FINE FOAM-CONTAINING LAMINATED POLYESTER FILM FOR PHOTOGRAPHIC PRINTING PAPER

摘要

PROBLEM TO BE SOLVED: To obtain a lightweight base film for photographic printing paper having an undercoat layer excellent in adhesion to gelatin and having cushioning property, surface smoothness and high whiteness. SOLUTION: This laminated film has a coating layer on one face of a film base contg. a structure obtd. by laminating a polyester A layer having >1.30 g/cm<3> density on one face or both faces of a polyester B layer contg. fine closed cells and having 0.40-1.30 g/cm<3> density. The b value of one face of the film base is <2.0, the surface roughness Ra is 0.030-0.50μm and the face is composed of the polyester A layer. The surface roughness Ra of the other face of the film base is higher than the Ra of the above-mentioned surface. The surface having the lower Ra out of the both surfaces is coated with a coating soln. contg. aq. polyurethane and aq. epoxy group-conthg. compd. in a dry weight ratio of 19:90 to 80:20 and is dried.