Formaldehyde → Melamine formaldehyde

Participants

Reaction Conditions

Reaction Steps

A photosetting microcapsule dispersion was prepared in the following way. A mixture consisting of 80 parts of an epoxy acrylate photosetting resin (trade name "Ripoxy" available from Showa Kobunshi Co., Ltd.) and 0.2 part of benzoinethyl ether was emulsified in 100 parts of a 5% aqueous solution (pH 4.0) of a styrenemaleic anhydride copolymer and a small quantity of sodium hydroxide. On the other hand, a mixture composed of 10 parts of melamine, 25 parts of a 37% formaldehyde solution and 65 parts of water was adjusted to pH 9 with sodium hydroxide and heated to 60° C., whereby the mixture became transparent in 15 minutes to obtain a melamine-formaldehyde precondensate. This precondensate was added to the previously prepared emulsion and the mixture was stirred at 60° C. for 4 hours and then cooled to room temperature.

Provenance & Evidence