Formaldehyde → Melamine formaldehyde

Participants

Reaction Steps

Separately, 7 parts of melamine and 18 parts of 37% formalin were added to 30 parts of water. The mixture was adjusted to pH 9.0 with sodium hydroxide and heated for 15 min to obtain a melamine-formaldehyde precondensate. This precondensate was added to the above prepared emulsion. The mixture was kept at 60° C. for 2 hr and then at 85° C. for 1 hr, whereby color former microcapsules No. (1)-1 to (1)-4 were formed. Respective microcapsules had average particle diameters as shown in Table 1.

Provenance & Evidence