To obtain a catalyst for ethylene polymerization, capable of providing a polymer having sufficiently high polymerization activity and high molecular weight and excellent in powder properties by simultaneously supporting zirconocene, etc., and titanocene on an ion exchangeable layered compound.
This catalyst comprises a product obtained by bringing (A) a metallocene-based transition metal compound containing zirconium or hafnium into contact with (B) a metallocene-based transition metal compound, (C) an ion-exchangeable layered compound or a non layered structural inorganic silicic acid salt and (D) an organoaluminum compound. Furthermore, α-olefin polymer obtained by preliminarily polymerizing α-olefin in the presence of (E) a contact product of the components A to D is preferably included in an amount of 0.01-1,000g based on 1g component C.
IMAEDA KAORI
UEHARA YUMITO
