Mitigation of the melt viscosity of poly(butylene terephthalate) by addition of aminobenzoic acids

Poly(butylene terephthalate) (PET) was blended with a very small amount of aminobenzoic acids (AMA) in a 20 mm single screw extruder. The melt viscosity of the extruded molds was mitigated by the addition of AMA, although their intrinsic viscosity, mechanical properties, and thermal properties were similar to those of each original PET. AMAs were thus found to be excellent additives for improving the molding processability of PET.