METHOD FOR CONTROLLING DISTRIBUTION BY SIZES OF POLYMER PARTICLES DURING PRODUCTION OF AQUEOUS POLYMERIC DISPERSION, WATER POLYMERIC DISPERSION AND ITS APPLICATION

摘要

1. A method of controlling the size distribution formed during the preparation of an aqueous polymer dispersion of polymer particles, comprising: obtaining an aqueous polysaccharide solution that contains- (a) from 10 to 40% (mass) of a polysaccharide containing a free hydroxyl group, such as starch, - polymerization in a polysaccharide solution in the presence of a water-soluble redox system for crosslinking by grafting; - (b) from 30 to 60% (mass) of at least one optionally substituted styrene, - (c) from 60 to 30% ( mass.) in at least one C1-C4 alkyl (meth) acrylate, - (d) from 0 to 10% (mass) of other ethylenically unsaturated copolymerizable monomers, where the sum of (q) + (b) + (c) + (d) is 100 %, characterized in that they control the size distribution of the obtained polymer particles by adjusting the viscosity of the polysaccharide solution before polymerization, bringing it to a level of 20 MPa · s, as measured at 23 ° C using a Brookfield LVDV viscometer with spindle 18 at 60 rpm. 2. The method according to claim 1, characterized in that the viscosity of the polysaccharide solution is adjusted before polymerization by adjusting it to a level of 15 mPa · s, preferably 10 mPa · s, as measured at 23 ° C using a Brookfield LVDV viscometer with spindle 18 at 60 rpm. min. 3. The method according to claim 2, characterized in that the viscosity of the polysaccharide solution is adjusted before polymerization by adjusting it to a value in the range of 5-20 mPa · s, preferably 5-15 mPa · s, more preferably 6-10 mPa · s, as measured at 23ºC using a Brookfield LVDV viscometer with spindle 18 at 60 rpm. 4. The method according to PP. 1, 2 or 3, characterized in that they regulate the viscosity of the polysaccharide solution before polymerization by selecting at least one of the following solution parameters