Ethylene polymerization process

Details Ethylene polymerization process Ethylene polymerization process

C - Chemistry, Metallurgy

08

F

C08F 10/02 (2006.01) B01J 31/02 (2006.01) B01J 31/14 (2006.01) B01J 31/22 (2006.01) B01J 37/02 (2006.01) C07F 17/00 (2006.01) C08F 110/02 (2006.01) B01J 21/08 (2006.01) B01J 31/38 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2441617

An ethylene polymerization process is disclosed. The process uses a single- site catalyst that contains a boraaryl ligand. It comprises supporting the catalyst, forming a slurry of the supported catalyst in an organic solvent, mixing the catalyst slurry with trialkyl aluminum compound, and polymerizing ethylene in the presence of the trialkyl aluminum-treated catalyst slurry. The process gives polyethylene having a controlled long-chain-branch index.

L'invention concerne un procédé de polymérisation d'éthylène. Ce procédé fait intervenir un catalyseur monosite renfermant un ligand boraaryle. Ce procédé consiste à supporter le catalyseur, à former une suspension à partir du catalyseur supporté dans un solvant organique, à mélanger la suspension catalytique au trialkylaluminium, et enfin, à polymériser l'éthylène en présence de la suspension catalytique traitée au trialkylaluminium. Ce procédé permet d'obtenir du polyéthylène ayant un indice contrôlé de ramification à longue chaîne.

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