Process of preparing aqueous solutions of melamine-formaldehyde

Details Process of preparing aqueous solutions of melamine-formaldehyde Process of preparing aqueous solutions of melamine-formaldehyde

1974-11-14

1976-10-12

Ziegler, J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 39R, 260 39SB, 260 676R, 260 69R, C08L 6120

Patent

active

039856968

ABSTRACT:
Aqueous solutions of melamine-formaldehyde and melamine-urea-formaldehyde condensation products having anionic sulfo groups in concentrations as high as 50% by weight may be prepared in a three-stage process. In the first stage, melamine or a mixture of melamine with up to 40 mole-% urea, formaldehyde, and an alkali metal sulfite are condensed in aqueous solution at 60.degree.-80.degree.C and pH 10-13 until the solution is free from readily detectable amounts of sulfite. In the second stage, condensation is continued at pH 3.0-4.5 for 30 to 90 minutes. In the third stage, a temperature of 70.degree. to 95.degree.C and a pH of 7.5 to 9.0 are maintained until a sample of the solution, when diluted to 20% solids by weight, has a viscosity of 5 to 40 centipoises at 20.degree.C.

REFERENCES:
patent: 2730516 (1956-01-01), Suen et al.
patent: 3121702 (1964-02-01), Sherr et al.
patent: 3240736 (1966-03-01), Beckwith

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