2.Synthetic resin: in the production of synthetic resins, such as polyvinyl chloride (PVC), polyvinylidene chloride and other copolymers, suspension polymerization is the most commonly used and must stabilize hydrophobic monomers suspended in water. As a water-soluble polymer, hydroxypropyl methyl cellulose (HPMC), the most representative of cellulose ether series products, has excellent surface activity, and ACTS as a colloidal protective agent, which can effectively prevent polymeric particles from agglomerating. Furthermore, although HPMC is a water-soluble polymer, it is also slightly soluble in hydrophobic monomers, and increases the porosity of monomers in the production of polymerized particles, which provides the polymer with a good ability to remove residual monomers and improve the absorption of plasticizers.