| 摘要 |
PURPOSE:To obtain a polyester with good lubricity, evenness, etc., by incorporating, during the polyester production process, a product prepared by blending terephthalic acid (derivative) with an alkali (alkaline earth) metal compound, phosphorus compound, and organic lubricating agent followed by heating treatment. CONSTITUTION:(A) Terephthalic acid (derivative) is dissolved, on heating, in >=20 molar times the terephthaloyl unit, of ethylene glycol. The resulting solution is incorporated, while stirring, with (B) 1-4 molar times the terephthaloyl unit, of an alkali (alkaline earth) metal compound (e.g. lithium acetate) followed by heating treatment of pref. 100-200 deg.C, and then adding (C) 1-4 molar times the terephthaloyl unit, of a phosphorus compound (e.g. phosphoric acid) and (D) 0.1-3wt. times the component B, of an organic lubricant (e.g. behenic acid) to the system followed by heating treatment, thus preparing a product as an additive. This additive is incorporated during the polyester production process e.g. before the polycondensation initiation, in such an amount as to be 0.005-0.5wt% calculated as the metal component in the component B, based on the polyester to be produced, thus obtaining the objective polyester.
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