Biaxially oriented film of high molecular weight...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01) B01D 39/16 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/26 (2006.01) B29C 55/00 (2006.01) B29C 55/12 (2006.01) C08J 5/18 (2006.01) C08J 7/02 (2006.01) B29C 59/00 (2006.01)

Patent

CA 2104955

Disclosed are biaxially oriented films of high molecular weight polyethylene which have a fibril structure and are excellent in gas permeability, tensile modulus and tensile strength and in which the coefficient of static friction and the coefficient of kinetic friction are both 1.0 or less. The biaxially oriented films may be obtained by removing by extraction a hydrocarbon plasticizer from a sheet formed from a high molecular weight polyethylene and the hydrocarbon plasticizer, stretching the resulting sheet to obtain an oriented film having a specific surface area of 70 m2/g or more and a fibril structure, and heating the oriented film under a standard length constraint, thereby reducing the oriented film in specific surface area by 20 m2/g or more. The biaxially oriented films may be used as films for lamination products, filters, or may be useful as packaging materials for moisture absorbers or the like.

L'invention porte sur des pellicules à orientation biaxiale, constituées de polyéthylène de masse moléculaire élevée et possédant une structure de fibrille; elles sont excellentes du point de vue perméabilité des gaz, module d'élasticité en traction et résistance à la traction, et leurs coefficients de frottement statique et de frottement dynamique ne dépassent pas 1,0. Ces pellicules peuvent être obtenues par élimination extractive d'un plastifiant hydrocarboné dans une feuille formée à partir d'un polyéthylène de masse moléculaire élevée et dudit plastifiant, avec allongement de la feuille résultante pour produire une pellicule orientée possédant une aire surfacique spécifique de 70 m2/g ou plus et une structure de fibrille; cette pellicule est chauffée en maintenant une longueur normalisée, ce qui réduit l'aire surfacique spécifique de 20 m2/g ou plus. Ces pellicules à orientation biaxiale peuvent servir dans des produits laminés, des filtres, ou encore comme emballages pour des produits absorbant l'humidité ou des matières analogues.

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