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Polyolefin composition with increased resistance against degradation caused by chlorine dioxide
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.
Borealis.
Borealis/Linz.
Borealis.
2011 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The present invention relates to a polyolefin composition with increased resistance to degradation caused by ClO2-containing water and to an article made of such a polyolefin composition. The polyolefin composition comprises a polyolefin base resin (A), at least one antioxidant (B) having an initial oxygen induction time (OIT190°C) of more than 35 min., determined according to the OIT190°C test described herein and having a slope of the curve, when OIT190°C, in minutes, is recorded as a function of exposure time, in minutes, in a chlorine dioxide degradation test as described herein, of at least -0.07, and c) at least one antioxidant (C) having an initial oxygen induction time (OIT190°C) of not more than 35 min., determined according to the OIT190°C test described herein and having a slope of the curve, when OIT190°C, in minutes, is recorded as a function of exposure time, in minutes, in a chlorine dioxide degradation test as described herein, of less than -0.07, wherein said polyolefin composition shows a resistance against water containing 10 ppm chlorine dioxide at 70 °C and a pH of 6.8 ± 0.1 of at least 450 min., expressed as the time to reach 50% of the initial oxygen induction time at 210 °C (OIT(210°C),50%), determined according to the chlorine dioxide degradation test as described herein. The present invention further relates to the use of the polyolefin composition for the production of an article, e.g. a pipe, a fitting or a storage container and to the use of the polyolefin composition for increasing the resistance of an article against degradation caused by contact with ClO2-containing water.

Place, publisher, year, edition, pages
2011.
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-90853OAI: oai:DiVA.org:kth-90853DiVA: diva2:506909
Patent
EP 2607417A1
Note

QS 2014

Available from: 2012-03-01 Created: 2012-03-01 Last updated: 2015-01-16Bibliographically approved

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Output format
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