Ethene–propene copolymerization with the MgCl2-supported dichlorobis(4,4,4-trifluoro-1-phenyl- 1,3-butanedionato)titanium catalyst activated by an ordinary trialkylaluminum

✍ Scribed by Eiichi Kaji; Toshiya Uozumi; Jizhu Jin; Tsuneji Sano; Kazuo Soga

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 128 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19981115)36:15<2735::aid-pola9>3.0.co;2-t

✦ Synopsis

The Ti(BFA) 2 Cl 2 /MgCl 2 -Al(C 2 H 5 ) 3 catalyst (BFA ϭ 4,4,4-trifluoro-1-phenyl-1,3-butanedione) modified by DIPDMS (diisopropyldimethoxysilane), which had been proved to yield an extremely high isotactic polypropene in high selectivity, was tested for the copolymerization of ethene with propene. The analysis of resulting copolymers by CFC (cross fractionation chromatography) indicated the formation of a small quantity of ethene-rich copolymers as a byproduct, suggesting that the catalyst possesses not only Ti(III) species but a small portion of Ti(II) species. Whereas, the same catalyst without being modified by an external donor selectively yielded propenerich random copolymers resulting from Ti(III) species in high yields.