| 摘要 |
PURPOSE:To obtain the titled molded product, having a specific reduced viscosity, glass transition point and total light transmittance, excellent transparency and flexibility and capable of being laminated on other materials, by copolymerizing plural dicarboxylic acid components with plural glycol components. CONSTITUTION:(A) (i) 80-100mol.% terephthalic acid and (ii) 0-20mol.% other dicarboxylic acids (e.g. phthalic acid) as dicarboxylic acid components and (B) (i) 50-95mol.% ethylene glycol, (ii) 5-50mol.% alkylene oxide adduct of bisphenol A and (iii) 2-10mol.% polytetramethylene glycol as glycol components are subjected to polycondensation reaction to afford a copolyester, having >=0.4dl/g reduced viscosity and >=20 deg.C glass transition point, which is then molded into the form of sheet having 0.1mm thickness in an extruder, etc., to afford the aimed molded product having >=80% total light transmittance after aging at 60 deg.C for 5 days.
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