公开(公告)号：US20230118464A1

公开(公告)日：2023-04-20

申请号：US17905222

申请日：2021-03-15

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Shanshan Zhang ,  Peijun Jiang ,  Ying Ying Sun ,  Yujie Sheng ,  Saifudin M. Abubakar ,  Guangdi Chen ,  Hongchao Wang

IPC: C08F293/00 ,  C08L53/00

Abstract: The present disclosure relates to comb-block copolymers and methods thereof. In some embodiments, a copolymer includes a first block comprising an ethylene-propylene copolymer; and a second block comprising a high density polyethylene. In some embodiments, a polyethylene composition includes the copolymer and a branched vinyl/vinylidene-terminated high density polyethylene. In some embodiments, a process for producing a polyethylene composition includes polymerizing ethylene, at a temperature of at least 100° C., by introducing the ethylene to a first catalyst system having a first catalyst compound and a first activator to form a branched vinyl/vinylidene-terminated high density polyethylene. The process includes introducing the branched vinyl/vinylidene-terminated high density polyethylene to additional ethylene, propylene, and a second catalyst system having a second catalyst compound and a second activator. The process includes obtaining the polyethylene composition.