P -hydroxybenzoic acid or p-hydroxybenzoate is added at the beginning of PET prepolymerization to decrease coagulate particle content of PET.

• 为了减少PET凝聚粒子,在PET聚合的预缩聚阶段,添加少量的对羟基苯甲酸甲酯或对羟基苯甲酸。