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    Selective ion-permeable membranes
    3.
    发明授权
    Selective ion-permeable membranes 失效
    选择性离子渗透膜

    公开(公告)号：US2867575A

    公开(公告)日：1959-01-06

    申请号：US45272954

    申请日：1954-08-27

    Applicant: STAMICARBON

    Inventor： DE JONG GEERT J

    IPC: C08J5/22

    CPC classification number: C08J5/2218

    Abstract: A selective ion-permeable membrane comprising a hydrophilic sheet of a synthetic ionexchange polymer having an integral hydrophobic margin of the same polymer as the sheet but containing no ionogenic groups is produced by subjecting a hydrophobic sheet of polyethylene to a chemical treatment, e.g. with a liquid to introduce ionogenic groups into the sheet, the margin being either protected from the liquid, e.g. by being held out of contact therewith, or by being thicker than the rest of the sheet whereby an untreated core is left in the margin. In an example, a strip of polyethylene is passed continuously through chlorosulphonic acid, e.g. at 30 DEG C. to 40 DEG C., the edges of the strip being upturned to avoid contact with the acid. Specification 747,948 is referred to.

    Selective cation-permeable barriers
    7.
    发明授权
    Selective cation-permeable barriers 失效
    选择性阳离子可渗透屏障

    公开(公告)号：US2858264A

    公开(公告)日：1958-10-28

    申请号：US45272854

    申请日：1954-08-27

    Applicant: STAMICARBON

    Inventor： DE JONG GEERT J

    IPC: C08J5/22

    CPC classification number: C08J5/2243 ,  C08J2323/04

    Abstract: A selective ion-permeable membrane comprising a hydrophilic sheet of a synthetic ionexchange polymer having an integral hydrophobic margin of the same polymer as the sheet but containing no ionogenic groups is produced by subjecting a hydrophobic sheet of polyethylene to a chemical treatment, e.g. with a liquid to introduce ionogenic groups into the sheet, the margin being either protected from the liquid, e.g. by being held out of contact therewith, or by being thicker than the rest of the sheet whereby an untreated core is left in the margin. In an example, a strip of polyethylene is passed continuously through chlorosulphonic acid, e.g. at 30 DEG C. to 40 DEG C., the edges of the strip being upturned to avoid contact with the acid. Specification 747,948 is referred to.

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