen

IPC: C07F17/00 ,  C08F4/6592 ,  C08F210/16 ,  C08F10/02

Abstract: Disclosed are metallocene compounds, catalyst compositions comprising a metallocene compound, processes for polymerizing olefins, methods for making catalyst compositions, olefin polymers and articles made from olefin polymers. In an aspect, a metallocene compounds contain a fluorenyl ligand and a cyclopentadienyl ligand which are bridged by a linking group, in which the metallocene is characterized by [1] the cyclopentadienyl ligand being substituted with a C2-C18 heterohydrocarbyl group having an oxygen atom positioned 5 atoms distance or less from the cyclopentadienyl ligand and [2] the linking group having a pendant C3-C12 alkenyl group having a terminal C═C double bond. It has been discovered that a catalyst composition comprising a metallocene compound having these features can produce polyethylene having a low melt index in the absence of a second metallocene.

公开(公告)号：US20210261697A1

公开(公告)日：2021-08-26

申请号：US16797875

申请日：2020-02-21

Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

Inventor： Errun Ding ,  Qing Yang ,  Carlton E. Ash ,  Randall S. Muninger ,  Jim B. Askew ,  Zhou Chen

IPC: C08F4/6592 ,  C08F10/02

Abstract: Disclosed are metallocene compounds, catalyst compositions comprising a metallocene compound, processes for polymerizing olefins, methods for making catalyst compositions, olefin polymers and articles made from olefin polymers. In an aspect, a metallocene compounds contain a fluorenyl ligand and a cyclopentadienyl ligand which are bridged by a linking group, in which the metallocene is characterized by [1] the cyclopentadienyl ligand being substituted with a C2-C18 heterohydrocarbyl group having an oxygen atom positioned 5 atoms distance or less from the cyclopentadienyl ligand and [2] the linking group having a pendant C3-C12 alkenyl group having a terminal C═C double bond. It has been discovered that a catalyst composition comprising a metallocene compound having these features can produce polyethylene having a low melt index in the absence of a second metallocene.

公开(公告)号：US20240301099A1

公开(公告)日：2024-09-12

申请号：US18598080

申请日：2024-03-07

Applicant: Chevron Phillips Chemical Company LP

Inventor： Zhou Chen ,  Richard M. Buck ,  Jon D. Ratzlaff ,  Jeffrey S. Fodor ,  Jim B. Askew

IPC: C08F10/02

CPC classification number: C08F10/02

Abstract: Ethylene-based polymers having a melt index from 0.8 to 8 g/10 min, a density from 0.94 to 0.96 g/cm3, and a ratio of Mw/Mn from 6 to 20 are disclosed. These polymers can have one or more of an environmental stress crack resistance (ESCR) of at least 5,000 hr (condition A, 100% Igepal), an ESCR of at least 2,500 hr (condition A, 10% Igepal), a CY-a parameter from 0.35 to 0.53, a PSP2 value from 5 to 8.5, a tan δ at 0.1 sec−1 from 8 to 24 degrees, a Mz from 275,000 to 420,000 g/mol, an IVc from 2 to 3 dL/g, a strain hardening modulus (SHM) from 19 to 47 MPa, and/or an amount of polymer eluting between 93 and 95° C. in an ATREF profile of from 7 to 30 wt. %.