| 摘要 |
This solid catalyst for olefin polymerisation comprises a cpd. of a group IVB transition metal, aluminoxane, and fine particles of an organic or inorganic carrier, 100 g of the fine particle carrier carries 0.5-500 mg metal atom in the transition metal compd. and 5-50,000 mg of aluminium atom in the aluminoxane. The atomic ratio (A1/M) of the aluminium metal to the transition metal lies between 1 and 1,000 (preferred 20 and 500). The mean particle size of the catalyst lies between 5 and 200 um (preferred 10 and 100 um). The transition metal is specified to be Zr, Ti or Hf. The compd. containing the transition metal is represented by the formula (I) where R1 is cycloalkadienyl group; R2, R3 and R4 are independently cycloalkadienyl, aryl, alkyl, cycloalkyl, aralkylgroup, halogen atm, hydrogen atom, ORa, SRb, NRc or PRd, (where Ra, Rb, Rc and Rd are independently alkyl, cycloalkyl, aryl or aralkyl group; two Rcs and two Rds can combine together to form rings); when R2 is cycloalkadienyl, R1 and R2 can combine through a lower carbon number alkylene group; k = 1, 2, 3 or 4; l, m and n are independently 0, 1, 2, 3 ; k + l + m + n = 4. Aluminoxane is represented by the general formulae (II), (III), where R is hydrocarbon gp. or halogen at hydrocarbon group; m at least 2. The catalyst is prepared by deposition and emulsion of the emulsive solutions of aluminooxane, and the transition metal compd. with carrier particles. |
