METHOD FOR PURIFYING POROUS POLYAMIDE FINE POWDER

Disclosed is a method for advantageously remove a solvent A remaining in a porous polyamide fine powder which has been obtained by bringing a polyamide solution prepared by dissolving a polyamide in the solvent A into contact with a nonsolvent B for polyamides. Specifically, the solvent A is extract...

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Bibliographic Details
Main Authors SHOJI, TATSUYA, YAO, SHIGERU, ARIDOMI, TADATOSHI, ASANO, YUKIHIKO
Format Patent
LanguageEnglish
French
Japanese
Published 26.10.2006
Subjects
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Summary:Disclosed is a method for advantageously remove a solvent A remaining in a porous polyamide fine powder which has been obtained by bringing a polyamide solution prepared by dissolving a polyamide in the solvent A into contact with a nonsolvent B for polyamides. Specifically, the solvent A is extracted and removed from the porous polyamide fine powder by bringing a nonsolvent C for polyamides, which is compatible with the solvent A at least at a temperature not less than 40°C, into contact with the porous polyamide fine powder at a temperature not less than 40°C. La présente invention concerne un procédé pour retirer avantageusement un solvant A restant dans une fine poudre polyamide poreuse ayant été obtenue en mettant une solution polyamide préparée en dissolvant un polyamide dans le solvant A en contact avec un non-solvant pour polyamides B. Spécifiquement, le solvant A est extrait et retiré de la fine poudre polyamide poreuse en mettant un non-solvant pour polyamides C, lequel est compatible avec le solvant A au moins à une température n'étant pas inférieure à 40°C, en contact avec la fine poudre de polyamide poreuse à une température n'étant pas inférieure à 40°C.
Bibliography:Application Number: WO2005JP07347