According to one embodiment, an interconnect switch has an optical switch fabric having N input ports and N output ports. Also a block of a second layer of an image corresponding the block of the first layer is obtained. The acrylic emulsion polymer is formed from constitutive monomers essentially including a acrylic alkyl ester, a carboxyl-containing unsaturated monomer, and at least one monomer selected from methyl methacrylate, vinyl acetate, and diethylacrylamide and has a solvent-insoluble content of 70 percent by weight or more.