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Claudine Viviane Lalanne-Magne

Renaud Viguier

Imen Ghouila

Eric Osmont

Claudine Lalanne-Magne

Novel copolymers having a density (D) in the range 0.895-0.910 g/cm, a melt index MI(2.16 kg, 190&#xb0; C.) in the range of 0.01-6 g/10 min, a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and a sealing initiation temperature (SIT) and density (D) satisfying the relationship SIT&#x2264;(A&#xd7;D)&#x2212;B wherein A is 800&#xb0; C.&#xd7;cm/g and B is 650&#xb0; C., wherein the SIT (&#xb0; C.) is determined on a 70 &#x3bc;m film at 0.5N/15 mm and D Is in units of g/cmare disclosed. The copolymers may be suitably prepared by use of metallocene catalyst systems and may be used in film applications, in particular as sealing layers for packaging applications.

Copolymers and films thereof

Process for the polymerization or copolymerization of olefins by bringing the olefins into contact with a catalyst under polymerization or copolymerization conditions in a reactor containing a charge powder. The process includes, prior to introducing the catalyst into the reactor, introducing a scavenger into the reactor which reacts with catalyst poison present. The scavenger is added to the reactor until the charge powder contains a remaining amount of scavenger of between 0.1 and 2.5 moles per ton of charge powder.

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Simiane-Collongue, France

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