| 摘要 |
PURPOSE:To produce a polymer of a narrow particle diameter distribution width, by dispersing a styrene monomer in an aqueous medium containing a specified dispersant system and suspension-polymerizing the dispersion in the presence of a specified polymerization initiator. CONSTITUTION:A styrene monomer (e.g., styrene) is dispersed in an aqueous system containing a dispersant system comporising a combination of an anionic surfactant, a sparingly water-soluble inorganic salt (e.g., calcium phosphate) and a water-soluble metal salt which reacts alkaline in an aqueous system (e.g., NaCl), and the dispersion is suspension-polymerized in the presence of tert- butyl peroxy(2-ethylhexanoate) as a polymerization initiator. It is thus possible to obtain polymer particles having a particle diameter distribution which is markedly narrower than that of particles obtained by a well-known process without to heat resistance, transparency, and mechanical strength and without any increase in the COD load of the waste polymerization solution.
|
