초록 ▼

The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement

The invention provides: a water-absorbent resin granule-containing composition with resolution of various problems, as caused by water-absorbent resin fine powders, and with high granulation strength, and with no physical property deterioration due to granulation, and, if anything, with improvement of the absorption capacity under a load by granulation; and a process for producing the above granule. A water-absorbent resin primary particle and a water-absorbent resin granule are separately surface-crosslinked and then mixed, or mixed and then surface-crosslinked. The granulation is carried out by mixing a preheated aqueous liquid and a water-absorbent resin powder at a high speed or by supplying a water-absorbent resin powder downstream of an aqueous liquid with a continuous extrusion mixer.

대표청구항 ▼

What is claimed is: 1. A water-absorbent resin composition, which comprises a product obtained by surface-crosslinking a mixture of a water-absorbent resin primary particle and a water-absorbent resin granule. 2. A water-absorbent resin composition according to claim 1, wherein the water-absorben

What is claimed is: 1. A water-absorbent resin composition, which comprises a product obtained by surface-crosslinking a mixture of a water-absorbent resin primary particle and a water-absorbent resin granule. 2. A water-absorbent resin composition according to claim 1, wherein the water-absorbent resin granule is a granule as obtained by mixing 100 parts by weight of a water-absorbent resin powder with 80 to 280 parts by weight of an aqueous liquid. 3. A water-absorbent resin composition according to claim 1, wherein the ratio by weight of the water-absorbent resin primary particle to the water-absorbent resin granule is in the range of 95/5 to 40/60. 4. A water-absorbent resin composition, which comprises a mixture of a surface-crosslinked product of a water-absorbent resin primary particle and a surface-crosslinked product of a water-absorbent resin granule. 5. A water-absorbent resin composition according to claim 4, wherein the water-absorbent resin granule is a granule as obtained by mixing 100 parts by weight of a water-absorbent resin powder with 80 to 280 parts by weight of an aqueous liquid. 6. A water-absorbent resin composition according to claim 4, wherein the ratio by weight of the water-absorbent resin primary particle to the water-absorbent resin granule is in the range of 95/5 to 40/60. 7. A water-absorbent resin composition, which comprises a mixture of a water-absorbent resin primary particle and a water-absorbent resin granule and has an absorption capacity of at least 25 g/g for a physiological salt solution under a load of 50 g/cm2. 8. A water-absorbent resin composition according to claim 7, wherein the water-absorbent resin granule is a granule as obtained by mixing 100 parts by weight of a water-absorbent resin powder with 80 to 280 parts by weight off an aqueous liquid. 9. A water-absorbent resin composition according to claim 7, wherein the ratio by weight of the water-absorbent resin primary particle to the water-absorbent resin granule is in the range of 95/5 to 40/60. 10. A process for producing a water-absorbent resin composition, comprising the step of adding a crosslinking agent to a mixture of a water-absorbent resin primary particle and a water-absorbent resin granule, thus crosslinking the surface neighborhood of the mixture. 11. A process according to claim 10 wherein an average particle diameter of the water-absorbent resin primary particle and/or an average particle diameter of the water-absorbent resin granule is in a range of 200 to 600 μm, which is determined by a classification using JIS standard sieves. 12. A process for producing a water-absorbent resin composition, comprising the step of mixing a surface-crosslinked product of a water-absorbent resin primary particle and a surface-crosslinked product of a water-absorbent resin granule. 13. A process according to claim 12, wherein an average particle diameter of the water-absorbent resin primary particle and/or an average particle diameter of the water-absorbent resin granule is in a range of 200 to 600 μm, which is determined by a classification using JIS standard sieves. 14. A water-absorbent resin composition according to claim 7, wherein a proportion of particles having a particle size of 850 to 150 μm is 95% by weight or higher, which is determined by a classification using JIS standard sieves. 15. A water-absorbent resin composition according to claim 7, wherein the water-absorbent resin composition has an absorption speed of 100 seconds or less, which is defined as a number of seconds of a time for 0.358 g of the water-absorbent resin composition to absorb all of an artificial urine of 10.00 g. 16. A water-absorbent resin composition according to claim 14, wherein the water-absorbent resin composition has a granulation fracture ratio of 10% or less, which is defined as a ratio of particles having a particle diameter of less than 150 μm, which is determined by a classification using JIS standard sieves, after a fracture by applying an impact force. 17. A water-absorbent resin composition according to claim 7, wherein the water-absorbent resin composition has a water-soluble content of 15% by weight or lower. 18. A water-absorbent resin composition according to claim 1, wherein a proportion of particles having a particle size of 850 to 150 μm is 95% by weight or higher, which is determined by a classification using JIS standard sieves. 19. A water-absorbent resin composition according to claim 4, wherein a proportion of particles having a particle size of 850 to 150 μm is 95% by weight or higher, which is determined by a classification using JIS standard sieves. 20. A process according to claim 10, wherein, in the water-absorbent resin composition, a proportion of particles having a particle size of 850 to 150 μm is 95% by weight or higher, which is determined by a classification using JIS standard sieves. 21. A process according to claim 12, wherein, in the water-absorbent resin composition, a proportion of particles having a particle size of 850 to 150 μm is 95% by weight or higher, which is determined by a classification using JIS standard sieves.