WATER-ABSORBING POLYMER PARTICLES Russian patent published in 2015 - IPC C08F2/10 C08F20/04 C08F220/06 A61L15/22 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining water-absorbing polymer particles by polymerisation of monomer solution drips. Monomer solution contains at least one ethylene-unsaturated monomer, which has acid groups and can be at least partly neutralised; at least one cross-linking agent; at least one initiator and water. Polymerisation includes passing concurrent gas flow through polymerisation chamber. Temperature of gas, leaving polymerisation chamber, constitutes 130°C or lower. Temperature of gas inside polymerisation chamber constitutes at least 0.5 m/s. Drips are created by means of drip-forming plate. Distance between plate holes constitutes from 10 to 50 mm. Also described are water-absorbing, agglomerated polymer particles, liquid-absorbing products.

EFFECT: obtaining water-absorbing polymer particles with higher bulk density, narrow distribution of values of particle diameter, several smaller planes instead one big plane, excellent mechanical stability, as well as excellent dosing properties.

17 cl, 10 dwg, 21 tbl, 25 ex