| 摘要 |
PURPOSE:To obtain a film, excellent in thermal stability and having practically sufficient tensile strength. CONSTITUTION:The objective film is molded by using a high-molecular weight aliphatic polyester obtained by reacting (1) 100 pts.wt. polyester, prepared by reacting three components of (a) a glycol component (e.g. ethylene glycol) with (b) an aliphatic (including a cycloaliphatic) dicarboxylic acid (or its acid anhydride) component (e.g. succinic acid) and (c) pentaerythritol and having >=10,000 number-average molecular weight, terminal groups substantially composed of hydroxyl groups and >=60 deg.C melting point with (2) 0.1-3 pts. wt. polyfunctional isocyanate (e.g. hexamethylene diisocyanate) in a molten state at >= the melting point of the polyester. |
