METHOD FOR PRODUCING A FILM HAVING A NANO-STRUCTURE ON THE SURFACE OF THE FILM
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United States of America Patent
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Oct 4, 2013
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Oct 9, 2012
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Abstract
The present invention provides a method for producing easily a membrane (film) having a micro surface structure (porous structure, fibrous structure and the like) in nano-order. The present invention comprises a method for producing a film having a nano-structure on the surface of the film, comprising the steps of (1) coating a substrate with a solution containing a copolymer including two or more homopolymer segments and an organic solvent having boiling point of 82° C. or more and dielectric constant of 30 or less to form a membrane, (2) providing the membrane with a water vapor-containing gas having relative humidity of 50% or more to age the membrane, and (3) drying the membrane to obtain the film.
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