Polyester composition and films produced therefrom

Details Polyester composition and films produced therefrom Polyester composition and films produced therefrom

C - Chemistry, Metallurgy

08

L

C08L 67/02 (2006.01) B32B 27/36 (2006.01) C08J 5/18 (2006.01) C08K 3/34 (2006.01) C08K 7/00 (2006.01)

Patent

CA 2192695

A polyester composition comprising 0.005 to 10 % by weight of compound oxide particles having a volume average particle diameter of 0.005 to 2 µ m and composed mainly of silicon (Si), aluminium (A1) and at least one alkali metal (M), wherein the contents of the silicon, aluminium and alkali metal satisfy the following requirements: 10 wt.%? Si ? 45 wt.%, 3 wt.%? Al ? 30 wt.% and 0.5 wt.%? M ? 20 wt.%, respectively. The polyester composition, particularly when formed into films, has excellent surface evenness, running ability and abrasion resistance, and such films are suitable particularly for magnetic recording media and other applications.

Composition au polyester comprenant 0,005 à 10 % en poids de particules d'oxyde composites d'un diamètre particulaire volumique moyen de 0,005 à 2 µm, et qui est constituée essentiellement de silicium (Si), d'aluminium (Al), et d'au moins un métal alcalin (M). Dans cette composition, les teneurs en silicone, en aluminium et en métal alcalin doivent répondre aux exigences suivantes: 10 % en poids <= Si <= 45 % en poids, 3 % en poids <= Al <= 30 % en poids, 0,5 % en poids <= M <= 20 % en poids. La composition au polyester possède, notamment après sa transformation en film, une planéité, une mobilité et une résistance à l'abrasion excellentes. Elle convient particulièrement bien aux supports d'enregistrement magnétiques et à d'autres applications.

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