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|1. (WO2018079525) FUNCTIONAL FILM|
|Applicants:||DAIKIN INDUSTRIES, LTD.
Provided is a functional film which has a desired microrelief pattern structure, while having excellent antifouling properties, water repellency and oil repellency, and wherein the characteristics of a resin serving as a base material that imparts the functional film with a function are sufficiently exhibited. This functional film comprises a layer (A) that contains a resin and a layer (B) that contains a compound having a perfluoropolyether group, and is characterized in that: a surface of the layer (B) has a microrelief pattern structure, said surface being on the reverse side of the layer (A)-side surface; relational expression (1) is satisfied in cases where an elemental analysis is carried out by X-ray photoelectron spectroscopy, while etching the functional film from the layer (B) side by means of an argon gas cluster ion beam; and relational expression (2) is satisfied in cases where the carbon 1s spectrum is measured by X-ray photoelectron spectroscopy, while etching the functional film from the layer (B) side by means of an argon gas cluster ion beam. Relational expression (1): D1 < 2 × X1 (In the formula, X1 represents the film thickness (nm) of the layer (B); and D1 represents the depth (nm) at which the fluorine atom concentration falls to 1 atom% or less.) Relational expression (2): D2 < 2 × X1 (In the formula, X1 represents the film thickness (nm) of the layer (B); and D2 represents the depth (nm) at which a peak is not detected within a binding energy range of from 290 eV to 300 eV.)