Polyolefin compositions having improved low temperature...

Details Polyolefin compositions having improved low temperature... Polyolefin compositions having improved low temperature...

C - Chemistry, Metallurgy

08

L

C08L 23/16 (2006.01) C08L 23/10 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2408337

Disclosed are blends of a propylene-based polymer, an elastomer, and optionally an ethylene-based polymer, having improved low temperature toughness, and methods of making such blends. The elastomer is preferably a copolymer of ethylene, one or more C3-C20.alpha.-olefin comonomers, and optionally one or more non-conjugated diene comonomers, having an MLRA/ML ratio of at least 8 and an ethylene content of from 74 to 95 mole percent.

L'invention concerne des mélanges d'un polymère à base de propylène, d'un élastomère et éventuellement d'un polymère à base d'éthylène, possédant une ténacité améliorée à basse température, ainsi que des procédés de fabrication de ces mélanges. L'élastomère est de préférence un copolymère d'éthylène, un ou plusieurs comonomères d'.alpha.-oléfine ayant de 3 à 20 atomes de carbone et, éventuellement, un ou plusieurs comonomères diéniques non conjugués, ayant un rapport MLRA/ML d'au moins 8 et une teneur en éthylène comprise entre 74 et 95 % molaire.

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