Structures of polyethylene and copolymers of ethylene with 1-octene and oligoethylene produced with the Cp2ZrCl2 and [(C5Me4)SiMe2N(t-Bu)]TiCl2 catalysts

✍ Scribed by Kazuo Soga; Toshiya Uozumi; Shuji Nakamura; Tatsuya Toneri; Toshiharu Teranishi; Tsuneji Sano; Takashi Arai; Takeshi Shiono

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 506 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021971220

✦ Synopsis

Abstract

Polymerization of ethylene and copolymerizations of ethylene with 1‐octene and oligoethylene having a vinyl end group were conducted with Cp~2~ZrCl~2~ and [(C~5~Me~4~)SiMe~2~N(t‐Bu)]TiCl~2~^a^ as catalysts, and the structures of the resulting polymers were analyzed in detail. The Cp~2~ZrCl~2~ catalyst combined with methylalumoxane (MAO) gives polyethylene with vinyl, vinylidene and trans‐vinylene groups. The use of Al(iC~4~H~9~)~3~/(C~6~H~5~)~3~C · B(C~6~F~5~)~4~ as cocatalyst produces polyethylene predominantly containing trans‐vinylene groups. Polyethylene with vinyl end groups was obtained selectively with [(C~5~Me~4~)SiMe~2~N(t‐Bu)]TiCl~2~MAO as catalyst. The types and contents of CC double bonds in polyethylene markedly depend upon the metallocene compound as well as as the cocatalyst. In the copolymerizations the [(C~5~Me~4~)SiMe~2~N(t‐Bu)]TiCl~2~MAO catalyst system, on the other hand, gives poly[ethylene‐co‐(1‐octene)] with a high content of 1‐octene and a polyethylene containing an appreciable amount of long‐side‐chain oligoethylene.