Formaldehyde → Melamine formaldehyde

HRID 1636831Notes

Reaction equation

HRID 1636831 reaction equation
[N:1]1[C:8]([NH2:9])=[N:7][C:5]([NH2:6])=[N:4][C:2]=1[NH2:3].[CH2:10]=[O:11].[OH-].[Na+]>O>[CH2:10]=[O:11].[N:1]1[C:8]([NH2:9])=[N:7][C:5]([NH2:6])=[N:4][C:2]=1[NH2:3]

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 7955MelamineHCID 14798Sodium Hydroxide

Product 1

HCID 93374Melamine formaldehyde

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

Separately from the above, commercially available melamine powder was added to an aqueous 37% formaldehyde solution, and the pH of the mixture obtained was adjusted to 9.0 using a sodium hydroxide solution, followed by heating at a water temperature of 60° C. for 30 minutes to obtain a melamine-formaldehyde prepolymer. The melamine-formaldehyde prepolymer was added to the O/W emulsion previously prepared, and the mixture obtained was heated so as to have a water temperature of 50° C. while stirring at 100 to 300 r.p.m. by means of an agitating homomixer. This state of heating was maintained for 5 hours, and thereafter the pH of the mixture was adjusted to 7, followed by cooling to room temperature. Thus, a cyan (C) capsule slurry in which the above composition was encapsulated therein and whose shells (walls) were formed of melamine-formaldehyde resin were obtained by the in-situ polymerization.

Workup

  1. customthe pH of the mixture obtained

Sources & evidence

ORD record
ord-1b851c68959a4f729ef6f4dda64dbd19
Source dataset
uspto-grants-2000_03
Patent number
US06037093

Reaction notes

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