| 摘要 |
PURPOSE:To obtain a middle fraction in high yield and obtain an alpha-olefin of high purity with a low wax content, by polymerizing ethylene in the presence of a catalyst system containing the specific third component in addition to a Zr compound and Al compound. CONSTITUTION:A gas containing ethylene is polymerized in the presence of a mixture of (A) a zirconium halide expressed by formula I (X and A are Cl, Br or I; a and b are integers 0-4 and a+b is 4) with (B) an alkylaluminum halide compound expressed by formula II (R is 1-20C alkyl; Q is Cl, Br or I; c and d are 1, 1.5 or 2) and (C) one compound selected from the group of sulfur compounds and nitrogen compounds. Methyl disulfide, thiophene, aniline, thiourea, etc., are preferred for the sulfur compounds or nitrogen compounds as the third component. |
