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].[OH-].[Na+]>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 3
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 60 °C
Procedure
Meanwhile, a commercially available powder of melamine is added to 37% water solution of formaldehyde, and this solution is adjusted to pH 9.0 using sodium hydroxide solution and is heated at 60° C. for 30 minutes. Thus, a melamine-formaldehyde prepolymer is obtained. This melamine-formaldehyde prepolymer is added to the above-indicated O/W emulsion and this mixture is heated at 80° C. for 5 hours while being agitated at 100 to 300 rpm by, e.g. an agihomomixer. Subsequently, the mixture is adjusted to pH 7 and is cooled down to room temperature. As a result, an outer wall or shell of melamine-formaldehyde resin is precipitated around each of the liquid drops in the O/W emulsion. Thus, the first invention photosensitive capsules are produced.
Sources & evidence
- ORD record
- ord-dec010224f3c4fe0b816c509fe804ac0
- Source dataset
- uspto-grants-1997_11
- Patent number
- US05686220
Reaction notes
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