TW334445B - Components and catalysts for the polymerization of olefins - Google Patents

Abstract

Components and catalysts for the polymerization of olefins comprising the product obtainable by bringing a compound of a transition metal M selected from Ti, V, Zr and Hf containing at least one or more olefins CH2=CHR, in which R is hydrogen or an alkyl,cycloalkyl or aryl with 1~12 carbon atoms, and of one or more di or polyenes with a coordination catalyst comprising the product obtained by contacting a compound of Ti, V, Zr or HF with a magnesium halide in the form of particles with average size of the crystallites below 300A, the magnesium halide being present in the prepolymer in a quantity of between 50 and 50000 ppm, and transition metal compound is selected from among compounds with the structure; Cp1MR1aR2bR3c(I), Cp1Cp2MR1aR2b(II), (Cp1-Ae-Cp2)M1R1aR2b(III), M is Ti, V, Zr,or Hf; Cp1 and Cp2 , which may be identical or different from each other, are cyclopentadienyl groups which may be substituted;two or more substituents on the cyclopentadienyl groups can form one or more rings having from 4 to 6 C atoms; R1, R2 and R3 which may be identical or different are atoms of hydrogen, halogen, an alkyl or alkoxyl group with 1~20 C atoms, aryl, alkaryl or a substituent containing a silicone atom; A is an alkenyl bridge or has s structure chosen from Ge, Sn, O, S, SO, SO2, NR1, PR1 or P(O)R1 in which M1 is Si, Ge or Sn; R1 and R2 which may be identical or different, are alkyl groups with 1~4 C atoms or aryl groups with 6~10 C atoms ; a, b, c are independently, integer from 0 to 4; e is an integer from 0 to 6 and two or more of the radicals R1, R2 and R3 can form a ring.