Blends of and methods of blending evoh polymers and ethylene...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/08 (2006.01) C08L 29/04 (2006.01)

Patent

CA 2285483

A blend composition having improved environmental stress cracking resistance or environmental fatigue resistance, including an ethylene vinyl alcohol polymer and a polymer of ethylene with at least one selected from the group consisting of alpha olefin having at least 2 carbon atoms, and an ethylenically unsaturated carboxylic ester monomer. Flexible products may be made from the blend by heating the blend above its melting point, forming the melted blend into a desired shape, and then cooling the shape below its melting point.

L'invention concerne une composition de mélange conférant une résistance accrue à des craquelures par contrainte ou à une fatigue due à l'environnement. La composition de mélange comprend un polymère d'éthylène vinyle alcool et un polymère d'éthylène, dont au moins un est sélectionné dans le groupe formé par une alpha-oléfine dotée d'au moins 2 atomes de carbone, et un monomère d'ester carboxylique éthylèniquement insaturé. On peut fabriquer des produits flexibles à partir du mélange en chauffant celui-ci à une température supérieure à son point de fusion, en formant le mélange fondu pour obtenir une forme voulue, et en refroidissant la forme à une température inférieure à son point de fusion.

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