Extrusion compositions having high drawdown and...

C - Chemistry – Metallurgy – 08 – L

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400/6578, 400/65

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

Patent

CA 2205116

An ethylene polymer extrusion composition having high drawdown and substantially reduced neck-in, a process for making such a composition and a process of using such a composition to prepare extrusion coatings, extrusion profiles and extrusion cast films are disclosed. The ethylene polymer extrusion composition is made of 75-95 weight percent of at least one ethylene .alpha.-olefin interpolymer and 5-25 weight percent of at least one high pressure ethylene polymer characterized as having high melt strength and a broad, bimodal molecular weight distribution. In profiles, coatings or films, the composition can be used as sealant, adhesive or abuse resistance layers.

L'invention concerne une composition d'extrusion de polymères d'éthylène à étirage élevé et à striction considérablement réduite, un procédé d'élaboration de cette composition et un procédé relatif à son utilisation pour l'élaboration de revêtement, de profilés et de films moulés obtenus par extrusion. La composition d'extrusion des polymères d'éthylène comprend, en poids, 75 à 95 % au moins d'un interpolymère éthylène .alpha.-oléfine, et 5 à 25 % au moins d'un polymère d'éthylène à haute pression caractérisé par une résistance de fusion élevée et une large répartition de poids moléculaire de type bimodal. Dans les profilés, les revêtements et ou les films, la composition peut être utilisée comme matériau d'étanchéité ou adhésif ou bien comme couche résistant aux utilisations abusives.

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