METHOD FOR PRODUCING POLYSTYRENE LATEX AND POLYSTYRENE LATEX

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a polystyrene latex whereby a large particle size averaging >0.5μm and <3μm is obtained by using a styrene containing a monofunctional or polyfunctional monomer capable of radical copolymerizing with the styrene and the attachment within the reaction vessel and the formation of the coagulation as a byproduct are little, and to provide the polystyrene latex. SOLUTION: The method performs the emulsion polymerization using a styrene containing the polyfunctional monomer of >=0.5 mol% and <=10 mol% with respect to the styrene and a nonionic surfactant having HLB value of >=10.0 and <=17.0 and the cloud point of the polymerization temperature or more and the temperature of +15 deg.C or less in an aqueous medium, and the polystyrene latex.