| 摘要 |
PURPOSE:To obtain in high productivity a modified polyester readily dyeable with basic dye with reduced foreign substances in the final polymer, by incorporating a specific amount of an aromatic carboxylic acid compound in sulfonic acid compound-copolymerized polyester. CONSTITUTION:An esterification or ester interchange reaction is carried out between. (A) an acid component (e.g., terephthalic acid) and (B) a glycol. Before the completion of the above reaction, (C) 0.5-10mol%, based on the component (A), of a sulfonic acid compound of formula I (R1 and R2 are each H or 1-4C alkyl; M is Na, Li, K, etc.) is brought to copolymerization; and furthermore, at such a pint that a conversion of 70% or higher has been reached, (D) aro matic carboxylic acid of formula II (R3 and R4 are each H, 1-4C alkyl, etc.) and/or formula III (R5 and R6 are each 1-4C alkyl) (e.g., benzaic acid) is added to the system is such an amount as to satisfy the equation IV (A is total mole number for both components (C) and (D); S is mole number for the component (B)) to perform polycondensation, thus obtaining the objective polyester.
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