Formaldehyde → Melamine formaldehyde

Participants

Reaction Steps

Fifteen (15) parts of a partial sodium salt of an acrylic acid/itaconic acid copolymer was dissolved in 135 parts of deionized water to obtain a 10-% aqueous solution. Thirty (30) parts of this 10-% aqueous solution containing the acrylic acid/itaconic acid copolymer was mixed with 60 parts of the 10-% aqueous solution of the sulfonic acid-modified polyvinyl alcohol used in Example 2, and then the mixture was adjusted to a pH of 4.8 by addition of a 20-% aqueous caustic soda. This mixture was further mixed with 180 parts of the oil included dyes used in Example 1 to form a uniform emulsion having an average particle size of 4.3μ. Separately, a melamine/formaldehyde precondensate was prepared by mixing 10 parts of melamine with 20 parts of 37-% formalin and adjusting the product to a pH of 8.5 by addition of caustic soda.

Provenance & Evidence