Absorbent, process for producing the same, and absorbent article comprising the absorbent

Abstract

An absorbent body containing a super absorbent polymer and an absorbent fiber and being thinned by pressurization. The super absorbent polymer has a gel elastic modulus of not less than 2,000 N/m 2 according to a gel elastic modulus test and has an artificial urine absorption amount of not less than 32 cc/g according to an absorption test under pressure at 20 g/cm 2 , and a ratio of the super absorbent polymer to a total weight of the super absorbent polymer and the absorbent fiber is not less than 40 wt %.

1 . An absorbent body containing a super absorbent polymer and an absorbent fiber and being thinned by pressurization, 
 wherein the super absorbent polymer has a gel elastic modulus of not less than 2,000 N/m 2  according to a gel elastic modulus test and has an artificial urine absorption amount of not less than 32 cc/g according to an absorption test under pressure at 20 g/cm 2 , and    a ratio of the super absorbent polymer to a total weight of the super absorbent polymer and the absorbent fiber is not less than 40 wt %.    
     
     
         2 . The absorbent body as claimed in  claim 1 , wherein for the super absorbent polymer, an absorption rate of artificial urine of 30 cc according to an absorption rate test is not more than 60 sec./g.  
     
     
         3 . The absorbent body as claimed in  claim 1  or  2 , wherein for the super absorbent polymer, a value according to a gel permeability rate test is not more than 100 sec. per a permeation amount of 50 cc and not more than 300 sec. per a permeation amount of 100 cc.  
     
     
         4 . The absorbent body as claimed in any one of  claims 1  to  3 , wherein the super absorbent polymer is particles of super absorbent polymer in which a number of particles having a particle diameter of not more than 250 μm is not more than 20% to a number of whole particles.  
     
     
         5 . The absorbent body as claimed in any one of  claims 1  to  4 , wherein the absorbent body is thinned by pressurization so as to allow a density to be not less than 300 kg/m 3 .  
     
     
         6 . The absorbent body as claimed in any one of  claims 1  to  5 , wherein for the absorbent body, a value measured in a stiffness test is not more than 10 mm.  
     
     
         7 . The absorbent body as claimed in any one of  claims 1  to  6 , wherein the absorbent body is an air laid absorbent body obtained by accumulating and forming the absorbent fiber and the super absorbent polymer while disentangling and mixing them according to an air laying method, and performing thinning by pressurization.  
     
     
         8 . A method for manufacturing an absorbent body, wherein an absorbent fiber and a super absorbent polymer are accumulated and formed while they are disentangled and mixed according to an air laying method and thinning by pressurization thereby to obtain the absorbent body, wherein the super absorbent polymer has a gel elastic modulus of not less than 2,000 N/m 2  according to a gel elastic modulus test and an artificial urine absorption amount of not less than 32 cc/g according to an absorption test under pressure at 20 g/cm 2 .  
     
     
         9 . An absorbent article comprising the absorbent body claimed in any one of  claims 1  to  7 .  
     
     
         10 . The absorbent article as claimed in  claim 9 , wherein no elastic member is located inwardly from a portion corresponding to a vicinity of a side edge of the absorbent body.  
     
     
         11 . A disposable diaper in which their both side edge portions at a front side and a back side of an external sheet are bonded thereby forming a waist opening portion and right and left leg opening portions in a use state, comprising the absorbent body claimed in any one of  claims 1  to  7  in a center portion thereof, 
 wherein the disposable diaper is formed so as to allow side ends of a crotch portion of the external sheet to be located within 5 mm from side ends of a crotch portion of the absorbent body.  
 
     
     
         12 . A disposable diaper comprising a fastening tape where a tape substrate is provided with an engagement portion, the fastening tape being mounted on each of both side portions of a back side of a product, and each the engagement portion being mechanically engaged with an external surface of a belly side, 
 wherein a distortion processed portion where distortion in an appearance is furnished by machining is formed on the external surface itself of the belly side to be a target of the engagement portion.    
     
     
         13 . The disposable diaper as claimed in  claim 12 , wherein the external surface of the belly side is formed by a non-woven fabric.  
     
     
         14 . The disposable diaper as claimed in  claim 12  or  13 , wherein a processing for the distortion processed portion of the disposable diaper is selected from embossment processing, crepe processing and bellows processing.  
     
     
         15 . The disposable diaper as claimed in  claim 12  or  13 , wherein the external surface of the belly side is formed by a non-woven fabric having an air permeability, the distortion processed portion is formed to the non-woven fabric, and further, a material which inhibits the air permeability is not provided in at least one portion of the distortion processed portion.  
     
     
         16 . The disposable diaper as claimed in  claim 12  or  13 , wherein the distortion processed portion is formed as separated in a body peripheral direction.