Method of processing polyethylene and polyethylene/elastomer...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/04 (2006.01) C08J 5/00 (2006.01) C08K 5/42 (2006.01) C08L 23/06 (2006.01)

Patent

CA 2259529

Melt processed linear polyethylenes which may optionally contain an elastomer 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 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 quaternary ammonium cations, said surfactant being essentially free of halogens.

Des polyéthylènes linéaires traités, fondus et pouvant contenir éventuellement un élastomère, 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 tête 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 un sel de sulfate 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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