Formaldehyde → Formaldehyde

Participants

Reaction Steps

Separately 6 g of melamine, 11 g of an aqueous 37 wt % formaldehyde solution and 83 g of water were heated at 60° C. with stirring, and after 30 minutes a transparent aqueous mixture solution of melamine, formaldehyde and melamine-formaldehyde primary condensation product was obtained. The thus prepared aqueous mixture solution had a pH value of from 6 to 8. This was added to the above described emulsion and blended, and an aqueous 10 wt % phosphoric acid solution was added thereto to adjust the pH value of the resulting liquid to 6.0. The temperature of the liquid was elevated to 65° C. and the liquid was continuously stirred for about 1 hour and thus the encapsulation was completed.

Provenance & Evidence