| abstract |
The present invention relates to olefins of the formula R a -CH = CH-R b , wherein R a and R b are the same or different and are hydrogen atoms or hydrocarbon radicals having 1 to 14 carbon atoms, or R a and R b are combined with these A metallocene of formula 1, wherein the metallocene is in the meso: racemic form, as a transition metal compound in a temperature range of -60 to 200 ° C. under a pressure of 0.5 to 100 bar under a pressure of 0.5 to 100 bar. And a method for preparing an olefin polymer by polymerizing or copolymerizing in a solution, suspension or gas phase in the presence of a meso: racemic mixture having a ratio of greater than 1:99.n n n Formula 1n n n n n n n n In the above formula,n n n M 1 is Zr or Hf,n n n R 1 and R 2 are the same or different and are methyl or chlorine,n n n R 3 and R 6 are the same or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl,n n n R 4 and R 5 are hydrogen or as defined for R 3 and R 6 ,n n n R 4 together with R 6 form an aliphatic or aromatic ring, or adjacent radicals R 4 form a ring of this form,n n n Radicals,n n n m + n is 0 or 1; |