| 摘要 |
PURPOSE:To improve the sanitary property of a porous sulfonated polyethylene film without deteriorating the performance of the film, by treating the film with an aqueous solution of a hypohalite. CONSTITUTION:A porous sulfonated polyethyene film is treated with an aqueous solution containing a hypohalite. The above-mentioned film preferably has 0.05- 2 milliequivalents/g, expressed in terms of exchange equivalent, sulfone groups present on the outside of the film and pore surface and further 0.05-1mum average pore diameter and 30-85% porosity. Sodium hypochlorite is preferred for the hypohalite, and used as an aqueous solution adjusted to 5-9pH and 0.5- 3wt% concentration. The treatment is preferably carried out at 50-80 deg.C for 10-120min, preferably 30-60min.
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