Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

Meanwhile, a commercially available powder of melamine is added to 37% water solution of formaldehyde, and this solution is adjusted to pH 9.0 using sodium hydroxide solution and is heated at 60° C. for 30 minutes. Thus, a melamine-formaldehyde prepolymer is obtained. This melamine-formaldehyde prepolymer is added to the above-indicated O/W emulsion and this mixture is heated at 80° C. for 5 hours while being agitated at 100 to 300 rpm by, e.g. an agihomomixer. Subsequently, the mixture is adjusted to pH 7 and is cooled down to room temperature. As a result, an outer wall or shell of melamine-formaldehyde resin is precipitated around each of the liquid drops in the O/W emulsion. Thus, the first invention photosensitive capsules are produced.

Provenance & Evidence