Process for the preparation of polymers of C2 to C12-alkenes using a retarding agent

摘要

A process for the production of polymers of 2-12C alkenes at -50 to 300 degrees C and 0.5-3000 bar in presence of a catalyst system, with the addition of a compound of formula H-M<1))R<1> (I); where M<1> = B, Al, Ga, In or Tl; R<1>, R<2> = H, 1-10C alkyl, 6-15C aryl, or alkaryl or aralkyl with a 1-10C alkyl and a 6-20C aryl group, or 5- to 7-membered cycloalkyl (optionally substituted with 1-10C alkyl); or R<1> + R<2> may form a 4-15C cyclic group. Preferably R<1> and R<2> together form part of a 4-15C bicyclic group; M<1> = boron. The catalyst system contains (A) a metallocene complex and (B) a metallocenium ion-forming compound. A metal compound of formula M<4))r(R<25>)s(R<26>)t (IV) may also be added; M<4> = alkali or alkaline earth metal, or a Sub-Group III metal, i.e. B, Al, Ga, In or Tl; R<24> = 1-10C alkyl, 6-15C aryl, or alkaryl or aralkyl with 1-10C alkyl and 6-20C aryl groups; R<25>, R<26> = as for R<24>, or also halogen or 1-10C alkoxy; r = 1-3; s, t = 0-2; r + s + t = the valency of M<4>.