as an inorganic dispersant, hydroxyapatite is mainly used for the suspension polymerization of polystyrene (PS), expandable polystyrene (EPS) and SAN beads in ABS. the polymerization temperature and pressure change smoothly, and the material is not easy to contact the kettle, which can extend the cleaning cycle of the kettle and improve the appearance quality and transparency of the product. At the same time, the particle size distribution of polymerization products is also relatively concentrated, especially in the manufacture of crude resin products, which has greater advantages than organic dispersants such as hydroxyethylcellulose (HEC), polyvinyl alcohol (PVA), gelatin, sodium carboxymethylcellulose, etc.