Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

To 385 g of a distilled water were added 71.3 g of melamine and 118 g of formalin, and the resulting mixture was heated at 60° C. for 30 minutes under stirring to obtain a melamine-formalin precondensate. 77.1 g of the melamine-formalin precondensate was added to the above-obtained dispersion (Dispersion I), and the resulting mixture was again adjusted to pH 6.0 using a 20 % aqueous solution of phosphoric acid. The mixture was then heated at 60° C. for 90 minutes under stirring, to prepare a dispersion of microcapsules (Microcapsule-dispersion J), each microcapsule having a melamine-formaldehyde resin wall.

Provenance & Evidence