Polypropylene composition for air quenched blown films

C - Chemistry – Metallurgy – 08 – F

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Details

C08F 110/06 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2540887

The invention is directed to a polypropylene resin, which is suitable for manufacturing an air quenched blown film. The resin has a melt flow rate of greater than 5 g/10 min, less than 2% xylene solubles, a pentad isotacticity of greater than 95%, an isotactic pentad/triad ratio of greater than 95%, a crystallinity of at least 65%, and a crystallization temperature of at least 127~C. The polypropylene resin contains from 500 ppm to 2500 ppm of a nucleator/clarifier additive. A quenched blown film made from resin exhibits a crystallization onset temperature of at least 116~C and a crystallization half- life time of less 4.1 seconds or less when tested using fast DSC analysis with a scan rate of 200~C/minute.

La présente invention concerne une résine polypropylène qui convient à la production d'un film soufflé refroidi à l'air. La résine a un débit de fusion supérieur à 5 g/10 min, comprend moins de 2 % de xylène soluble, et a une isotacticité de pentade supérieure à 95 %, un rapport isostatique pentade/triade supérieur à 95 %, une cristallinité d'au moins 65 %, et une température de cristallisation d'au moins 127 ·C. La résine polypropylène contient de 500 ppm à 2500 ppm d'un additif de nucléation/clarification. Un film soufflé refroidi à l'air réalisé à partir de la résine, a une température de début de cristallisation d'au moins 116 ·C et une demi-vie de cristallisation de moins de 4,1 secondes ou moins, lors de l'essai par analyse DSC rapide avec une vitesse de balayage de 200 ?·¿C/minute.

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