Combinations of Transition Metal Catalysts for Reactor Blending
The formation of complex polyolefins based materials is described based on the combination of different transition metal catalysts in a single reactor (Reactor Blending). The paper describes how polymer properties can be controlled by selecting different homogeneous and heterogeneous catalyst and combining them in different ratio while at the same time varying polymerization conditions. For clarity sake and rational organization of the many contribution reported in the recent literature, the use of homogeneous and heterogeneous catalysts is discussed in two separate sections. In each of them the processes starting from ethylene and aimed to modulate MWD and chain branching, or propylene aimed to type and distribution of stereoregularity, are also reported in distinct sections.
Key words: Reactor blending, transition metal catalysts, ethylene polymerization, propylene polymerization, stereoblock polypropylene, chain branching, molecular weight distribution.
KeywordsTitanium Nickel Chromium Polyethylene Propylene
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