| 摘要 |
PURPOSE:To obtain the titled membrane having sufficiently high mechanical strength, smoothly and economically, by impregnating a (fluorinated) olefin polymer substrate with a monomer mixture containing styrene, chloromethylstyrene and divinylbenzene as the essential components. CONSTITUTION:A substrate made of an olefin polymer (e.g. polypropylene) and/ or a fluorinated olefin polymer (e.g. ethylene-tetrafluoroethylene copolymer) having a thickness of preferably 20-300mu (e.g. a cloth of 112mu thick and 44.2g/cm<2> weight) is impregnated with a monomer mixture containing three essential components consisting of styrene, chloromethylstyrene and divinylbenzene (preferably 10-80wt%, 10-80wt% and 1-25wt%, respectively), and containing a polymerization initiator (e.g. benzoyl peroxide). The impregnated substrate is irradiated in the former stage with ionizing radiation to effect the partial polymerization of the monomers at a conversion of <=80%, and then heated in the latter stage to effect the polymerization of the remaining part of the monomers. If necessary, the reaction to introduce ion exchange group is carried out during the above process.
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