Ethylene copolymers with narrow composition distribution and...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/16 (2006.01) C08F 4/642 (2006.01) C08F 10/02 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2322496

A copolymer of ethylene and at least one comonomer containing at least 4 carbon atoms is characterized by a polydispersity greater than 2, a broad melting point transition as measured by differential scanning calorimetry, and a narrow composition distribution. Ethylene/C4+ copolymers also may show at least one peak melting point above the peak melting point of a random copolymer of the same monomer unit composition. These copolymers are made by contacting ethylene and a comonomer under polymerization conditions in the presence of a suitable fluxional catalyst system.

Copolymère d'éthylène et d'au moins un comonomère contenant au moins 4 atomes de carbone, qui est caractérisé par une polydispersité supérieure à 2, une large transition du point de fusion telle que mesurée par l'analyse calorimétrique différentielle à compensation de puissance, et une répartition étroite de la composition. Des copolymères éthylène/C¿4+? peuvent également présenter au moins un point de fusion maximal supérieur au point de fusion maximal d'un copolymère statistique ayant la même composition d'unités monomères. Ces copolymères sont obtenus par mise en contact d'éthylène et d'un comonomère dans des conditions de polymérisation en présence d'un système de fluxion catalyseur approprié.

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