Formaldehyde → Melamine formaldehyde

HRID 648137Notes

Reaction equation

C(C1=C[C:11](OC1=O)=[O:12])=CC1C=CC=CC=1.[Na].[N:17]1[C:24]([NH2:25])=[N:23][C:21]([NH2:22])=[N:20][C:18]=1[NH2:19].C=O.[OH-].[Na+]>C1(C(C2C=CC=CC=2)C)C=CC=CC=1.O>[CH2:11]=[O:12].[N:17]1[C:24]([NH2:25])=[N:23][C:21]([NH2:22])=[N:20][C:18]=1[NH2:19]

Participants

Conditions

Temperature: 60 °C

Procedure

Thus, 80 parts of a solution of 3.5 parts of crystal violet lactone (CVL) and 1.5 parts of benzoyl leucomethylene blue (BLMB) in 1,1-diphenylethane was added to 100 parts of 5% aqueous solution of styrenemaleic anhydride copolymer containing a small quantity of sodium hdyroxide and having a pH value of 4.0, and emulsified to give an emulsion. On the other hand, a mixture comprising 10 parts of melamine, 25 parts of 37% aqueous solution of formaldehyde and 65 parts of water was adjusted to pH 9.0 with sodium hydroxide and heated to 60° C. The mixture became transparent in 15 minutes, and there was obtained a melamine-formaldehyde pre-condensate. The pre-condensate was added to the above-mentioned emulsion, the temperature was adjusted to 60° C. and stirring was continued. The formation of capsules was confirmed in 30 minutes, after which the mixture was cooled to room temperature. The microcapsule-containing dispersion thus obtained had a solid content of about 45%.

Workup

customto give an emulsion

Sources & evidence

ORD record: ord-87668fcf8f974f96ba029920bbab9f2d
Source dataset: uspto-grants-1983_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04411451

Reaction notes

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