COMPOSITIONS FOR IMPROVING POLYESTERS

摘要

A method for altering the melt characteristics of a polyester, such as the melt strength, the method comprising the step of melt mixing the polyester, with a tetracarboxylic dianhydride; across-linker and chain extender comprising at least two groups being able to react with a carboxy group and a phenolic hydroxyl group;and a poly functional compound comprising at least two groups selected from the group consisting of non-sterically hindered phenolic hydroxyl groups, and carboxy groups.