Solution Polymerization Process for Making High-Density Polyethylene with Long-Chain Branching
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United States of America Patent
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Jan 5, 2023
app pub date -
Nov 17, 2020
filing date -
Nov 17, 2020
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Abstract
A polymerization process includes contacting an ethylene feed containing ethylene monomers with a catalyst feed containing a hafnium-based or zirconium-based single-site catalyst in a solution so as to polymerize the ethylene monomers into long-chain branched high density polyethylene having on average a long-chain branch/polymer chain less than 10 and greater than 0.25. A polymerization composition includes ethylene; a hafnium-based or zirconium-based single-site catalyst; and a long-chain branched high density polyethylene polymerization product, where the long-chain branched high density polyethylene has on average a long-chain branch/polymer chain less than 10 and greater than 0.25; and where at least one of the ethylene, the catalyst, and the product is in solution.
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