Method of processing polyethylene

C - Chemistry – Metallurgy – 08 – L

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C08L 23/04 (2006.01) C08J 5/18 (2006.01) C08K 5/42 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2260850

Melt processed linear polyethylenes are shown to exhibit improved processability through the addition of certain surfactants. Among the melt processing parameters improved are reduced head pressure, reduced torque, reduced motor load, reduced or eliminated melt fracture, or combinations of these parameters. The surfactants can be chosen from a non-aromatic alkyl sulfonate or sulfate salt wherein a cation of the salt is selected from the group consisting of Na, K, Li, and other alkali cations and a quaternary ammonium cations, said surfactant being essentially free of halogens.

Des polyéthylènes linéaires traités et fondus se sont avérés présenter une meilleure aptitude au traitement grâce à l'addition de certains tensioactifs. Parmi les propriétés de traitement améliorées, on peut citer une pression de charge réduite, un couple réduit, une charge de moteur réduite, une rupture de fusion réduite ou supprimée, ou des combinaisons de celles-ci. On peut choisir les tensioactifs parmi un sulfonate ou sulfate d'alkyle non aromatique dans lequel un cation du sel est choisi dans le groupe constitué par Na, K, Li, et par d'autres cations alcalins et des cations d'ammonium quaternaire, ce tensioactif étant essentiellement dépourvu d'halogènes.

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