| 摘要 |
PURPOSE:To produce a blending resin for PVC paste resins, comprising low- porosity single particles having a dense surface, by suspension-polymerizing a vinyl chloride monomer in the presence of a specified PVA and a hydrophilic nonionic surfactant as a suspension stabilizer. CONSTITUTION:In the suspension polymerization of vinyl chloride in the presence of a catalyst soluble in vinyl chloride monomer and a suspension stabilizer and, optionally, a pH-buffering agent; said suspension stabilizer comprises (A) PVA having an average degree of polymerization of 1000-2500, a degree of saponification of 60-85mol%, and a m.p. <= the polymerization temperature and (B) a hydrophilic nonionic surfactant (e.g., polyoxyethylene lauryl ether). It is suitable to use 0.1-2.0wt%, based on the monomer, component A and 0.1- 1.0wt%, based on the monomer, component B. Thus, a blending resin for PVC paste resins, which is used in conjunction with a PVC paste resin, and shows good flow when it is made into a plastisol (together with a plasticizer) and is excellent in the quality of a molding formed by heating this sol.
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