Low-salt containing aqueous solutions of melamine-formaldehyde r

Details Low-salt containing aqueous solutions of melamine-formaldehyde r Low-salt containing aqueous solutions of melamine-formaldehyde r

1983-02-15

1984-04-24

Pertilla, Theodore E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

106 90, 106 97, 524598, 528254, C08L 6132

Patent

active

044449453

ABSTRACT:
Low-salt containing aqueous solutions of melamine formaldehyde condensation products having anionic sulfo groups are prepared in a two stage process. In the first stage melamine, formaldehyde, and bisulfite are condensed in an aqueous solution at atmospheric reflux and pH 8-10 for 1-5 hours. In the second stage, condensation is continued at pH 6-7 and atmospheric reflux for 2-6 hours. The product is cooled and adjusted to pH 7-9.

REFERENCES:
patent: 3941734 (1976-03-01), Aignesberger et al.
patent: 3985696 (1976-10-01), Aignesberger et al.

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