| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve high barrier properties by forming polymer from thermoplastic resin material containing polyglycolic acid having a repeating unit represented by a specific chemical formula, and specific ranges of melt viscosity, melting point, melt enthalpy and density of non-orientated crystallized material. SOLUTION: Polyglycolic acid is of polymer containing repeating unit represented by a specific chemical formula, and a ratio of the repeating unit in the polymer is preferably 80 wt.% or more. And, melt viscosityηmeasured at temperature (Tm f 20'C) and shearing velocity of 100/sec is 500 to 100,000 Pa.s, and a melting point Tm is 180 deg.C or higher. Further, melt enthalpyΔHm is 20 J/g or more, and density of non-orientated crystallized material is 1.50 g/cm<3> or more. Thus, it is soil decomposable, has high oxygen and carbon dioxide gas barrier properties and improves mechanical strength, heat resistance and moistureproof line.</p> |
