Production processes for basic water-absorbent resin and water-absorbing agent, and use thereof

Abstract

The present invention provides: a production process for a basic water-absorbent resin to be a main component of a water-absorbing agent which exhibits an excellent water absorption capacity under a load with high productivity; a production process for a water-absorbing agent; and use thereof. The production process for an irregular shape basic water-absorbent resin comprises the step of reacting a basic resin and a crosslinking agent in order to obtain the basic water-absorbent resin, with the process forwarding a crosslinking reaction and pulverizing the resultant product at the same time. The first production process for a water-absorbing agent comprises the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the above-mentioned process. The second production process for a water-absorbing agent comprises the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the above-mentioned process.

What is claimed is:  
     
         1 . A production process for an irregular shape basic water-absorbent resin, comprising the step of reacting a basic resin and a crosslinking agent in order to obtain the basic water-absorbent resin, with the process forwarding a crosslinking reaction and pulverizing the resultant product at the same time.  
     
     
         2 . A production process for a basic water-absorbent resin according to    claim 1   , further comprising the step of exhausting the entirety of the pulverized product from a reaction vessel after forwarding the crosslinking reaction and the pulverization in the reaction vessel.  
     
     
         3 . A production process for a basic water-absorbent resin according to    claim 1   , further comprising the steps of supplying the basic resin and the crosslinking agent into a reaction vessel, and exhausting the pulverized product from the reaction vessel, with carrying out the crosslinking reaction and the pulverization in the reaction vessel.  
     
     
         4 . A production process for a basic water-absorbent resin according to    claim 1   , wherein at least 80 weight % of the pulverized product particles have a particle size of 10 to 1000 μm.  
     
     
         5 . A production process for a basic water-absorbent resin according to    claim 2   , where in at least 80 weight % of the pulverized product particles have a particle size of 10 to 1000 μm.  
     
     
         6 . A production process for a basic water-absorbent resin according to    claim 3   , wherein at least 80 weight % of the pulverized product particles have a particle size of 10 to 1000 μm.  
     
     
         7 . A production process for a water-absorbing agent, comprising the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the process as recited in    claim 1   .  
     
     
         8 . A production process for a water-absorbing agent, comprising the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the process as recited in    claim 2   .  
     
     
         9 . A production process for a water-absorbing agent, comprising the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the process as recited in    claim 3   .  
     
     
         10 . A production process for a water-absorbing agent, comprising the step of blending an acidic water-absorbent resin with the basic water-absorbent resin obtained by the process as recited in    claim 4   .  
     
     
         11 . A production process for a water-absorbing agent, comprising the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the process as recited in    claim 1   .  
     
     
         12 . A production process for a water-absorbing agent, comprising the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the process as recited in    claim 2   .  
     
     
         13 . A production process for a water-absorbing agent, comprising the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the process as recited in    claim 3   .  
     
     
         14 . A production process for a water-absorbing agent, comprising the step of obtaining a mixture of an acidic water-absorbent resin and the basic water-absorbent resin by coexisting with the acidic water-absorbent resin when carrying out the crosslinking reaction and the pulverization in the process as recited in    claim 4   .  
     
     
         15 . A production process for a basic water-absorbent resin according to    claim 11   , wherein the basic resin is crosslinked in a concentration of not less than 50 weight %.  
     
     
         16 . A production process for a water-absorbing agent according to    claim 7   , wherein the acidic water-absorbent resin has a water content of less than 20 weight %.  
     
     
         17 . A production process for a water-absorbing agent according to    claim 11   , wherein the acidic water-absorbent resin has a water content of less than 20 weight %.  
     
     
         18 . A production process for a water-absorbing agent according to    claim 15   , wherein the acidic water-absorbent resin has a water content of less than 20 weight %.  
     
     
         19 . An absorbent product, such as a diaper, a sanitary napkin, an incontinent article, and an odor control article, comprising a water-absorbing agent as a constituent material, wherein the water-absorbing agent is obtained by the process as recited in    claim 7   .  
     
     
         20 . An absorbent product, such as a diaper, a sanitary napkin, an incontinent article, and an odor control article, comprising a water-absorbing agent as a constituent material, wherein the water-absorbing agent is obtained by the process as recited in    claim 11   .