Patent ID: 7931848

Claim:
A method of producing a solid body having a depressed portion on a surface, comprising: (a) providing a solution comprising (i) solvents consisting of a solvent A and a solvent B, and (ii) a polymer compound soluble in the solvent B, wherein the total mass of the solvent B is 50% or more of the total mass of the solvents consisting of the solvent A and the solvent B, the solvent A is diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, dipropylene glycol or polyethylene glycol 200, the solvent B is monochlorobenzene, and the polymer compound is polyarylate resin having the following structure: (b) solidifying the solution while forming a depressed portion on the surface of the solid body by condensation of water on the surface of the solution during a process in which either one or both of the solvent A and the solvent B contained in the solution evaporate.