Articles made from polypropylene, higher .alpha.-olefin...

Details Articles made from polypropylene, higher .alpha.-olefin... Articles made from polypropylene, higher .alpha.-olefin...

C - Chemistry, Metallurgy

08

F

C08F 210/06 (2006.01) C08F 10/06 (2006.01) C08J 5/18 (2006.01) C08L 23/14 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2191123

Articles made from propylene, .alpha.-olefin copolymer, where the .alpha.-olefin has 5 or more carbon atoms, made with a metallocene catalyst system, provide substantially higher cold flow resistance than propylene copolymers made from .alpha.-olefins having 4 or fewer carbon atoms Other properties such as ultimate tensile strength and impact strength are substantially higher as well. Such polymers can be used to advantage in flexible films, tubing, fibers, fabrics, oriented films, extruded profiles, molded parts, and sheets.

L'invention concerne des articles en copolymères de propylène et d'.alpha.-oléfine, l'.alpha.-oléfine comportant au moins 5 atomes de carbone. Ces copolymères produits avec un système de catalyseur d'alliage organométallique présentent une résistance au fluage à froid nettement supérieure aux copolymères de propylène obtenus à partir d'.alpha.-oléfine comportant un nombre d'atomes de carbone inférieur ou égal à quatre. Les autres propriétés telles que la résistance à la traction et la résilience sont également nettement supérieures. Ces polymères peuvent être avantageusement utilisés dans les films flexibles, les tubes, les fibres, les tissus, les films orientés, les profilés extrudés, les pièces moulées et les feuilles.

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