Patent ID: 6403519
Filing Date: 2002-06-11
Classification: B01J,C08F,Y10S

Abstract:
A process for the preparation of a catalyst for the polymerization of alpha-olefins, in which the catalyst is formed from components comprising(i) a compound of a transition metal selected from the group consisting of Groups 4 to 6 of the Periodic Table and containing at least one optionally substituted cyclopentadiene ligand and (ii) an aluminoxane activator on (iii) a support consisting of porous particles of polyolefin(s), wherein said particles are characterized by a mean diameter, wherein the process comprises contacting the support with a solution containing the activator (ii) to form a suspension; evaporating the suspension in a reactor having walls and fitted with a stirrer, which stirrer comprises a scraping element which follows the walls of the reactor in such a way that the distance between the edges of the scraping element, which are closest to the walls of the reactor, and said walls is from 2 to 200 times the mean diameter of the particles of the support (iii) wherein said transition metal compound is added in the process before, during or after said contacting step.