| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of preparing a modified polyester. <P>SOLUTION: The method includes: esterifying a dioic acid, diol, and a branching agent having at least three carboxyl groups at about 180 to 300°C and at pressure of about 1 to 4 bar; and subjecting the resultant product obtained by the esterification to condensation polymerization with diamine at pressure of smaller than about 0.01 bar, thereby obtaining the modified polyester. <P>COPYRIGHT: (C)2013,JPO&INPIT |
