公开(公告)号：US20240209124A1

公开(公告)日：2024-06-27

申请号：US18557110

申请日：2022-04-25

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Diwaker SINGH ,  Richard B. PANNELL ,  Timothy M. BOLLER ,  Gerardo CORONA ,  Fred D. EHRMAN ,  Charles J. HARLAN ,  Yan JIANG ,  Chi-l KUO ,  William A. LAMBERTI ,  Sateesh K. RAJPUT ,  Shayan KARIMIPOUR

IPC: C08F2/34

CPC classification number: C08F2/34 ,  C08F2410/02 ,  C08F2410/05 ,  C08F2410/08

Abstract: Processes for transitioning from a first catalyst to a second catalyst in a gas phase polymerization reactor. In some embodiments, the processes relate to transitioning from a metallocene catalyst to a Ziegler-Natta catalyst. In other embodiments, the processes relate to transitioning from a first Ziegler-Natta catalyst to a second Ziegler-Natta catalyst.

公开(公告)号：US20230406973A1

公开(公告)日：2023-12-21

申请号：US18250309

申请日：2021-12-01

Applicant: Exxonmobil Chemical Patents Inc.

Inventor： Nino RUOCCO ,  Nilesh SAVARGAONKAR ,  Timothy M. BOLLER ,  Etienne R.H. LERNOUX ,  Robert M. CANRIGHT

IPC: C08F210/16

CPC classification number: C08F210/16

Abstract: Provided herein are polyethylene compositions having a combination of properties including: density from about 0.930 to 0.975 g/cm3; broad molecular weight distributions (Mw/Mn≥10 and/or Mz/Mn≥80) and a highly branched architecture (e.g., g′LCB less than or equal to 0.85, preferably less than or equal to 0.75). The polyethylene compositions may further have a low molecular weight fraction (LMWF) and a high molecular weight fraction (HMWF), such that the wt % of LMWF in the compositions is greater than the wt % of HMWF. The polyethylene compositions may be suitable for making films, particularly oriented films such as uni axially (machine-direction-oriented) or biaxially-oriented films, and in particular all-PE films.

公开(公告)号：US20230322972A1

公开(公告)日：2023-10-12

申请号：US18043088

申请日：2021-09-29

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Matthew W. HOLTCAMP ,  Laughlin G. MCCULLOUGH ,  Kevin A. STEVENS ,  Dongming LI ,  Robert L. HALBACH ,  Ramyaa MATHIALAGAN ,  Charles J. HARLAN ,  Timothy M. BOLLER

IPC: C08F4/76 ,  C08F4/02 ,  C08F4/80 ,  C08F210/16 ,  C08F2/34

CPC classification number: C08F4/76 ,  C08F4/025 ,  C08F4/80 ,  C08F210/16 ,  C08F2/34 ,  C08F2410/06 ,  C08F2420/08

Abstract: This invention relates to a supported catalyst system comprising: (i) at least one first catalyst component comprising a group 4 metallocycle containing metallocene complex; (ii) at least one second catalyst component comprising a 2,6-bis(imino)pyridyl iron complex; (iii) activator; and (iv) support. The catalyst system may be used for preparing polyolefins, such a bimodal polyethylene, typically in a gas phase polymerization.