Formaldehyde → Melamine formaldehyde
Reaction equation
[N:1]1[C:8]([NH2:9])=[N:7][C:5]([NH2:6])=[N:4][C:2]=1[NH2:3].[CH2:10]=[O:11]>O>[CH2:10]=[O:11].[N:1]1[C:8]([NH2:9])=[N:7][C:5]([NH2:6])=[N:4][C:2]=1[NH2:3]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 60 °C
Procedure
Independently, to 13.2 g of melamine were added 21.6 g of 37% aqueous solution of formaldehyde and 70 g of distilled water, and the resulting mixture was stirred at 60° C. for 30 minutes to obtain a transparent melamine-formaldehyde precondensate. To 40 g of the precondensate was added the above-prepared W/O/W emulsion, and the resulting mixture was adjusted to pH 6.0 using 20% aqueous solution of phosphoric acid under stirring. The mixture was then heated to 60° C. and stirred for 120 minutes. Further, to the mixture was added 16 g of a 40% aqueous solution of urea to remove formaldehyde remaining in the microcapsule dispersion, and the mixture was adjusted to pH 3.5 using 20% aqueous solution of phosphoric acid. After the reaction was completed, the mixture was adjusted to pH 6.5 using 10% aqueous solution of sodium hydroxide, and then cooled. Thus, a light-sensitive microcapsule dispersion (A) containing microcapsules having a melamine-formaldehyde resin shell was obtained.
Sources & evidence
- ORD record
- ord-4e052e8877be4902b6397997c2ce8b53
- Source dataset
- uspto-grants-1992_06
- Patent number
- US05118590
Reaction notes
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