Formaldehyde → Melamine formaldehyde
Reaction equation
CN(C)C1C=CC([C:9]2(C3C=CC(N(C)C)=CC=3)C3C(=CC(N(C)C)=CC=3)C(=O)[O:10]2)=CC=1.C(/C(/C(O)=O)=C/C(O)=O)=CC1C=CC=CC=1.[OH-].[Na+].[N:50]1[C:57]([NH2:58])=[N:56][C:54]([NH2:55])=[N:53][C:51]=1[NH2:52].C=O>C1(C(C2C=CC=CC=2)C)C=CC=CC=1.O>[CH2:9]=[O:10].[N:50]1[C:57]([NH2:58])=[N:56][C:54]([NH2:55])=[N:53][C:51]=1[NH2:52]Participants
Conditions
- Temperature
- 60 °C
Procedure
80 Parts of a solution of 4.8 parts of 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide (CVL) in 1,1-diphenylethane was emulsified into 100 parts of 5% aqueous solution of styrene-maleic acid copolymer containing a small quantity of sodium hydroxide and having a pH value of 4.0. On the other hand, 10 parts of melamine, 25 parts of 37% aqueous solution of formaldehyde and 65 parts of water were mixed together. The mixture was adjusted to pH 9 with sodium hydroxide and heated to 60° C., whereby the mixture became transparent in 15 minutes to give a melamine-formaldehyde precondensate. It was added to the above-mentioned emulsion and stirring was continued at a liquid temperature of 60° C. In 30 minutes, formation of capsule was observed, so that the mixture was cooled to room temperature. The microcapsule dispersion thus obtained had a solid content of about 45%.
Sources & evidence
- ORD record
- ord-8034509deeca42beb4d75a241df151e4
- Source dataset
- uspto-grants-1984_12
- Patent number
- US04486764
Reaction notes
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