High drawdown extrusion process

B - Operations – Transporting – 29 – C

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B29C 47/00 (2006.01) B29C 47/02 (2006.01) B29D 7/00 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01) C08L 23/04 (2006.01) C08L 23/08 (2006.01) C08F 10/02 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2165191

A process for extending a thermoplastic composition at higher drawdown rates with less neck-in and greater resistance to draw resonance as well as processes for extrusion coating a substrate and for making an extrusion-cast film are disclosed. The thermoplastic composition is made of at least one substantially linear ethylene polymer used alone or in combination with at least one high-pressure ethylene polymer and/or with at least one heterogeneous linear olefin polymer.

L'invention concerne un procédé d'extrusion d'une composition thermoplastique à des taux d'allongement très élevés et avec moins de nervures et ayant une résistance supérieure à la résonance d'étirage, ainsi que des procédés de couchage par extrusion d'un substrat et de fabrication d'un film coulé par extrusion. La composition thermoplastique est composée d'au moins un polymère d'éthylène sensiblement linéaire utilisé seul ou en combinaison avec au moins un polymère d'éthylène à haute pression et/ou avec au moins un polymère d'oléfine linéaire, hétérogène.

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