TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The polyester is polyethylene-2,6-naphthalene dicarboxylate. The binder and fine particles have each 1.50-1.60 refractive index. The binder is a mixture of a polyester resin and an acrylic resin having an oxazoline gp. and a polyalkyleneoxide gp. The base film is made by the continuous film fabrication method and has at most 50 absolute value of surface directional refractive index difference coefficient (DELTAn), given by (I).Preferred Film: The film has at most 1% heat shrinkage at 230degreesC and 30 min. The film has 2-20 nm both-sides surface 3 dimensional center line average roughness (SRa) and 50-150 nm 10-pt. average roughness (Rz) for at least one surface. The film has 3-15 GPa Young's modulus. nMD, nTD = refractive index of film in the fabrication direction and perpendicular to this, respectively. EXAMPLE - 100 pts.wt. dimethyl naphthalene-2,6-dicarboxylate, 60 pts.wt. ethylene glycol and 0.03 pt.wt. Mn acetate.4H2O salt were heated from 150degreesC to 238degreesC over 120 min, adding 0.024 pt.wt. SbO3 at 170degreesC, then 0.023 pt.wt. trimethylphosphate (dissolved in ethylene glycol at 135degreesC for 5 h at 0.11-0.16 MPa) added, heated to 290degreesC, the pressure reduced to at most 27 Pa, and polycondensation carried out, to give polyethylene-2,6-naphthalenedicarboxylate (intrinsic viscosity = 0.61 dl/g). This was dried at 170degreesC for 6 h, melted at 305degreesC, filtered, and extruded, to give an unstretched film. The film was stretched longitudinally x3.1 using a 900degreesC infrared heater, one surface coated with a coating solution comprising 67 wt.% polyester (comprising an acid component of 63 molar% 2,6-naphthalene carboxylic acid, 32 molar% 2-isophthalic acid and 5 molar% 5-sodium sulfinephthalic acid, and a glycol component of 90 molar% ethylene glycol and 10 molar% diethyleneglycol; average mol. wt. = 12000), 20 wt.% acrylic aq. dispersion (solids = 25%; comprising 30 molar% methylmethacrylate, 30 molar% 2-isopropenyl-2-oxazoline, 10 molar% polyethyleneoxide(n = 10)methacrylate and 30 molar% acrylamide), 3 wt.% silica-titania fine powder 10% aq. dispersion (refractive index = 1.56), 5 wt.% wax and 5 wt.% polyoxyethylene(n = 7)lauryl ether (binder refractive index = 1.57), and dried, to give a 0.1 mum thick film. This was stretched transversely x3.2 at 145degreesC, and heat treated at 240degreesC for 40 s, to give a 200 mum thick laminated polyester film. The film had 1.0% haze, 87% total light transmittance, 11 nm SRa, 100 nm Rz, -1 DELTAn, 5.8 GPa Young's modulus, good sliding property and good coating adhesion.