FIELD: optionally materials.
SUBSTANCE: invention relates to technology of preparing mineral fillers, in particular to treating them to impart hydrophobic quality for use in manufacturing of "breathing" films. Mineral filler is treated in first stage with polydialkylsiloxane and then with fatty acid containing more than 24 carbon atoms. Both stages can be conducted simultaneously.
EFFECT: avoided formation of hollows and spots in films.
33 cl, 1 tbl, 10 ex
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