GRAFTED POLYMERIC ADDITIVE FOR PIGMENT DISPERSION AND PAINT EMPLOYING SAME WITH IMPROVED HIDING Russian patent published in 2017 - IPC C09D151/00 C09B67/08 C08F265/02 C08F257/02 C09D7/12 

FIELD: chemistry.

SUBSTANCE: present invention relates to a grafted pigment dispersing polymeric additive for opacifying pigments. Claimed a grafted pigment dispersing polymeric additive comprising a polymeric pigment dispersant grafted onto a polymeric carrier, wherein the polymeric pigment dispersant has a molecular weight of about 1000 to about 20000 dalton and an acid number from about 150 to about 250, and wherein the polymeric pigment dispersant is soluble in an alkali solution, andwherein the minimum film forming temperature (MFFT) of the polymeric carrier is greater than about 10°C and less than about 130°C, and wherein the grafted pigment dispersing polymeric additive is capable of adsorbing to an opacifying pigment. The grafted pigment dispersing polymeric additive particle size is in the range of 75 nm to about 200 nm in diameter. Claimed a paint composition comprising at least a latex binder, the grafted pigment dispersing polymeric additive and an opacifying pigment.

EFFECT: grafted additive exhibits improved paint hiding and tint strength.

21 cl, 4 dwg, 4 tbl, 32 ex