Philips catalysts reduced with organic compounds and possessing short induction times
AssigneeBASF SE
InventorWolfgang Rohde
Life of this patent
Estimating the term…
Abstract
Catalyst systems which are suitable for polymerizing ethylene and 1-alkenes comprise as active constituents A) a chromium-containing component obtainable by reducing an oxidized Phillips catalyst with organic compounds selected from the group of linear C.sub.4 -C.sub.10 - or cyclic C.sub.3 -C.sub.10 -alkenes with at least one internal C.dbd.C double bond, of 1,3-butadiene, of C.sub.2 -C.sub.10 -alkynes and of C.sub.1 -C.sub.10 -aldehydes, with or without B) an organometallic compound of the first, second, third or fourth main group or of the second subgroup of the Periodic Table of the Elements.
Claims4
A process for preparing a catalyst system by
- a) loading a porous inorganic solid with a chromium compound,
- b) oxidizing the solid obtained in step a) and
- c) 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.
Dependencies are inferred from the claim text.