Olefin polymerization catalyst and polyolefin

摘要

A novel olefin polymerization catalyst is obtained by contacting the following components (1) to (5) with one another: (1) a compound represented by the general formula Me1R1p(OR2)qX14-p-q, (2) a compound represented by the general formula Me2R3m(OR4)nX2z-m-n, (3) an organocyclic compound having conjugated double bonds; (4) a modified organoaluminum compound having Al-O-Al bond(s); and (5) a silicon oxide and/or an aluminum oxide both having characteristic average particle diameter, specific surface area, volume of pores ranging in pore radius from 18 to 1,000 Angstroms, apparent specific gravity not lower than 0.32, and proportion of 50 mu m or smaller particles.