| 摘要 |
<p>An improved method for producing multiply-branched polyester comprising condensing a reactant having the general formula Z<1>-Ar-(Z<2>)j, wherein j is 2 or 3, Ar is an aryl or heteroaryl group having from 1 to 3, solitary or linked or fused, five or six membered rings, and one of Z<1> and Z<2> is a carboxyl group and the other is is a group having the general formula <CHEM> wherein R is an alkyl group having from 1 to 3 carbon atoms, X is selected from the group consisting of fluoro and chloro and g is an integer from 0 to 7. <IMAGE></p> |
