Single-site catalysts in the industrial production of polyethylene

Abstract

This review generalizes the data on the application of single site catalysts (SSCs) in the industrial production of polyethylene. The history of their industrial application, the basic types of SSCs, the main pro cesses of the production of polyethylene (PE) on the mentioned systems, the largest PE production plants using SSCs, and the application fields of polymers synthesized at these plants are described. The prospects for further development in this direction are discussed.

Metallocene Polyethylene Wax Synthesis

“…7−9 In addition, the single-site nature of metallocene catalysts usually results in polymers with unimodal molecular weight distributions. 10 Variation of the ancillary cyclopentadienyl ligands of Cp 2 MX 2 species can influence polymerization activity and polymer properties. We recently reported a new family of unsymmetrical ansa-bridged zirconocenes based on the permethylindenyl ligand (C 9 Me 7 − , Ind*, I*) as catalysts for ethylene and lactide polymerization (Chart 1).…”

Slurry-phase ethylene polymerisation using group 4 ansa-bridged permethylindenyl complexes supported on polymethylaluminoxane

“…Metallocene catalysts provide a multitude of possibilities for synthesising and controlling the structure and properties of polymers. [1][2][3] The single-site nature of metallocene catalysts leads to the formation of polymers with unimodal molecular weight distributions, [4] while ansa-bridges between the two cyclopentadienyl substituents can be employed to prevent ligand rotation and enforce complex rigidity. [5] Single atom silicon or carbon, and two atom carbon bridged metallocenes have been widely explored as catalysts for olefin polymerisation.…”

Ethylene Polymerization Using Zirconocenes Supported on Pentafluorophenyl-Modified Solid Polymethylaluminoxane

“…Metallocene catalysts provide a multitude of possibilities for synthesising and controlling the structure and properties of polymers. [1][2][3] The single-site nature of metallocene catalysts leads to the formation of polymers with unimodal molecular weight distributions, [4] while ansa-bridges between the two cyclopentadienyl substituents can be employed to prevent ligand rotation and enforce complex rigidity. [5] Single atom silicon or carbon, and two atom carbon bridged metallocenes have been widely explored as catalysts for olefin polymerisation.…”