Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Biaxially oriented film
 A biaxially oriented film (1) which is substantially formed from a polyethylene naphthalate copolymer comprising ethylene-2,6-naphthalate units in an amount of 90 to 99.9 mol % based on the total of all recurring units and an isophthalic acid component or a decalin-2,6-dicarboxylic acid component in an amount of 0.1 to 10 mol % based on the total of all dicarboxylic acid components and which has (2) Young's modulus of 500 kg/mm.sup.2 or more in each of a longitudinal direction and a transverse direction, (3) a plane orientation coefficient of 0.230 to 0.275 and (4) a density of 1.350 g/cm.sup.3 or more. 
Teijin Limited
Y C G C Y B Y B G
Y10T C08J G11B C08J Y10S B29C Y10S B29K G03C
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Koji Ryoji Mitsuru Kenji Seiji Shinya Shinichi
Furuya Tsukamoto Teramoto Suzuki Ito Watanabe Kawai