Biaxially stretched polypropylene film

Details Biaxially stretched polypropylene film Biaxially stretched polypropylene film

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B29C 55/12 (2006.01) B29C 55/14 (2006.01) B32B 27/32 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2426662

A biaxially stretched polypropylene film of the present invention has high stiffness in the film longitudinal direction and can be manufactured by a conventional longitudinal-transverse sequential biaxial stretching method, since the biaxially stretched polypropylene film comprises a polypropylene which comprises a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230°C or consists of a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230°C and/or a Trouton ratio of the polypropylene is controlled at a specific value, moreover, the biaxially stretched polypropylene film contains regulated longitudinal fibrils.

Film en polypropylène à orientation biaxiale possédant une forte rigidité dans le sens machine, qui peut être produit selon un procédé d'étirage biaxial séquentiel général sur la longueur et sur la largeur, soit en spécifiant l'additif contenu dans le film, la résistance à la traction à l'état fondu (MS) et l'indice de fluidité (MFR) du polypropylène tel que déterminé à 230 ·C, ou le rapport de Trouton du polypropylène, soit en introduisant dans le film des fibrilles longitudinales spécifiées.

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