Rotomolding process for polyethylene articles

Details Rotomolding process for polyethylene articles Rotomolding process for polyethylene articles

C - Chemistry, Metallurgy

08

J

C08J 5/00 (2006.01) B29C 41/04 (2006.01) C08K 5/17 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2759289

The present invention relates to a process for the production of polyethylene hollow articles, which process comprises charging the polyethylene with one or more NO-acyl hindered amine additives containing one or more groups of formula (I), filling this mixture into a mold, heating this mold in an oven to above 28O C, such that the additized polyethylene melts, rotating the mold around at least 2 axes, the additized polyethylene spreading to the walls, cooling the mold while still rotating, open- ing it, and taking the resultant hollow article out, where the group of formula (I) is where R a is a monoacyl or diacyl radical; R1 -- R4 are each C1C6alkyl; and R5 and R6 are each, independently of one another, hydrogen, CrC6alkyl or C6-C10aryl; or R5 and R6 are together oxygen.

La présente invention porte sur un procédé de fabrication d'articles creux en polyéthylène, lequel procédé comprend la charge du polyéthylène avec un ou plusieurs additifs amines encombrés par NO-acyle contenant un ou plusieurs groupes de formule (I), le remplissage de ce mélange dans un moule, le chauffage de ce moule dans un four au-dessus de 280°C, de telle sorte que le polyéthylène à additifs fonde, la rotation du moule autour d'au moins deux axes, le polyéthylène à additifs s'étalant sur les parois, le refroidissement du moule en maintenant la rotation, son ouverture, et la sortie de l'article creux résultant, où le groupe de formule (I) se situe là où R1 est un radical monoacyle ou diacyle ; R1-R4 représentent chacun un alkyle en C1-C6 ; et R5 et R6 représentent chacun, indépendamment de l'autre, hydrogène, alkyle en C1-C6 ou aryle en C6-C10 ; ou R5 et R6 forment ensemble oxygène.

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