Formaldehyde → Melamine formaldehyde
Reaction equation
[OH-:1].[Na+].[N:3]1[C:10]([NH2:11])=[N:9][C:7]([NH2:8])=[N:6][C:4]=1[NH2:5].[CH2:12]=O>O>[N:3]1[C:10]([NH2:11])=[N:9][C:7]([NH2:8])=[N:6][C:4]=1[NH2:5].[CH2:12]=[O:1]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 60 °C
Procedure
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 "Disperse Yellow 54" (brand name: Kayaset Yellow A.G, manufactured by NIPPON KAYAKU) and an emulsion was prepared. 3 Parts of melamine, 7.5 parts of a 37% aqueous formaldehyde solution, 40 parts of water and a slight 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.
Workup
- customwhereby there was prepared an aqueous solution of pH 4.0
- additionIn 100 parts of this solution was dispersed 50 parts of Color Index Number "
- additionDisperse Yellow 54" (brand name: Kayaset Yellow A.G, manufactured by NIPPON KAYAKU)
- customan emulsion was prepared
Sources & evidence
- ORD record
- ord-7176a9ddce81406f980954d2a68fdd56
- Source dataset
- uspto-grants-1986_04
- Patent number
- US04579770
Reaction notes
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