Reaktionsgleichung
C=O.[NH2:3][C:4]([NH2:6])=[O:5].[N:7]1[C:14]([NH2:15])=[N:13][C:11]([NH2:12])=[N:10][C:8]=1[NH2:9].S(=O)=O>C1(C)C(C)=CC=CC=1.O>[CH2:4]=[O:5].[NH2:3][C:4]([NH2:6])=[O:5].[N:7]1[C:14]([NH2:15])=[N:13][C:11]([NH2:12])=[N:10][C:8]=1[NH2:9]Komponenten
Edukt 4
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Reaktionsbedingungen
- Temperatur
- 65 °C
Versuchsvorschrift
A urea-formaldehyde-melamine prepolymer solution is prepared from 165 grams of 37% aqueous formaldehyde, 45 grams of water, 89 grams of urea and 1 gram of melamine, adjusted to pH 9.3 and heated for 1 hour at 65° C. 170 grams of this prepolymer solution are emulsified in a solution of 6 grams of Tetronic 1502 dissolved in 100 grams of xylene, and 0.06 milliequivalents of sulfur dioxide (about 4 normal in xylene solution) is added, resulting in an exothermic reaction. After stirring for 1 hour, the solvent dispersion has little or no precipitate. Without any preliminary phase separation, the product is mixed with water to give about 16% total solids, and this "aqueous redispersion" is steam distilled under high-shear agitation to yield a product free of residual xylene, closely resembling that described in Example 1. A paper coating prepared as described in Example 1 has a scatter coefficient of about 4,000 cm2 /gram.
Aufarbeitung
- customresulting in an exothermic reaction
- customWithout any preliminary phase separation
- additionthe product is mixed with water
Quellen und Nachweise
- ORD-Eintrag
- ord-09fdc8cd40fb42a9b47e86718552c886
- Quelldatensatz
- uspto-grants-1977_11
- Patentnummer
- US04058434
Verknüpfte Notizen
Wird geladen…