Process for producing ethylene-vinyl alcohol copolymer and...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 8/12 (2006.01) C08F 10/02 (2006.01) C08F 16/06 (2006.01) C08F 210/02 (2006.01) C08F 216/06 (2006.01) C08J 5/02 (2006.01)

Patent

CA 2167953

A process is described for producing ethylene-vinyl alcohol copolymer by saponification of an ethylene-vinyl ester copolymer, wherein the saponification is carried out in a liquid phase with dialkyl sulfoxide being used as solvent. A solution of the ethylene-vinyl alcohol copolymer may be contacted with a solvent which is a non-solvent for the copolymer or a mixed solvent containing at least 20% by weight of the non-solvent, to form the shaped articles. The shape forming may be by a wet or dry-jet-wet system and the shapes are typically hollow fibers, films, sheets, granules, strands, spheres, etc.

Divulgation d'un procédé pour produire un copolymère éthylène-alcool vinylique par saponification d'un copolymère éthylène-ester vinylique, au cours duquel la saponification est réalisée dans un solvant liquide, un sulfoxyde de dialkyde. Une solution du copolymère éthylène-alcool vinylique peut être mise en contact avec un solvant, dans lequel ce copolymère n'est pas soluble, ou avec un mélange de solvants, contenant au moins 20 % en poids du solvant dans lequel ce copolymère n'est pas soluble, afin de mettre en forme les produits. La mise en forme peut être réalisée à l'aide d'un système de jet humide ou sec, et les formes obtenues sont typiquement des fibres creuses, des films, des feuilles, des granules, des brins, des sphères, etc..

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