Ultra high molecular weight polyethylene fractions having...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/02 (2006.01) C08F 6/04 (2006.01)

Patent

CA 2552829

Polymer fractions such as polyethylene fractions can be produced that have a PDT less than 2.3 and a M,~ greater than 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a relatively good solvent. The conditions employed for such dissolution are selected to reduce the degradation of the parent polymer. The resulting parent solution is transported into a fractionation column in which a support is disposed. The fractionation column is thereafter operated at conditions effective to form a precipitate on the support comprising the desired polyethylene fraction. The polyethylene fraction may then be recovered from the fractionation column by repeatedly displacing a solvent/non-solvent mixture into the column to dissolve the polyethylene fraction. The relative concentrations of the solvent and the non-solvent are based on a solvent gradient profile of the polyethylene parent polymer.

L'invention concerne des fractions polymères telles que des fractions de polyéthylène pouvant être produites et qui présentent un indice de polydispersion inférieur à 2,3 et un M¿w? supérieur à 1 000 000 g/mol, 3 000 000 g/mol, ou 6 000 000 g/mol. Lesdites fractions de polyéthylène sont préparées à partir d'un polymère parent du UHMWPE grâce à une première dissolution du polymère parent dans un solvant relativement efficace. Les conditions nécessaires à la dissolution sont sélectionnées de manière à réduire la dégradation du polymère parent. La solution parente ainsi obtenue est transportée dans une colonne de fractionnement, dans laquelle un support est disposé. Ladite colonne peut fonctionner dans des conditions efficaces pour former un précipité sur le substrat comprenant la fraction de polyéthylène souhaitée. La fraction de polyéthylène peut être ensuite récupérée de la colonne de fractionnement au moyen de déplacements répétés d'un mélange solvant/ non solvant dans la colonne, ce qui permet de dissoudre la fraction de polyéthylène. Les concentrations relatives du solvant et du non solvant sont fondées sur un profil de gradient de solvant du polymère parent de polyéthylène.

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