| 摘要 |
PURPOSE:A thermoplastic polyester harmless to human body and excellent in adhesiveness, heat stability and stretchability, comprising four kinds of structural units at a specified molar ratio. CONSTITUTION:A thermoplastic polyester having structural units of formulas I - IV(wherein R1 is a bivalent group derived by removing carboxyl groups from at least one dicarboxylic acid selected from the group consisting of terephthalic, isophthalic, orthophthalic, and a 4-10C linear aliphatic dicarboxylic acids, R2 is a monovalent group derived by removing a carboxyl group from at least one monocarboxylic acid selected from the group consisting of 6-30C aliphatic or alicyclic and 7-20C aromatic monocarboxylic acids, D is a bivalent group derived by removing hydroxyl groups form at least one diol selected from 2-10C aliphatic and 6-8C alicyclic diols, and m, n, p1-3 and q are each 0 or 1) and having an intrinsic viscosity >=0.5dl/g, wherein said components I -IV are present in amounts to provide molar ratios, I :II=1:1, I :III=1,000:1-50, and III: IV=4:1-40.
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