Process for preparing highly concentrated aqueous solutions of l

Details Process for preparing highly concentrated aqueous solutions of l Process for preparing highly concentrated aqueous solutions of l

1982-02-24

1984-02-07

Pertilla, Theodore E.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

106 90, 524249, 524401, 524428, 524430, 524437, 524598, 524843, 528239, 528254, C08L 6128

Patent

active

044304692

ABSTRACT:
Highly concentrated aqueous solutions of low viscosity of melamine/aldehyde resins are obtained by reacting to a precondensate in a first step melamine and an aldehyde in an alkaline medium and in the presence of water together with at least one compound (I), selected from the group, consisting of an alkali sulfite, an alkaline earth sulfite, an amino sulfonic acid, an amino carboxylic acid, a hydroxycarboxylic acid, a hydroxycarboxylic acid lactone, and a polyhydroxy carboxylic acid lactone, reacting then the thus obtained mixture in a second step with at least one compound (II), selected from the group, consisting of an amino carboxylic acid, a carboxylic acid, a hydroxy carboxylic acid, a hydroxy carboxylic acid lactone, a sulfamic acid, an amino sulfonic acid, a polyhydroxy carboxylic acid and a polyhydroxy carboxylic acid lactone, and then making alkaline the obtained resin solution by adding at least one basic compound (III). The resin solutions prepared according to this invention may be used as added substances for improving the quality of building materials containing inorganic binders.

REFERENCES:
patent: 3985696 (1976-10-01), Aigmesberger et al.

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