Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

80 parts of an oligoester acrylate type photosetting resin (trade name "Aronix" available from Toagosei Checmical Industries Co., Ltd.) in which 2.4 parts of 3-(4-diethylamino-2-ethoxyphenyl)-3-(1-ethyl-2-methylindole-3-yl)-4-azaphthalide, used as electron donative compound serving as reactant, and 0.2 part of benzoinethyl ether were dissolved was emulsified in 100 parts of a 5% aqueous solution (pH 4.0) of a styrene-maleic anhydride copolymer and a minority of sodium hydroxide. On the other hand, 10 parts of melamine, 25 parts of a 37% formaldehyde solution and 65 parts of water were mixed and this mixture was adjusted to pH 9 with sodium hydroxide and heated to 60° C., whereupon the mixed solution became transparent in 15 minutes to form a melamine-formalin precondensate. This precondensate was added to the above-said emulsion, stirred for 4 hours at a liquid temperature of 60° C. and then cooled to room temperature. The resultantly obtained microcapsule dispersion had a solid content of approximately 45%.

Provenance & Evidence