Solid single site catalysts with high polymerisation activity
AssigneeBorealis AG
InventorsAlexander Reznichenko, Noureddine Ajellal, Pascal Castro, Irfan Saeed
Life of this patent
Estimating the term…
Abstract
Process for the preparation of a solid catalyst system comprising the steps of preparing a liquid clathrate comprising a mixing of an aluminoxane, an aromatic compound and an organo-silicon compound, wherein the mol-ratio between the organo-silicon compound and aluminum of the aluminoxane is below 0.1, mixing said liquid clathrate with an organometallic compound obtaining a liquid mixture, and precipitating the solid catalyst system out of said liquid mixture by adding a saturated aliphatic compound to said mixture liquid.
Claims12
A process for the preparation of a solid catalyst system (CS) comprising the steps of
- (i) preparing a liquid clathrate (LC) comprising a mixing of an aluminoxane (A), an aromatic compound (AC) and an organo-silicon compound (OS), wherein the mol-ratio between the organo-silicon compound (OS) and aluminum (Al) of the aluminoxane (A) [(OS)/(Al)] is equal or below 0.1,
- (ii) mixing said liquid clathrate (LC) with an organometallic compound (C),
- (iii) obtaining a liquid mixture (MI), wherein the liquid mixture (MI) is homogeneous, precipitating the solid catalyst system (CS) out of said liquid mixture (MI) by adding a saturated aliphatic compound to said liquid mixture (MI), and
- (iv) optionally recovering particles of the solid catalyst system (CS),
- wherein during the process no carrier material is added.
Dependencies are inferred from the claim text.