Catalyst system for (co) polymerization of ethylene in solution

• Main Authors: VAN DEN BOSCH; FRANS J. P. G, COOSEMANS; LUC M. C
• Format: Patent
• Language: English
• Published: 03.04.1990
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; THEIR RELEVANT APPARATUS; TRANSPORTING

Catalyst system, suitable for the (co)polymerization of ethylene and optionally minor amounts of 1-alkenes and/or dienes at such temperatures that the copolymer formed goes into solution, to be prepared by combining at least two components A and B, which components comprise: A : one or more magnesium compounds, one or more aluminium compounds, one or more transition metal compounds and optionally one or more halogen compounds, in such amounts that the atomic ratio of halogen to magnesium is at least 2, the atomic ratio of aluminium to transition metal is at least 3, the atomic ratio of aluminium to magnesium is at least 1, and the atomic ratio of magnesium to transition metal is at least 0.5, B : one or more organoaluminium. compounds of the general formula Rm Al X 3-m, where the symbols R are equal or different and represent a hydrocarbon residue with 1-20 carbon atoms and the symbols X are equal or different and represent a hydrogen atom, a group of the general formula -NR 2 (where R is a hydrocarbon residue with 1-10 carbon atoms), a group of the general formula -OR (where R is a hydrocarbon residue with 1-20 carbon atoms or a group of the general formula -Si(R )3, where the symbols R are equal or different and represent a hydrogen atom and/or a hydrocarbon residue with 1-20 carbon atoms), and 0 < m < 3, or a group of the general formula -[OAlR )]n-OAlR2 , where the symbols R are equal or different and represent a hydrocarbon residue with 1-10 carbon atoms, and n >/= 0, which two components are, separately or in combination, supplied direct to the polymerization vessel in such amounts that the atomic ratio of the aluminium from component B to the aluminium from component A is at least 0.1.