Ethylene polymerization process
 A gas phase copolymerization of ethylene is disclosed. The process uses a supported single-site catalyst that contains a heteroatomic ligand and produces polyethylene that has a reduced density. Suitable heteroatomic ligands include boraaryl, azaborolinyl, pyridinyl, pyrrolyl, indolyl, carbazolyl and quinolinyl. 
Equistar Chemicals, L.P.
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Jia-Chu Mark P. Shaotian Clifford C.
Liu Mack Wang Lee