Cross-linked polyethylene resin for large part blow molding

B - Operations – Transporting – 29 – C

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Details

B29C 49/00 (2006.01) B29D 23/00 (2006.01) C08J 3/24 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2668717

The invention relates generally to the production of polyethylene, and particularly to the production of polyethylene that is mixed with peroxides during extrusion to increase the level of long-chain branching. In an aspect, the polyethylene is used for large part blow molding (LPBM ) applications. In an embodiment, the cross-linked polyethylene has a density of from about 0.945 g/cc to about 0.965 g/cc, a molecular weight distribution (MWD) of at least from 10 to 25, for example, and a high load melt index (HLMI) (ASTM D1238 21.6 kg) of from about 1 dg/min to about 30 dg/min. In an embodiment, the cross-linked polyethylene is comprised of at least one olefin having an ESCR of 100 hours to 1000 hours, and a flexural modulus of 120,000 psi to 250,000 psi.

L'invention concerne généralement la production de poly(éthylène), et en particulier la production de poly(éthylène) qui est mélangé avec des peroxydes pendant l'extrusion pour augmenter le niveau de ramification à longue chaîne. Dans un aspect, le poly(éthylène) est utilisé pour des applications de moulage par extrusion-soufflage de grande pièce (LPBM). Dans un mode de réalisation, le poly(éthylène) réticulé a une densité allant d'environ 0,945 g/cm3 à environ 0,965 g/cm3, une distribution de masse moléculaire (MWD) allant d'au moins 10 à 25, par exemple, et un indice de fluidité à charge élevée (HLMI) (norme ASTM D1238 21,6 kg) allant d'environ 1 dg/min à environ 30 dg/min. Dans un mode de réalisation, le poly(éthylène) réticulé est composé d'au moins une oléfine ayant une ESCR (résistance à la fissure de contrainte environnementale) allant de 100 heures à 1 000 heures, et un module de flexion allant de 120 000 psi à 250 000 psi.

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