Crosslinked blends of amorphous and crystalline polymers and...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/10 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2393481

The present invention is broadly directed to a polyolefin polymer composition produced by copolymerizing one or more alpha-olefins and one or more di-olefin monomers in the presence of at least one stereospecific metallocene catalyst system and at least one non-stereospecific metallocene catalyst system. The polymer composition so produced contains amorphous polymer segments and crystalline polymer segments in which at least some of the segments are crosslinked. Both the amorphous and the crystalline polymer segments are copolymers of one or more alpha-olefins and one or more di-olefin monomers. Crosslinking of at least a portion of the mixture of polymer segments is accomplished during the polymerization of the composition by incorporation of single di-olefin comonomers into two polymer segments.

La présente invention concerne, de manière générale, une composition de polymères polyoléfiniques que l'on obtient par la copolymérisation d'une ou de plusieurs alpha-oléfines et d'un ou de plusieurs monomères di-oléfiniques, en présence d'au moins un système de catalyseur à métallocène stéréospécifique et d'au moins un système de catalyseur à métallocène non stéréospécifique. La composition polymère ainsi obtenue contient des segments polymères amorphes et des segments polymères cristallins, certains segments au moins étant réticulés. Les segments polymères amorphes et cristallins sont tous des copolymères d'une ou de plusieurs alpha-oléfines et d'un ou de plusieurs monomères di-oléfiniques. On procède à la réticulation d'une partie au moins de ce mélange de segments polymères lors de la polymérisation de la composition, par l'incorporation de comonomères di-oléfiniques simples dans les deux segments polymères.

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