Back to results
US 6,583,240 B2Granted
Ethylene polymerization process
AssigneeEquistar Chemicals, LP
InventorsShaotian Wang, Jean A. Merrick-Mack
Life of this patent
Estimating the term…
Abstract
An ethylene polymerization process is disclosed. The polyethylene has a long-chain-branching index (LCBI) of 1 or greaster. The process uses a single-site catalyst that contains a boraaryl ligand. The catalyst is alkylated with triisobutyl aluminum.
Claims13
A process that comprises polymerizing ethylene or a mixture of ethylene and up to 10 wt % of a C3-C10 α-olefin in the presence of an activator and a Group 4 metal catalyst having at least one boraaryl ligand;
- wherein the catalyst is alkylated for at least 10 minutes before use in polymerization with triisobutyl aluminum;
- and
- wherein the polyethylene produced has a long-chain-branching index (LCBI) of 1 or greater.
Dependencies are inferred from the claim text.