Stamicarbon B.v.

Dsm N.v.

Georges G Evens

Luc M Coosemans

Jacob Renkema

Emanuel M J Pijpers

Henri J H Beelen

Andreas A Oosterlaken

Johannes Tijssen

The invention relates to an elastomeric copolymer derived from components comprising a) ethylene, b) an &agr;-olefin, c) a non-conjugated polyene (C) having one C&boxH;C bond that is copolymerizable using a Ziegler-Natta catalyst, and d) optionally a non-conjugated polyene (D) which in the molecule contains two or more C&boxH;C bonds that are copolymerizable using a Ziegler-Natta catalyst. The copolymer is characterized by, inter alia, a specific branching coefficient BC. The invention also relates to a process for the preparation of such copolymers.

Elastomeric copolymer and process for the preparation thereof

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

Process for the preparation of copolymers consisting of 25-85% by wt. of ethylene, 15-75% by wt. of at least one other 1-alkene and optionally up to 20% by wt. of a polyunsaturated compound with application of a catalyst system containing a compound of a metal from sub-groups IV-VI of the periodic system and a compound of a metal from groups I-III of the periodic system, in which at least one hydrocarbon group is bound directly to the metal atom via a carbon atom, the polymerization being carried out in the presence of a halogen-containing compound of the general formula ##STR1## where A is a phenyl group which may contain one or two substituent halogen atoms or alkyl groups, or is a thienyl, furyl, pyrollyl, N-alkylpyrollyl or pyridyl group, which group is bound to the carbon atom directly or via a carbonyl group,

Process for the preparation of copolymers of ethylene with at least one

Process for the preparation of copolymers consisting of 25-85% by wt. of ethylene, 15-75% by wt. of at least one other 1-alkene and optionally up to 20% by wt. of a polyunsaturated compound with application of a catalyst system containing a compound of a metal from sub-groups IV-VI of the periodic system and a compound of a metal from groups I-III of the periodic system, in which at least one hydrocarbon group is bound directly to the metal atom via a carbon atom, the polymerization being carried out in the presence of certain halogen containing activators.

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Maasmechelen, Belgium

Georges G Evens