| abstract |
FIELD: polymer materials. SUBSTANCE: polymer (superabsorbent) is formed of (i) 55-99.9 wt % of polymerized unsaturated polymerization-capable monomers containing acid groups, from which at least 25% are neutralized; (ii) 0-40 wt % of polymerized unsaturated monomers capable of copolymerizing with (i) monomers; (iii) 0.1-5.0 wt % of cross-linking agent; (iv) 0-30 wt % of water-soluble polymer; amounts of (i)-(iv) being calculated for anhydrous materials. According to invention, 100 parts of above-defined polymer particles with up to 10 parts of at least 10% phosphoric acid and 0.05-0.3 parts of compound, which can react with at least two carboxyl groups and contains no alkali salt-forming group, and/or 0.05-1 parts of compound, , which can react with at least two carboxyl groups and contains one alkali salt-forming group. EFFECT: increased retention capacity, increased gel strength, and increased absorption capacity under pressure with no use of organic solvent. 10 cl, 6 tbl |