METALLOCENE CATALYST FOR POLYETHYLENE Russian patent published in 2024 - IPC C07F17/00 C08F4/6592 C08F10/02 

Abstract RU 2824146 C1

FIELD: chemistry.

SUBSTANCE: invention relates to a metallocene compound of formula: (X1)(X2)(X3)(X4)M1. In said formula: M1 is titanium, zirconium or hafnium; X1 is a substituted or unsubstituted fluorenyl ligand, where any substitute is independently selected from C1-C12 hydrocarbyl; X2 is a cyclopentadienyl ligand substituted with C2-C18 heterohydrocarbyl group containing an oxygen atom located at distance of 5 atoms or less from the cyclopentadienyl ligand; X1 and X2 are connected by a bridge group of formula > ER1R2, where E is C or Si, R1 is C1-C12 hydrocarbyl group and R2 is C3-C12 alkenyl group having a terminal C=C double bond; and X3 and X4 are independently selected from a halide. Also disclosed is a catalyst composition containing a metallocene compound and a method for polymerisation of olefins.

EFFECT: catalyst composition containing said metallocene compound enables to obtain polyethylene with a low melt index in the absence of a second metallocene.

27 cl, 3 dwg, 9 tbl

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RU 2 824 146 C1

Authors

Ding, Errun

Yang, Qing

Ash, Carlton E.

Muninger, Randall S.

Askew, Jim B.

Chen, Zhou

Dates

2024-08-06Published

2021-02-18Filed