Preparations of storage-stable aqueous solutions of melamine-for

Details Preparations of storage-stable aqueous solutions of melamine-for Preparations of storage-stable aqueous solutions of melamine-for

1982-04-05

1984-06-12

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524767, C08K 521

Patent

active

044542771

ABSTRACT:
An improved process for substantially increasing the shelf-life of aqueous solutions of melamine-formaldehyde resins wherein the molar ratio of melamine to formaldehyde is from 1:1.7 to 1:3.5 by the addition of a stabilizing amount of urea after condensation, which process includes the steps of adjusting pH of the resin solution before and after the dissolution of the urea within certain narrow but easily controllable pH ranges. The properties of the resin solution can be further improved and the stabilizing effect of the addition of urea increased by adding a monohydric C.sub.1 -C.sub.4 alkanol during condensation of the resin.

REFERENCES:
patent: 2640041 (1953-05-01), Bruner et al.
patent: 2697086 (1954-12-01), Lindenfelser et al.
patent: 2839484 (1958-06-01), Renner
patent: 3159593 (1964-12-01), Morini et al.

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