Formaldehyde → Melamine formaldehyde

HRID 380266Notes

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+]>>[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

Reactant 3

HCID 712Formaldehyde

HCID 7955Melamine

HCID 14798Sodium Hydroxide

Product 1

HCID 93374Melamine formaldehyde

Conditions

Temperature: 60 °C

Procedure

Apart from the above, melamine powder was added to an aqueous solution of 37% formaldehyde. This was controlled to have a pH of 9 with an aqueous solution of sodium hydroxide added thereto, and then heated at 60° C. for 30 minutes to obtain a melamine-formaldehyde prepolymer. To this was added the microcapsules-containing liquid I, and stirred at 60° C. for 10 hours. The resulting mixture was then controlled to have a pH of 7 with acetic acid added thereto. Thus were produced cyan colors forming microcapsules 1 having a photosensitivity at around 650 nm? The size of the microcapsules fell between 1 and 3 μm.

Workup

additionadded

Sources & evidence

ORD record: ord-a1da74a8c4444a688f43f9f14f49fe62
Source dataset: uspto-grants-2001_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06303259B1

Reaction notes

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