PVC is a very special thermoplastic. Its pure resin is easy to decompose during processing, has poor fluidity, low impact strength, and poor weather resistance. Therefore, various auxiliary materials need to be added during processing to improve its performance. Such as: lubricants, heat stabilizers, impact modifiers, processing aids, etc. In the process of development and application of processing aids, the product components are roughly divided into the following categories: methyl methacrylate (MMA)/acrylate copolymer, MMA/styrene copolymer, acrylonitrile/styrene, etc. The most used and effective is MMA/acrylate copolymer.