Methacrylic Acid → Methacrylic Acid

Participants

Reaction Conditions

Reaction Steps

Into a reaction vessel to which a stirring rod and a thermometer had been set, 683 parts by mass of water, 14 parts by mass of sodium salt of sulfuric acid ester of ethylene oxide adduct of methacrylic acid (“ELEMINOL RS-30,” product of Sanyo Chemical Industries Ltd.), 137 parts by mass of styrene, 55 parts by mass of butyl acrylate, 83 parts by mass of methacrylic acid, 8 parts by mass of n-dodecymercaptan (“THIOKALCOL 20,” product of Kao Corporation) and 1.2 parts by mss of ammonium persulfate were charged, and then stirred at 400 rpm for 15 min to thereby obtain a white emulsion. The resultant emulsion was heated to a system temperature of 75° C. and was allowed to react for 4 hours. Then, 30 parts by mass of a 1% by mass aqueous ammonium persulfate solution was added thereto, followed by aging at 71° C. for 6 hours, to thereby obtain an aqueous dispersion liquid (fine organic resin particle dispersion liquid (1)) of vinyl resin particles (copolymer of styrene-methacrylic acid-sodium salt of sulfuric acid ester of ethylene oxide adduct of methacrylic acid). The solid content concentration of the obtained fine organic resin particle dispersion liquid (1) was found to be 30% by mass. Some of the fine organic resin particles contained in the fine organic resin particle dispersion liquid (1) were dried to isolate the resin. The isolated resin was then measured for glass transition temperature (Tg) and weight average molecular weight (Mw), which were found to be 90° C. and 8,000, respectively.

Provenance & Evidence