FIELD: pulp industry.
SUBSTANCE: invention relates to a composition and a method of imparting resistance to penetration of aqueous liquids to paper and cardboard. Composition for treating surface of a paper product includes a water-soluble hydroxylated polymer and an alkaline solution or dispersion of non-sulphated lignin or lignin, soluble only in alkaline medium. Hydroxylated polymer is non-cationogenic starch. Composition has pH from 7 to 9.
EFFECT: improved resistance of the paper product to penetration of aqueous liquids.
12 cl, 9 tbl, 10 ex
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