反应详情

温度

70 °C

8.1 g of an emulsifier (trade name: PIONIN A-43S, manufactured by Takemoto Oil and Fat Co) and 236.0 g of distilled water were charged to a one liter three-necked flask equipped with a stirrer and a tubular reflux cooler and stirred under a nitrogen gas stream with heating at 70° C. 6.2 g of styrene, 3.5 g of n-butyl acrylate, 0.3 g of acrylic acid, 1.0 g of ammonium persulfate, and 40 g of distilled water were added and, after stirring for 30 min, a monomer solution comprising 117.8 g of styrene, 66.5 g of n-butyl acrylate, and 5.7 g of acrylic acid was dropped at an equal speed such that dropping was completed in 2 hours. After the completion of dropping, an aqueous solution comprising 0.5 g of ammonium persulfate and 20 g of distilled water was added and, after stirring at 70° C. for 4 hours, temperature was elevated to 85° C. and stirring was continued for further 2 hours. By cooling and filtering the reaction solution, an aqueous solution of styrene/butyl acrylate/acrylic acid (=62/35/3) copolymer BH-1 was obtained.

1. customequipped with a stirrer
2. stirringafter stirring for 30 min
3. additionwas dropped at an equal speed such
4. additionwas added
5. stirringafter stirring at 70° C. for 4 hours
6. customwas elevated to 85° C.
7. stirringstirring
8. waitwas continued for further 2 hours
9. temperatureBy cooling
10. filtrationfiltering the reaction solution