PURPOSE: To enable the production of the titled support having less tendency for generating edge stain by impregnated a base paper with an aqueous solution of a surface sizing agent.
CONSTITUTION: In the substrate for the titled paper coated with a resin on both surfaces of the base paper, said base paper is impregnated in an aqueous solution of the surface sizing agent having ≤50dyne/cm surface tension at 20°C. The surface sizing agent is preferably polyvinyl alcohol, and is used as an aqueous solution having 3W10wt% concentration. The method of impregnating the base paper is preferably effected by means of the on-machine sizing press or on-machine tube sizing method. To reduce the surface tension of the aqueous solution of the surface sizing agent upto ≤50dyne/cm at 20°C, it is preferable to mix an org. solvent which has a low boiling point and has compatibility with water, for example, alcohol to the aqueous solution of surface sizing agent.