| 摘要 |
PROBLEM TO BE SOLVED: To provide a particulate water absorbing agent including a water-absorbable resin which is excellent in physical properties such as a water absorption speed, a non-pressure water absorption capacity, a water absorption capacity under pressure, gel strength, durability, soluble content and a particle size distribution, has excellent deodorizing performance, and emits no bad smell after swelled and which of high concentration is used actually and suitably in absorbers such as a diaper and to provide a method for producing the particulate water absorbing agent.SOLUTION: The water-absorbable resin is obtained by: subjecting a monomer, in which the content of a trace component is controlled, in particular, the content of each of acetic acid and propionic acid is controlled to be 500 ppm or less and that of an acrylic acid dimer is controlled to be 1,000 ppm or less, to reverse phase suspension polymerization to obtain a cross-linked polymer; heating the cross-linked polymer at high temperature of 150-250°C without using an organic solvent substantially to cross-link the surfaces thereof; and granulating the surface-cross-linked polymer without using the organic solvent substantially. |
