| 摘要 |
PURPOSE:To enhance transparency and easy slidability and to prevent the generation of a Newton ring by using particles of a specific org. polymer as particles added to a coating layer. CONSTITUTION:A coating layer based on org. polymer particles having a refractive index of 1.2 - 1.8 and a water-soluble or water-dispersible resin is provided to at least the single surface of a polyester film and the ratio (D/d) of the mean particle size D of the org. polymer particles and the thickness (d) of a coating layer is set to a range of 1.1 - 8.0 and the mean particle size D of the org. polymer particles is set to 0.8mum or more and the addition amount thereof is set to 0.1 - 20wt.%. Further, the center line mean roughness of the outer surface of the coating layer is set to 0.2mum. As the org. polymer particles, particles of a divinyl benzene/styrene copolymer (crosslinked), polyimide and a silicone resin are designated. The water-soluble or water-dispersible resin may be dissolved or dispersed in water and a urethane resin, a polyester resin, polyvinyl alcohol, a vinyl resin, a copolymer thereof and an acrylic resin can be designated. |
