The processing modifier in the traditional sense almost specifically refers to the modifier used in the processing of rigid PVC to improve the plasticizing performance, increase the viscoelasticity of the resin melt and promote the melt flow of the resin. Such additives are acrylic acid Mainly ester copolymer (ACR), which plays a prominent role in the processing of rigid PVC products. The concept of processing modifiers in the modern sense has been extended to polyolefins (such as linear low-density polyethylene LLDPE), engineering thermoplastic resins and other fields. It is expected that newer and more extensive processing changes will occur after metallocene resins are put into use in the next few years. Varieties of sex agents.