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    • 8. 发明专利
    • Method for producing a porous film
    • JP5351477B2
    • 2013-11-27
    • JP2008239719
    • 2008-09-18
    • 富士フイルム株式会社
    • 晃寿 伊藤英数 山崎司 石原
    • C08J9/28B29C41/24B29K105/04B29L7/00
    • PROBLEM TO BE SOLVED: To provide a method for producing a porous film, for efficiently producing the porous film having fine pores in a range of 5 to 100 μm. SOLUTION: The method for producing the porous film 10 includes: a process for coating a support 12 with a coating liquid 35 by a coating die 51 to form a coating film 35a; the first humidification treatment process for leaving the coating film 35a in the first zone 61 in an atmosphere having the first dew point Td1 higher than the surface temperature Ts of the coating film 35a, shortening the first humidification treatment time to sparely form primary fine water drops 60a by dew condensation; the second humidification treatment process for leaving the coating film 35a in an atmosphere having the second dew point Td2 which is higher than the first dew point Td1 to quickly grow the primary fine water drops 60a into secondary fine water drop 60b; and a drying process for drying the coating film 35a to form a plurality of pores with the secondary fine water drops 60b as templates, thus forming the porous film 10. Thus, the porous film 10 is obtained having larger size fine pores than those of conventional porous films. COPYRIGHT: (C)2010,JPO&INPIT