Processing modifiers in the traditional sense almost specifically refer to modifiers used in the processing of rigid PVC to improve plasticizing properties, increase resin melt viscoelasticity and promote resin melt flow. Such additives are acrylic acid. Ester copolymer (ACR) is the main product, 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 the fields of polyolefins (such as linear low density polyethylene LLDPE), engineering thermoplastic resins, etc. It is expected that in the next few years, there will be newer and wider processing modifications after metallocene resins are put into use. Varieties of Sexual Agents.