STUDIES ON VOCL3 MGCL2/NAY/AL(2)ET(3)CL(3) COMPLEX SUPPORT CATALYSTS FOR THE COPOLYMERIZATION OF ETHYLENE AND PROPYLENE/

Using VO2+ as a spin probe, a new method to obtain microenvironmental information on supports was developed which can be used in the choice of supports for coordination catalysts. Utilizing the above method, Na Y was chosen as second support component. A complex support catalyst V OCl3/MgCl2/NaY/Al(2)Et(3)Cl(3) was prepared and used in ethylene-propy lene copolymerization. Higher polymerization activity was obtained wit h this catalytic system. Alternating the ratio of two kinds of support s, the composition and sequence structure of copolymers could be contr olled, which showed that NaY participated in the active species, affec ted the insertion of monomer, and changed the composition and sequence structure of copolymers. (C) 1994 John Wiley and Sons, Inc.