Oxygen tailoring of polyethylene film resins

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/06 (2006.01)

Patent

CA 2489018

Processes are disclosed for oxygen-tailoring polyethylene resin. Polyethylene resin is conveyed through a feed zone, a melt-mixing zone and a melt zone. The resin is contacted with oxygen in an amount of at least 40 parts by weight O2 per million parts by weight resin, and contacted with primary antioxidant downstream of the point or points of oxygen contact. The oxygentreated resin can be used to make polyethylene film having improved gauge uniformity.

L'invention porte sur des procédés de traitement par l'oxygène de résines pour films de polyéthylène selon lesquels une résine de polyéthylène est convoyée à travers une zone d'apport, une zone de fusion/mélange, et une zone de fusion, et mise en contact avec de l'oxygène à raison de 40 ppm d'O¿2? du poids de la résine, puis avec un antioxydant primaire en aval du ou des points de contact avec l'oxygène. La résine traitée par l'oxygène peut servir à la fabrication de films de polyéthylène d'épaisseur plus uniforme.

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