METHOD OF PRODUCING AMINO PLASTIC AQUEOUS DISPERSION Russian patent published in 2014 - IPC C08L61/30 C08G12/12 C08G12/38 

FIELD: chemistry.

SUBSTANCE: method of producing an amino plastic aqueous dispersion involves obtaining a dispersion by preparing a concentrated 50-70% urea solution or a mixture of urea and melamine with formaldehyde in molar ratio 1:2.0-2.2; holding the reaction solution while stirring for 50-60 minutes at 50-70°C and pH 7.0-8.0; adding a new portion of urea to final ratio of 1:0.8-1.3; holding for 10-20 minutes; adding 0.01-0.5 wt % stabiliser in form of aqueous solutions of methyl cellulose or derivatives thereof; acidifying to pH 5.0-6.0; mixing at 50-70°C for 10-30 minutes until loss of solubility, cooling and neutralising the system. To obtain dispersions in form of solid particles of a cured polymer, the dispersion system is continuously stirred at 40-50°C and pH 3.0-4.0 for 1-2 hours until a loose powder is obtained.

EFFECT: reduced exothermic effect of the reaction mixture, providing storage stability, capacity for dilution with water and compatibility with solutions of dispersions of other polymers, obtaining aqueous dispersions of amino plastics in form of liquid, gel-like or solid condensation products.

5 cl, 1 tbl