Aromatic polyamide film and magnetic recording media made by...

B - Operations – Transporting – 32 – B

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B32B 27/34 (2006.01) B32B 27/06 (2006.01) B32B 27/08 (2006.01) B32B 33/00 (2006.01) G11B 5/73 (2006.01) G11B 5/733 (2006.01)

Patent

CA 2279393

An aromatic polyamide film, which is a laminated film comprising at least two layers characterized in that at least one outermost layer (A) of the film is one made from a mixture comprising an aromatic polyamide and one or more other polymers, has a content of the other polymers of 0.1 to 10 wt.%, and satisfies the relationships: 0.01t/d0.5, 0.05s/L1 (wherein d represents the thickness (µm) of the layer (A); t represents the diameter (µm) of the equivalent circle of the other polymers; and L and s represent the major and minor axes (µm) thereof, respectively). The film is free from creasing and telescoping in the wind-up step and is excellent in surface wear resistance, thus being particularly useful as a high-productivity base film for magnetic recording media.

Feuil stratifié de polyamide aromatique comprenant au moins deux couches caractérisées par le fait que la couche (A) la plus extérieure du feuil est préparée à partir d'un mélange composé d'un polyamide aromatique et d'un ou de plusieurs autres polymères, possède une teneur en ces autres polymères de 0,1 à 10 % en poids et répond aux rapports suivants: 0,01?t/d?0,5 et 0,05?s/L?1 (dans lesquels d représente l'épaisseur (µm) de la couche (A); t représente le diamètre (µm) du cercle équivalent des autres polymères, L et s représentant les axes majeur et mineur (µm) respectifs de ces polymères). Ce feuil ne subit ni plissage ni télescopage pendant l'étape d'enroulement et présente une résistance excellente à l'usure de surface, ce qui le rend particulièrement utile en tant que feuil de base extrêmement productif pour la fabrication de supports d'enregistrement magnétique.

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