反应详情

温度

60 °C

80 Parts of NISSEKI HIGHSOL N-296 (trademark for oil manufactured by Nihon Sekiyu Kagaku Co.) in which 4.0 parts of 3-diethylamino-7-chlorofluoran was emulsified in 100 parts of a 5% aqueous solution of pH 4.0 in which styrene-maleic anhydride copolymer was dissolved together with a small amount of sodium hydroxide. Separately, 10 parts of melamine, 25 parts of 37% aqueous formalin solution and 60 parts of water were adjusted to pH of 9.0 and heated to 60° C. to obtain a transparent melamine-formaldehyde precondensate in 15 minutes. This precondensate was added to the emulsion obtained above and this was stirred for 4 hours with keeping it at 60° C. and then was left to cool to room temperature. The resulting microcapsule dispersion had a solid concentration of 40%.