Stamicarbon B.v.

Other

Luc M Coosemans

Johannes Blenkers

Frans J Van Den Bosch

Georges G Evens

Johannes Tijssen

The subject invention relates to a process for preparing a polymer substantially formed from ethylene modified with at least one linear .alpha.,.omega.-diene. In particular, the process involves reacting ethylene with the at least one diene in an inert dispersant. The reaction is carried out in the presence of a magnesium, aluminum, and titanium- and/or vanadium-containing catalyst at a polymerization temperature of at least 135.degree. C. The at least one diene utilized has at least 7 carbon atoms, two non-conjugated double bonds, and is at least 0.001 mole % but less than 0.1 mole % of the total polymer. Furthermore, the at least one diene must be present in an amount small enough such that the activation energy of the viscous flow of the polymer formed is not significantly influenced by the presence of the diene.

Process for preparing modified polyethylene

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:

Catalyst system for (co) polymerization of ethylene in solution

The disclosed polymers comprise ethylene, one or more higher alkenes-1 having 3-18 carbon atoms in an amount of 0 to 15 mole.-% calculated on the ethylene, and such a small amount of one or more poly-unsaturated compounds having at least 7 carbon atoms and at least two non-conjugated double bonds polymerizable under the influence of transition metal catalysts wherein the activation energy of the viscous flow of the polymer is not significantly influenced by the presence of the poly-unsaturated compound(s).

Modified polyethylene, and products produced from modified polyethylene

Catalyst system for (co)polymerization of ethylene in solution

The process for (co)polymerization comprises polymerizing ethylene and optionally minor amounts of 1-alkenes and/or dienes at a temperature greater than 180.degree. C. in the presence of a catalyst system prepared by combining at least two components, A and B, which components comprise:

Catalyst system for high-temperature (co)-polymerization of ethylene

A catalyst system is disclosed as a combination of at least two components comprising: component A which is one or more titanium compounds and one or more vanadium compounds mixed with one or more organoaluminum compounds in such in amount that the atomic ratio of aluminum to the sum of titanium and vanadium is at least 3; and component B which comprises one or more organoaluminum compounds, wherein one or both of components A and B contain a chloride, and wherein during use such two components are fed, separately or in combination, directly to the reaction vessel in such an amount that the atomic ratio of the chlorine from components A and/or B to the sum of titatium and vanadium of component A is at least 6. The catalyst system is suitable for copolymerizing ethylene and optionally minor amounts of 1-alkenes and/or dienes at high polymerization temperatures.

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Houthalen, Belgium

Luc M Coosemans