Nitric Acid → Styrene acrylic acid copolymer

Participants

Reaction Conditions

Reaction Steps

280 parts of styrene, 120 parts of n-butyl acrylate and 8 parts of acrylic acid are mixed and dissolved, and put in a flask together with 6 parts of a nonionic surfactant (trade name: NONIPOL 400, manufactured by Sanyo Chemical Industries, Ltd.) and 12 parts of anionic surfactant (trade name: NEOGEN SC, Dai-ichi Kogyo Seiyaku Co., Ltd.), which are dissolved in 550 parts of ion exchange water, and the mixture is dispersed and emulsified. While slowly mixing for 10 minutes, 50 parts of ion exchange water in which 3 parts of ammonium persulfate is dissolved is put in the mixture and, after performing nitrogen-substitution, the mixture is heated to 70° C. in an oil bath while agitating, and in the same condition emulsion aggregation is continued for five hours. Thereafter, the pH in the system is adjusted to 12.5 with a 0.5 mol/l aqueous solution of sodium hydroxide and treatment is carried out at 96° C. for six hours. The pH is then adjusted to 3.0 with a nitric acid aqueous solution and the solid content of the mixture is further adjusted, thereby obtaining a styrene/acrylic acid resin dispersion (E2) having a volume average particle diameter of 105 nm, glass transition temperature of 53° C., weight average molecular weight of 550,000 and a solid content of 40%.

Provenance & Evidence