Polypropylene films

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) C08F 4/643 (2006.01) C08F 10/06 (2006.01) C08F 110/06 (2006.01) D01D 5/098 (2006.01) D01F 6/06 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 210/06 (2006.01)

Patent

CA 2420052

The present invention provides isotactic polypropylene compositions suitable for cast film applications, cast polypropylene films made therefrom, and processes for forming such films. The novel polypropylene films are formed from film resins having a melt flow ratio of from 6.15 dg/min, with a narrow molecular weight distribution, narrow composition distribution, low level of solvent extractables, and increased film clarity (i.e., decreased haze %) compared to prior art Ziegler-Natta polypropylene film resins. The polypropylene films can be cast from an extruded polypropylene polymer, the extruded isotactic polypropylene polymer being formed by polymerization with a fluorided silica supported catalyst.

L'invention concerne des compositions isotactiques de polypropylène adaptées pour des applications de film, des films de polypropylène coulés fabriqués grâce à ces applications et enfin, des procédés permettant de réaliser ces films. Les nouveaux films de polypropylène sont formés à partir de résines de film dont le taux de fusion est compris entre 6,15 dg/min, avec une répartition de poids moléculaire réduit, un faible niveau d'éléments extractibles de solvant et une clarté de film accrue (par exemple, un pourcentage de voile réduit) par rapport aux résines de film de polypropylène Ziegler-Natta de l'art antérieur. Les film de polypropylène peuvent être coulés à partir d'un polymère de polypropylène extrudé, le polymère de polypropylène isotactique extrudé étant formé par polymérisation au moyen d'un catalyseur à support de silicium fluoré.

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