EASILY ADHESIVE POLYESTER FILM

PURPOSE:To provide a polyester film improved in thermal adhesiveness, water resistance, blocking resistance and transparency, hardly dissolved in an org. solvent and enhanced in the adhesiveness with a topcoat layer by applying a specific aq. coating solution to the single surface of the polyester film to heat and cure the same. CONSTITUTION:A compsn. consisting of 10-13.5 pts.wt. of a first urethane resin with a glass transition point of -10 to 30 deg.C and a flow start temp. of 60-95 deg.C, 1.5-5 pts.wt. of a second urethane resin with a glass transition point of 50-80 deg.C and a flow start temp. of 100-150 deg.C and 1-3 pts.wt. of a curing agent such as an aminoplast resin or an epoxy compd. is mixed with 50-110 pts.wt. of water to prepare an aq. coating soln. which is, in turn, applied to the single surface of a polyester film. After coating, the coated polyester film is dried pref. at 100-150 deg.C. By this method, crosslinking reaction is advanced and a continuous film is formed on the polyester film and this polyester film is taken up in a roll form.