Formaldehyde → Melamine formaldehyde

HRID 463573Notes

Reaction equation

HRID 463573 reaction equation
[OH-].[Na+].C(C1C=CC(O)=CC=1)(C1C=C[C:9]([OH:12])=CC=1)(C)C.[N:20]1[C:27]([NH2:28])=[N:26][C:24]([NH2:25])=[N:23][C:21]=1[NH2:22].C=O>O>[CH2:9]=[O:12].[N:20]1[C:27]([NH2:28])=[N:26][C:24]([NH2:25])=[N:23][C:21]=1[NH2:22]

Participants

6

Reactant 4

HCID 712FormaldehydeHCID 6623Bisphenol AHCID 7955MelamineHCID 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 developer dispersion (previously pulverized and dispersed in a ball mill for 48 hours) obtained by dispersing 45 parts of 4,4'-isopropylidenediphenol in 55 parts of light oil 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-82f650cb2626498a83483524fd979bc5
Source dataset
uspto-grants-1985_05
Patent number
US04520378

Reaction notes

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