Formaldehyde → Melamine formaldehyde

HRID 224539

Reaktionsgleichung

C(C1C=CC2C(=CC=CC=2)C=1C(C)C)(C)C.C(C1=C[C:27](OC1=O)=[O:28])=CC1C=CC=CC=1.[OH-].[Na+].[N:34]1[C:41]([NH2:42])=[N:40][C:38]([NH2:39])=[N:37][C:35]=1[NH2:36].C=O>O>[CH2:27]=[O:28].[N:34]1[C:41]([NH2:42])=[N:40][C:38]([NH2:39])=[N:37][C:35]=1[NH2:36]

Komponenten

Reaktionsbedingungen

Temperatur: 60 °C

Versuchsvorschrift

A hydrophobic material was prepared by dissolving under heating 2 gr of crystal violet lactone (CVL) and 1 gr of benzoyl leucomethylene blue (BLMB) in 100 gr of KMC-113 (commercial name for an oil product--an aromatic hydrocarbon solvent mainly composed of diisopropylnaphthalene, b.p. 250°-350° C. - by Kureha Chemicals), and this hydrophobic material (an oil solution of dye) was emulsified in 100 gr of a 5% aqueous solution (pH 4.0) of Scripset 520 (a styrene-maleic anhydride (1:1 by mole) copolymer by Monsanto) having dissolved therein a small quantity of sodium hydroxide. Then, a mixture composed of 10 gr of melamine, 25 gr of 37% formaldehyde and 65 gr of water was rendered into pH 9 with sodium hydroxide and heated to 60° C., whereby the solution became transparent in 15 minutes and a melamine-formaldehyde precondensate was obtained. To this precondensate was added the said emulsion, and after adjusting the solution temperature to 60° C., the mixture was agitated. Formation of the capsules was confirmed in 30 minutes, so that products were cooled down to room temperature. The thus obtained micro-capsules could be excellently applied to no-carbon copying paper. (See the photograph of FIGURE).

Aufarbeitung

customA hydrophobic material was prepared
dissolutionby dissolving
dissolutionhaving dissolved

Quellen und Nachweise

ORD-Eintrag: ord-d1f3dc1a81604491982ead01ce14c7ad
Quelldatensatz: uspto-grants-1980_11
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US04233178

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