| 摘要 |
<p>Provided is a method for producing a flame-retardant polyester which contains phosphorous at a high concentration through copolymerization, has a high degree of polymerization, a low degree of copolymerization of a diethylene glycol component, and rarely undergoes discoloration. A method for producing a flame-retardant polyester, comprising a step of agitating a composition comprising components (A) to (E) mentioned below while heating: (A): a phosphorous compound represented by general formula (1); (B): an unsaturated dicarboxylic acid or an ester-forming derivative thereof; (C): a saturated aliphatic polyhydric alcohol mainly composed of ethylene glycol and/or an ester-forming derivative thereof; (D): a polycarboxylic acid other than the component (B) or an ester-forming derivative thereof; and (E): an acetic acid metal salt.</p> |
