| 摘要 |
Preparing a polyester or copolyester, comprises (a) mixing at least one aliphatic dicarboxylic acid having 2-12C and/or its anhydride, at least one aliphatic alcohol having 2-12C and at least two hydroxyl functionalities, and dissolving dicarboxylic acid in dialcohol to obtain a solution by increasing the temperature, (b) reacting the obtained solution by adding it to an esterification product obtained by reacting at least one aliphatic dicarboxylic acid with at least one aliphatic alcohol, and (c) polycondensing or copolycondensing the obtained reaction product under reduced pressure. Preparing a polyester or copolyester, comprises (a) mixing at least one aliphatic dicarboxylic acid having 2-12C and/or its anhydride, at least one aliphatic alcohol having 2-12C and at least two hydroxyl functionalities, and dissolving dicarboxylic acid in dialcohol to obtain a solution by increasing the temperature, (b) adding the above obtained solution to an esterification product containing at least one diester and/or at least one oligoester, which is obtained by reacting at least one aliphatic dicarboxylic acid with at least one aliphatic alcohol, and reacting, and (c) polycondensing or copolycondensing the reaction product obtained in the step (b) under reduced pressure compared to normal conditions. |
