Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

A styrene-maleic anhydride copolymer heated at 60° C. and a small amount of sodium hydroxide were dissolved in water, whereby there was prepared an aqueous solution of pH 4.0 containing 5% of a styrene-maleic anhydride copolymer and a small amount of sodium hydroxide. In 100 parts of this solution was dispersed 50 parts of Color Index Number "Solvent Blue 105" (Kayaset Blue FR manufactured by NIPPON KAYAKU) and an emulsion was prepared. 20 Parts of melamine, 50 parts of a 37% aqueous formaldehyde solution, 90 parts of water and a small amount of sodium hydroxide were mixed. The mixture was heated to 60° C. In 15 min, the mixture became transparent and a melamine-formalin precondensate was obtained. This precondensate was added to the above prepared emulsion. The mixture was stirred at 60° C. (liquid temperature) for 3 hr, whereby encapsulation was completed.

Provenance & Evidence