| 摘要 |
PURPOSE:To obtain the title polymer which can give moldings such as films and fibers excellent in surface smoothness and slidability without troubles, by transesterifying a dicarboxylic acid (derivative) with a glycol in the presence of a specified long-chain alkyl group-containing esterifiable compound. CONSTITUTION:100pts.wt. dicarboxylic acid (derivative) (A) [e.g., terephthalic acid (dimethyl ester)] is transesterified with, e.g., 70pts.wt. glycol (B) (e.g., ethylene glycol) and 0.001-30wt% (based on the polyester) 6C or higher long-chain alkyl group-containing esterifiable compound (C) selected from among an aliphatic carboxylic acid anhydride (e.g., 2-octadecylsuccinic anhydride), a lactone (e.g., tau-stearolactone) and an epoxide (e.g., 1,2-eicosylene oxide) in the presence of, optionally, external or internal particles (D) such as calcium carbonate, TiO2 and silica.
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