PROCESS FOR THE PREPARATION OF AN AQUEOUS EMULSION OF A MIDBLOCK SULFONATED BLOCK COPOLYMER

    公开(公告)号:EP3126438B1

    公开(公告)日:2018-09-26

    申请号:EP15777217.9

    申请日:2015-04-01

    IPC分类号: C08J3/07

    CPC分类号: C08J3/07 C08J2353/00

    摘要: The present invention provides an aqueous emulsion and a process for preparing an aqueous emulsion of a midblock sulfonated styrenic block copolymer comprising at least two non-sulfonated polymer end-blocks A and at least one 5 sulfonated block B comprising the steps of providing a cement of a midblock sulfonated styrenic block copolymer in a non-polar solvent wherein the non-polar solvent is a hydrocarbon compound comprising from 5 to 12 carbon atoms with a boiling point of less than 100 degree Celsius or mixture of such compounds, mixing the cement with a co-solvent to form a mixture, emulsifying the mixture optionally in the 10 presence of an emulsifier with water to produce an emulsion, and removing the hydrocarbon solvent and optionally the co-solvent from the emulsion to produce the aqueous emulsion. The resulting emulsion of the midblock sulfonated styrenic block copolymer has relatively small particle diameters.