FIELD: chemistry.
SUBSTANCE: dispersion contains 55-70 wt % fine particles of polytetrafluoroethylene (PTFE) having average diametre of 0.1-0.5 mcm and 0.0001-0.02 wt % (in terms of PTFE weight) special salt of fluorine-containing C8 carboxylic acid (APFO) such as ammonium perfluorooctanoate, 1-20 wt % (in terms of PTFE weight) special nonionic surfactant and 0.01-0.3 wt % (in terms of PTFE weight) special salt of fluorine-containing C5-7 carboxylic acid such as ammonium perfluorohexanoate.
EFFECT: properties of the dispersion enable to obtain crack resistant coatings which are not subject to colouration during hot drying and do not form problematic ionic impurities, as a result of improved functional stability of aqueous dispersions of PTFE even for concentrations of APFO without increasing viscosity.
8 cl, 10 ex, 3 tbl
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