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    • 2. 发明授权
    • Method of recovering polymer agglomerates as dry powders or granules
    • 以干燥粉末或颗粒形式回收聚合物附聚物的方法
    • US4997911A
    • 1991-03-05
    • US241178
    • 1988-09-07
    • Hideo YasuiWataru OkadaYasuhiro MikiToragoro Mitani
    • Hideo YasuiWataru OkadaYasuhiro MikiToragoro Mitani
    • C08F6/22C08J3/16
    • C08J3/16C08F6/22
    • The present invention provides a method for recovering polymer agglomerates in the form of dry powders or granules comprising steps of:(A) coagulating a polymer latex obtained by emulsion polymerization or suspension polymerization to thereby form hydrous agglomerates in which latex particles are not fused together,(B) immersing the hydrous agglomerates in an organic liquid insoluble or hardly soluble in water which wets but does not dissolve or swell said agglomerates at a temperature lower than the temperature at which the latex particles constituting the agglomerates are fused together, to thereby substitute said organic liquid for the water contained in the agglomerates with the organic liquid,(C) thereby forming two phases; a water phase expelled from the agglomerates and an organic liquid phase in which the agglomerates are immersed,(D) separating the agglomerates from the organic liquid phase, and(E) removing by evaporation the organic liquid attached to the agglomerates, whereby the agglomerates are recovered as dry particles. Further, this invention provides a method of recovering polymer agglomerates having additional impurities removed therefrom by immersing the aforementioned agglomerates, after having been separated from the organic liquid phase, in a second organic liquid which effects dissolution and extraction of impurities from the aforementioned agglomerates. According to this invention, the drying energy may be greatly cut back, and high purity polymer agglomerates are obtained in the form of dry powders or granules.