Patent ID: 6147171
Filing Date: 2000-11-14
Classification: C08F

Abstract:
A process for preparing a catalyst system bya) loading a porous inorganic solid with a chromium compound,b) oxidizing the solid obtained in step a) andc) previously to polymerizing ethylene and 1-alkenes with said catalyst system treating the oxidized solid with a reducing agent previously to the polymerization,d) where appropriate adding an organometallic compound of the first, second, third or fourth main group or of the second subgroup of the Periodic Table of the Elements,wherein organic compounds selected from the group consisting of linear C.sub.4 -C.sub.10 - or cyclic C.sub.3 -C.sub.10 -alkenes having at least one internal C.dbd.C double bond, 1,3-butadiene, C.sub.2 -C.sub.10 -alkynes and C.sub.1 -C.sub.10 -aldehydes are used as reducing agents.