The present invention provides a layered product having a
porous layer made mainly of a
polymer on a base, and a process for producing the same; and a functional layered product wherein a pattern of a functional material, such as an conductive material, is formed onto a light-transmitting base using the layered product having the
porous layer, and a process for producing the functional layered product. A layered product comprising a base and a
porous layer on at least one surface of the base, wherein the porous layer is constituted of a composition containing a
polymer as a main component, the porous layer has micropores having an average
pore diameter of 0.01 to 10 μm, and has a
porosity of 30 to 85%, the composition constituting the porous layer has a
glass transition temperature of 20° C. or higher, and the porous layer is a layer which is
convertible to a transparent layer by a heat treatment through disappearance of the micropores. A conductive pattern is formed on the porous layer surface of the layered product, and then the
resultant layered product is subjected to a heat treatment to cause the micropores in the porous layer to disappear, thereby converting the porous layer to a transparent layer.