Polyolefin composition with increased resistance to...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/13 (2006.01) C08K 5/3435 (2006.01) C08K 5/372 (2006.01)

Patent

CA 2665277

The present invention relates to a polyolefin composition comprising a polyolefin base resin and an antioxidant, characterized in that said polyolefin composition has a lifetime of at least 200 h in a test measuring the resistance against ClO2-containing water at 90°C and at a concentration of ClO2 of 4 ppm wherein the equipment used is according to ASTM F2263-03. The present invention further relates to a pipe comprising the polyolefin composition according to the invention, to the use of the polyolefin composition for the production of a pipe, and to the use of a particularly selected antioxidant for increasing the resistance of a polyolefin composition against degradation caused by contact with ClO2-containing water.

La présente invention concerne une composition de polyoléfine comprenant une résine à base de polyoléfine et un antioxydant, caractérisée en ce que ladite composition de polyoléfine a une durée de vie d'au moins 200 h dans un test mesurant la résistance vis-à-vis de l'eau contenant du ClO2 à 90°C et à une concentration en ClO2 de 4 ppm, le matériel utilisé étant selon la norme ASTM F2263-03. La présente invention concerne en outre un tuyau comprenant la composition de polyoléfine selon l'invention, l'utilisation de la composition de polyoléfine pour la production d'un tuyau et l'utilisation d'un antioxydant sélectionné particulier pour augmenter la résistance d'une composition de polyoléfine vis-à-vis de la décomposition provoquée par le contact avec de l'eau contenant du ClO2.

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