HIGH SOLIDS AND LOW VISCOUS AQUEOUS SLURRIES OF CALCIUM CARBONATE-COMPRISING MATERIALS WITH IMPROVED RHEOLOGICAL STABILITY UNDER INCREASED TEMPERATURE Russian patent published in 2017 - IPC D21H17/69 C01F11/18 C08K3/26 C09C1/02 C09C3/10 D21H19/44 D21H21/14 

FIELD: chemistry.

SUBSTANCE: present invention discloses aqueous slurries with improved rheological stability at temperature higher than 65 °C. Said slurries include calcium carbonate containing material and at least one comb-like polymer. Specific viscosity of comb-like polymer, measured at 20 °C and concentration of 45 g/l, differs from specific viscosity measured at 70 °C by 0.15–0.5. Cloud temperature of comb-like polymer, measured in water, is not in range of 20–95 °C. Specific charge of comb-like polymer at pH 8 from -10 C/g to -600 C/g. Viscosity of aqueous slurry at temperature 20–90 °C is 25–1,000 mPa⋅s.

EFFECT: decreased thermal sensitivity of slurry and prevention of increase in viscosity thereof in process of manufacture and use at temperatures exceeding 65 °C.

22 cl, 1 dwg, 7 tbl, 6 ex