Polyvinyl chloride (PVC) paste resin is a type of polymer material that belongs to the vinyl polymer family. It is produced through the polymerization of vinyl chloride monomers. PVC paste resin is known for its versatility and is widely used in various applications due to its unique properties. 

PVC paste resin is primarily composed of repeating vinyl chloride units, which are linked together through polymerization. The chemical formula of PVC is (C2H3Cl)n, where n represents the number of repeating units in the polymer chain.

PVC paste resin typically appears as a fine white powder with a smooth texture. It is odorless and relatively stable at room temperature. The resin can be easily molded into various shapes when heated.