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    • 51. 发明专利
    • MANUFACTURE OF MICROPOROUS FILTER MEMBRANE
    • JPS62160109A
    • 1987-07-16
    • JP136686
    • 1986-01-09
    • FUJI PHOTO FILM CO LTD
    • SASAKI JUNNARUO KYOICHI
    • B29C67/06B01D71/68B29C71/02B29L7/00
    • PURPOSE:To increase filter efficiency of microporous membrane, enhance flow and offer a much longer life by casting and solidifying polymer solution melted in polar organic solvent and crosslinking swelling agent and heat-treated in the presence of water vapor after being dried. CONSTITUTION:Resin of polysulfone and fluorine bases, polyamide of aliphatic family and the like are solved in good solvent, mixed solvent of good and non-solvents and a mixture of several kinds of solvents carrying different dissolving degrees against polymer. Concentration is preferably 5-30 weight %, and 1-60 weight % of electrolytic water solution having 0.5-10 volume % against solvent may be added. The said raw liquid for preparing membrane is cast over the substrate, which is impregnated immediately after casting or after a specified time. The membrane thus prepared is dried and treated in the air containing water vapor at the temperature 100-180 deg.C for 10-20 miutes. Partial pressure of water vapor is preferably more than 0.05.By the said process, filter flow is increased while filter efficiency is maintained.