| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a novel flame retardant transparent copolymerized polyethylene naphthalate composition excellent in flame retardancy and transparency, and further chemical resistance and surface hardness. <P>SOLUTION: The copolymerized polyethylene naphthalate composition is obtained by copolymerizing a specific phosphorus compound composed of a cyclic phophinic acid derivative, wherein the intrinsic viscosity of the copolymerized polyethylene naphthalate is≥0.50 dL/g; the content of a phosphorus atom in the copolymerized polyethylene naphthalate composition is 10,000 to 13,000 ppm; and 10 to 200 mmol% of the phosphorus compound composed of a specific carboalkoxyphosphinic acid derivative is contained with respect to a divalent carboxylic acid constituting the copolymerized polyethylene naphthalate. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
