Composition and method for color improvement of nitroxyl...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/20 (2006.01) C08K 3/30 (2006.01) C08K 3/32 (2006.01) C08K 5/01 (2006.01) C08K 5/41 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2387571

The invention relates to a composition comprising, a) at least one oligomer, cooligomer, polymer or copolymer or blends thereof, containing a stable free nitroxyl radical (1); and b) a reducing agent; with the proviso that the composition is essentially free of a polymerizable monomer. A further subject is a process for improving the color of an oligomer, cooligomer, polymer or copolymer or blends thereof, containing a stable free nitroxyl radical (1); by adding a reducing agent to said polymer and heating said mixture to above the glass temperature in case of amorphous polymers or above the melting point in case of crystalline or semi-crystalline polymers.

L'invention se rapporte à une composition comportant: a) au moins un oligomère, un co-oligomère, un polymère ou un copolymère ou des mélanges de ces composés, contenant un radical (1) nitroxyle libre et stable; et b) un agent de réduction, à condition que la composition ne contienne sensiblement pas de monomère polymérisable. Une autre réalisation de l'invention concerne un procédé d'amélioration de la couleur d'un oligomère, d'un co-oligomère, d'un polymère ou d'un copolymère ou de mélanges de ces composés, contenant un radical (1) nitroxyle libre et stable, et consistant à ajouter un agent réducteur audit polymère et à chauffer ledit mélange à une température supérieure à la température de transition vitreuse dans le cas des polymères amorphes ou supérieure au point de fusion dans le cas de polymères cristallins ou semi-cristallins.

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