| 摘要 |
PURPOSE:To obtain a polyester, having improved surface characteristic and suitable for films, etc., by blending terephthalic acid (derivative) with an alkali (earth) metal compound and wax, heat-treating the resultant blend and adding the heat-treated blend to a synthetic reaction system of the polyester. CONSTITUTION:(A) Terephthalic acid (derivative) is blended with ethylene glycol in a molar amount of, e.g. 20 times or more based on the component (A), and further blended with (B) an alkali (earth) metal compound, e.g. lithium acetate, in a molar amount of 1-4 times based on the component (A) and (C) wax in an amount of wt% of 0.1-3.0 times based on the component (B). The resultant blend is heat-treated, preferably at 100-200 deg.C while stirring to give an additive, which is then added to a synthetic reaction system of a polyester before starting polycondensation reaction so that the amount of the component (B) expressed in terms of metal component based on the formed polyester may be preferably 0.005-0.5wt% to carry out the polycondensation and afford the aimed polyester.
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