反应详情

50 g of deionized water and 211 g of Aerosol A-103 (34% solid content) are mixed in a 3 liter, four-neck resin kettle and mechanically stirred for 30 minutes under the atmosphere of nitrogen gases. The monomer mixture is obtained by the addition of 585 g of styrene 225 g of butyl methacrylate, and 90 g of methyl methacrylate in a 2 liter Erlermeyer flask with magnetic stirring. 168 g this monomer mixture is then slowly added into the 3 liter resin kettle within a one hour period through a 250 ml separatory funnel with a drop-regulator (FIGS. 1, 2 and 3). After the addition of 20 ml of 20% aqueous ammonium persulfate (containing 8% aerosol A-103) and 20 ml of 20% sodium metabisulfite(containing 8% aerosol A-103) the temperature is raised to 70° C. The rest of the monomer mixture, 732 g, is then slowly added to the reaction emulsion within 5 hours period while bubbling of nitrogen gases and mechanical stirring (400 rpm) are continuing. The polymerization is completed after heating the reaction mixture for 1.5 hours at 75° C. The final product is slowly cooled to room temperature. An emulsion polymer is obtained with a weight of 1200 g. This emulsion polymer have solid content around 74%.