Control of molecular weight distribution of isotactic polypropylene obtained by a MgCl<sub>2</sub>-supported TiCl<sub>4</sub> catalyst期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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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