| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a production method of a polyester composition that gives a fiber exhibiting improved color depth and vividness when the fiber is dyed, and to provide the fiber. Ž<P>SOLUTION: The production method includes a step of producing an oligomer by esterification in an esterification tank from a dicarboxylic acid component essentially comprising terephthalic acid and a diol component essentially comprising ethylene glycol, and a step of polycondensation of the oligomer in a polycondensation tank. The method is characterized in that: in a middle stage of the production process, an alkali metal-containing phosphorus compound and/or an alkaline earth metal-containing phosphorus compound, prepared by reacting a phosphate with a compound containing an alkali metal and/or an alkaline earth metal, in a proportion with respect to one mole of the phosphate, 0.5 to 3 times of moles when a compound containing an alkali metal is used, and 0.25 to 1.5 times of moles, when a compound containing an alkaline earth metal is used, is added in such a manner that the content rate of the above compound ranges from 0.1 to 5.0 wt.% with respect to the whole weight of the polyester composition; also in any stage of the production process, an ammonium compound or an amine compound in a specified amount with respect to the whole moles of the dicarboxylic acid component is added to the esterification tank or the polycondensation tank; and the theoretical average polymerization degree of the oligomer fed to the polycondensation tank is not more than 5. The polyester composition thus obtained and the fiber of the composition exhibit improved color depth and vividness when dyed. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
