Thermoset cross-linked polymeric compositions and method of...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/06 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2662503

Embodiments of the present invention include a heat-shrinkable article, comprising a thermoset cross-linked polymeric composition, wherein the cross-linked polymeric composition comprises at least one polypropylene polymer, and at least one polyethylene polymer, wherein the composition has a polypropylene content of less than about 50 percent by weight, and a polyethylene content of less than about 50 percent by weight, based on the total weight of the cross-linked polymeric composition. A method for making the heat-shrinkable article comprises melt mixing the at least one polypropylene polymer with the at least one polyethylene polymer and at least one additional ingredient, extruding the composition blend to form an extruded material, cross-linking the extruded material to produce a thermoset cross-linked material, stretching the cross-linked material at a temperature at or above a melting point of the material, and cooling the stretched material to maintain a form of the stretched material.

Les modes de réalisation de la présente invention concernent un article thermorétractable contenant une composition polymère réticulée thermodurcissable renfermant au moins un polymère polypropylène et au moins un polymère polyéthylène. Ladite composition possède une teneur en polypropylène inférieure à environ 50 % en poids et une teneur en polyéthylène inférieure à environ 50 % en poids, sur la base du poids total de la composition polymère réticulée. Un procédé de fabrication de l'article thermorétractable consiste à : mélanger en fusion le polymère polypropylène avec le polymère polyéthylène et au moins un composant supplémentaire ; extruder le mélange de la composition afin d'obtenir un matériau extrudé ; réticuler le matériau extrudé en vue de produire un matériau réticulé thermodurcissable ; étirer le matériau réticulé à une température supérieure ou égale au point de fusion du matériau ; et refroidir le matériau étiré afin de conserver la forme du matériau étiré.

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