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Control of molecular weight distribution of isotactic polypropylene obtained by a MgCl2-supported TiCl4 catalyst
Authors:Takeshi Shiono  Hideaki Hagihara  Tomiki Ikeda  Kazuo Soga
Affiliation:

a Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226, Japan

b Japan Advanced Institute of Science and Technology, 15 Asahidai, Tatsunokuchi, Ishikawa 923-12, Japan

Abstract:It is of great importance in propene polymerization to control molecular weight and molecular weight distribution as well as isotacticity. Propene polymerization was carried out with an isospecific MgCl2/TiCl4-Cp2TiMe2 catalyst in the presence of various kinds of external Lewis bases. It was found that the molecular weight distribution of the isotactic polymer could be controlled while retaining high activity, high isospecificity and high molecular weight only by changing the kind and/or amount of the Lewis bases. © 1997 Elsevier Science Ltd.
Keywords:Polypropylenes   Molecular weight distribution   Chemical variables control   Polymerization   Titanium compounds   Catalyst supports   Magnesium compounds   Lewis base   Isotacticity
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