Patent ID: 6200922
Filing Date: 2001-03-13
Classification: C08F

Abstract:
A Ziegler-Natta catalyst system, comprising an active constituentsa) a titanium-containing solid component comprising a compound of titanium, a compound of magnesium, a halogen, an inorganic oxide as support and a carboxylic ester as electron donor compound,and also, as cocatalyst,b) an aluminum compound andc) optionally a further electron donor compound,wherein the inorganic oxide itself used has a pH of from 2 to 6, an average particle diameter of from 5 to 200 .mu.m, an average primary particle diameter of from 1 to 20 .mu.m and voids or channels having an average diameter of from 0.1 to 20 .mu.m, wherein the macroscopic volume share of said voids and channels within the overall particle is within the range from 5 to 30%.