The characteristics of metallocene/Ziegler-Natta hybrid catalysts supported on the recrystallized MgCl2

Thermal Behavior of Polyethylene Reactor Alloys Polymerized by Ziegler–Natta/Late Transition Metal Hybrid Catalyst

“…Results obtained from ICP analysis of the synthesized hybrid catalysts (Table ) show that as the LTM/ZN mixing ratio increased from 0.01 to 0.04 the amount of loaded Fe on the MgCl 2 support (within ZN catalyst) increased from 0.06 to 0.34 and a proportional decrease was detected for Ti from 2.19 to 2.05, respectively. Similar behaviors can be found elsewhere …”

From Multisite Polymerization Catalysis to Sustainable Materials and All-Polyolefin Composites

“…Following the discovery of highly active and stereospecific Lewis-base-modified MgCl 2 -supported TiCl 4 by Montecatini and Mitsui Chemical in 1968, remarkable progress has been made in catalyst and process development, including tailoring of multisite catalysts. Thus, the eco-, resource-, and energy-efficiency of solvent-free polyolefin production have been substantially improved by eliminating numerous process steps such as removal of catalyst residues (deashing), solvent recovery, separation of wax-like byproducts, and even pelletizing extrusion when using particle-forming spherical catalysts. ,, For further improving MWD control and reactor blend formation, conventional supported Ziegler–Natta catalysts are equipped with single-site catalyst components to produce a wide range of Ziegler–Natta hybrid catalysts. ,− Ziegler–Natta hybrid catalysts, in particular, combine the exceptional morphology control typical of spherical MgCl 2 -supported Ziegler–Natta catalysts with the unique control of polyolefin molecular architectures typical of metallocenes . For instance, spherical polypropylene, produced by MgCl 2 , is used as a support for single-site catalysts to produce Ziegler–Natta hybrid catalysts that, in contrast to multisite catalysts, contain just one single-site catalyst component.…”

Poly(amic acid)‐Supported Heterogeneous Titanium‐Based Ziegler‐Natta Catalyst for Ethylene Polymerization in a Slurry Process

“…The melting point ( T m ) of the PE is found to be 133.3–136.7°C (Table V). With the increase in molecular weight of the synthesized PE, the melting point and crystallization temperature ( T c ) also increase 21,31. The high melting point and crystallization temperature indicate the less branched structure of the resulting PE 27,32…”