Process for preparing a sulfite modified melamine resin solution

Details Process for preparing a sulfite modified melamine resin solution Process for preparing a sulfite modified melamine resin solution

1974-04-17

1976-03-02

Hayes, Lorenzo B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 676R, C08L 6120

Patent

active

039417344

ABSTRACT:
The aqueous melamine resin solutions prepared according to the process of U.S. Pat. No. 2,730,516 by sequential condensation of a sulfite bearing, aqueous solution of melamine and formaldehyde at alkaline and acid pH and subsequent neutralization is stabilized by preliminary condensation of the melamine and formaldehyde prior to addition of the sulfite and by refluxing the ultimate condensation mixture at pH 8.5 for 1 hour or more. Concrete mixtures prepared with the stabilized resin solutions cure more rapidly.

REFERENCES:
patent: 2407599 (1946-09-01), Auten et al.
patent: 2730516 (1956-01-01), Suen et al.
patent: 2863842 (1958-12-01), Bonzagni
patent: 3661829 (1972-05-01), Aignesberger et al.

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