Formaldehyde → Melamine formaldehyde

HRID 463572Notes

Reaction equation

HRID 463572 reaction equation
[OH-:1].[Na+].C1CCCCC1.[N:9]1[C:16]([NH2:17])=[N:15][C:13]([NH2:14])=[N:12][C:10]=1[NH2:11].[CH2:18]=O>O>[CH2:18]=[O:1].[N:9]1[C:16]([NH2:17])=[N:15][C:13]([NH2:14])=[N:12][C:10]=1[NH2:11]

Participants

6

Reactant 4

HCID 712FormaldehydeHCID 7955MelamineHCID 8078CyclohexaneHCID 14798Sodium Hydroxide2×

Product 1

HCID 93374Melamine formaldehyde

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

In 100 parts of a 5% aqueous solution (pH 4.0) of a small quantity of sodium hydroxide together with styrene-maleic anhydride copolymer heated at 60° C. were dispersion-emulsified 80 parts of a color former dispersion (previously pulverized and dispersed in a ball mill for 48 hours) obtained by dispersing 30 parts of 3-diethylamino-6-methyl-7-anilinofluorane in 70 parts of cyclohexane to prepare an emulsion having an emulsion particle size of about 4 to 5 μm. Separately, a mixture of 10 parts of melamine, 25 parts of a 37% formaldehyde aqueous solution, 65 parts of water and a small quantity of sodium hydroxide was heated to 60° C. The mixture became transparent 15 minutes after to obtain the melamine-formaldehyde precondensate. This precondensate was added to the emulsion. Stirring was continued at a liquid temperature of 60° C. for 3 hours to complete microencapsulation.

Workup

  1. additiondispersed in a ball mill for 48 hours)
  2. customobtained
  3. customto prepare an emulsion

Sources & evidence

ORD record
ord-d1eb94f524a942e18c30ea03d0e0e124
Source dataset
uspto-grants-1985_05
Patent number
US04520378

Reaction notes

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