METHOD OF CONTROL OF POLYMER PARTICLES DISTRIBUTION ON SIZES IN PROCEEDING OF WATER POLYMER DISPERSION, WATER POLYMER DISPERSION AND ITS APPLICATION Russian patent published in 2017 - IPC C08F251/00 C08F220/10 C08F212/08 D21H21/16 

FIELD: chemistry.

SUBSTANCE: method of controlling the size distribution of polymer particles formed during the preparation of the aqueous polymer dispersion is described; it comprises: preparing an aqueous solution of a polysaccharide which comprises: (a) 10 to 40 wt % of a polysaccharide containing a free hydroxyl group such as starch, polymerization in a solution of the polysaccharide in the presence of a water-soluble oxidation-reduction system for crosslinking by grafting; (B) from 30 to 60 wt % of at least one optionally substituted styrene, (c) from 60 to 30 wt % of at least one C1-C4 alkyl (meth) acrylate, (d) from 0 to 10 wt % of other ethylenically unsaturated copolymerizable monomers, wherein the sum of (a)+(b)+(c)+(d) is 100%. The polysaccharide is an anionic starch derivative, and the size distribution of the polymer particles obtained is controlled by adjusting the viscosity of the polysaccharide solution before polymerization to a level of <10 mPaSec⋅, with a solid content of 15%, as measured at 23°C using a Brookfield LVDV viscometer with a spindle 18 at 60 rpm. An aqueous polymer dispersion for use in the pulp and paper industry is also described.

EFFECT: preparation of an aqueous polymer dispersion containing small particles, with a narrow size distribution.

15 cl, 1 tbl, 7 ex