Formaldehyde → (Hydroxymethyl)melamine

HRID 482179

Reaction equation

HRID 482179 reaction equation
[CH2:1]=[O:2].[N:3]1[C:10]([NH2:11])=[N:9][C:7]([NH2:8])=[N:6][C:4]=1[NH2:5].[OH-].[Na+]>O>[CH2:1]([NH:5][C:4]1[N:6]=[C:7]([NH2:8])[N:9]=[C:10]([NH2:11])[N:3]=1)[OH:2]

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 7955MelamineHCID 14798Sodium Hydroxide

Product 1

HCID 70300(Hydroxymethyl)melamine

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
70 °C

Procedure

Formaldehyde (50%, 12.0 g, 0.2 mol) was added to a mixture of melamine (12.6 g, 0.1 mol) and water (40 ml) with stirring. The pH of the mixture was adjusted to 9.0-9.2 by addition of NaOH (0.5N). The mixture was heated to 70° C. and a dyestuff (Direct red 252 mg, 2000 ppm based on melamine) was added to give a colored methylolmelaminersolution. In this procedure, other dyestuffs can be used such as direct dyes, fluorescent dyes, dispersion dyes, and mixtures thereof. See Table 1.

Workup

  1. additiona dyestuff (Direct red 252 mg, 2000 ppm based on melamine) was added
  2. customto give a colored methylolmelaminersolution

Sources & evidence

ORD record
ord-8af9f6c403b3492d89625775cedb775e
Source dataset
uspto-grants-1998_08
Patent number
US05795507

Linked notes

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