Multilayer film and manufacturing method thereof
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United States of America Patent
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Apr 23, 2013
Grant Date -
Dec 16, 2010
app pub date -
Feb 18, 2009
filing date -
Feb 19, 2008
priority date (Note) -
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Abstract
According to a manufacturing method of a multilayer film according to one aspect of the present invention, at the step of applying a coating liquid prepared by dissolving a plurality of monomers or polymers in at least one solvent onto a substrate and subsequently drying the coating liquid, the solvent is allowed to penetrate into the substrate at a specified speed. This causes concentration distribution of the solvent within the coated layer in the thickness direction thereof, and thus a multilayer film separated into an upper layer and a lower layer can be formed by one coating. Accordingly, a multilayer film having a different function in each layer can be formed by one coating.
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