| 摘要 |
<p>U.S. 18,418 A new improved Ziegler type catalyst system for alpha-olefin type polymerization includes R'3Y or R'2YX and mixtures thereof, at least one Group IVB-VIII transition metal halide and an alkyl metal compound selected from R'2YNR2 and R'XYNR2, wherein Y is Al, Ga or In. The improved catalyst system provides increased polymerization activity without significantly affecting the crystallinity of the polymer.</p> |
