Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

Apart from the above, melamine powder was added to an aqueous solution of 37% formaldehyde. This was controlled to have a pH of 9 with an aqueous solution of sodium hydroxide added thereto, and then heated at 60° C. for 30 minutes to obtain a melamine-formaldehyde prepolymer. To this was added the microcapsules-containing liquid D, and stirred at 60° C. for 10 hours. The resulting mixture was then controlled to have a pH of 7 with a solution of acetic acid added thereto. Thus were produced cyan colors forming microcapsules having a photosensitivity at around 650 nm? The size of the microcapsules fell between 1 and 10 μm.

Provenance & Evidence