Flexible film provided with a fine spherulitic polyamide...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 13/02 (2006.01) B32B 27/18 (2006.01) B32B 27/20 (2006.01) B32B 27/34 (2006.01) C08J 5/18 (2006.01) C08K 3/34 (2006.01) C08K 5/20 (2006.01) C08K 7/00 (2006.01) C08K 9/10 (2006.01)

Patent

CA 2347112

The invention relates to a film comprising at least one layer (I) essentially made of spherulitic crystallized polyamide containing solid, anisotropic nucleating fillers (A) as dispersed constituents. The film is characterized in that the fillers (A) in layer (I) have an expansion of no greater than 10 nm in the numerical weighted average of all dispersed constituents of the fillers (A) in at least one direction (<u>rl</u>) which can be freely selected for each dispersed constituent. In addition, the individual spherulites in layer (I) have a diameter of a numeric average no greater than 1000 nm and no less than 100 nm in at least one plane which is perpendicular to the film surface. The numerically predominant portion of dispersed constituents of the fillers (A) in layer (I) represent the crystal nucleus of a spherulite each time. The invention also relates to the use of the inventive film as packaging material.

L'invention concerne un film comportant au moins une couche (1) constituée d'un polyamide cristallisé de façon sensiblement sphérolithique et contenant des matières de charge (A) solides, anisotropes de nucléation en tant que composants dispersés. Ledit film se caractérise en ce que les matières de charge (A) contenues dans la couche (I) présentent, en moyenne arithmétique pondérée de tous les composants dispersés, des matières de charge (A), dans au moins une direction (<u>rl</u>) pouvant être sélectionnée librement pour chaque composé dispersé, une longueur ne dépassant 10 nm, les sphérolithes individuels de la couche (1) présentent, dans au moins un plan perpendiculaire à la surface du film, un diamètre (2), en moyenne arithmétique, d'un maximum de 1000 nm et d'un minimum de 100 nm, et la partie arithmétiquement prépondérante des composants dispersés des matières de charge (A) de la couche (I) représente chaque fois le germe de cristallisation d'un sphérolithe. L'invention concerne également l'utilisation de ce film en tant que matériau d'emballage.

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