Patent ID: 7387824

Claim:
A paper base support for an image recording medium comprising: base paper; a polymer coating layer formed on each of a top surface and a wire side surface of said base paper; and a coating layer containing a pigment, an adhesive agent, a water resisting agent and a water repellent additive which is formed under said polymer coating layer on at least one of said top surface and said wire side surface; wherein said water resisting agent is selected from the group consisting of ethylene-vinyl acetate copolymers, vinylidene chloride copolymers, ammonium zirconium carbonate, melamine-formaldehyde resins, ketone-aldehyde resins, and aldehyde starches; and wherein said paper base support has a water absorbance less than 20 mg in terms of water absorption quantity of cross section (mg) given by the following expression: water absorption quantity of cross section (mg)= A−B where A is the mass of a 10×1.5 cm paper base support after wiping off attached water after five minute immersion in a water bath at 20° C. and B is the mass of the paper base support before immersion.