ACTIVATION OF SWELLING CLAYS AND PROCESSES OF UTILIZATION OF ACTIVATED CLAYS Russian patent published in 2000 - IPC

FIELD: paper-and-pulp industry. SUBSTANCE: dry clay composition contains mixture of alkali-earth bentonite and aqueous solution of activating quantity of alkali-earth or ammonium salt of insulation substance. The latter is selected from phosphonates, hydroxycarboxylic acids, and di- and tricarboxylic acids. Dispersion of activated bentonite is admixed to cellulose suspension. The latter is then dehydrated to give wet sheet, which is further dried. EFFECT: improved working characteristics and stabilized aqueous dispersion of bentonite. 8 cl, 1 tbl, 2 ex