Formaldehyde → Melamine formaldehyde

Participants

Reaction Steps

Separately from the above, commercially available melamine powder was added to an aqueous 37% formaldehyde solution, and the pH of the mixture obtained was adjusted to 9.0 using a sodium hydroxide solution, followed by heating at a water temperature of 60° C. for 30 minutes to obtain a melamine-formaldehyde prepolymer. The melamine-formaldehyde prepolymer was added to the O/W emulsion previously prepared, and the mixture obtained was heated so as to have a water temperature of 50° C. while stirring at 100 to 300 r.p.m. by means of an agitating homomixer. This state of heating was maintained for 5 hours, and thereafter the pH of the mixture was adjusted to 7, followed by cooling to room temperature. Thus, a cyan (C) capsule slurry in which the above composition was encapsulated therein and whose shells (walls) were formed of melamine-formaldehyde resin were obtained by the in-situ polymerization.

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