Absorbent core with high superabsorbent material content

Abstract

An absorbent core includes a core wrap enclosing an absorbent material, and one or more channels extending at least in the crotch region. The core wrap is at least partially sealed.

What is claimed is: 
     
         1 . An absorbent core, wherein the absorbent core comprises
 a core wrap enclosing an absorbent material;   a front edge, a back edge, two longitudinal edges, a front region, a back region and a crotch region, the absorbent core having a longitudinal axis oriented in a longitudinal direction, and a length (L) as measured between the front edge and back edge along the longitudinal axis which is at least 320 mm;   a channel that is substantially free of the absorbent material, that extends from the crotch region into the back region, and that is not coincident with the longitudinal axis;   wherein the absorbent core has a Wet Compression Force of about 5.0 N or less; and   wherein the core wrap is at least partially sealed along the edges of the core.   
     
     
         2 . The absorbent core of  claim 1 , wherein the channel has a length that is at least 10% of the length L of the absorbent core. 
     
     
         3 . The absorbent core according  claim 1 , wherein the channel comprises a width of at least about 2 mm. 
     
     
         4 . The absorbent core of  claim 1 , wherein the absorbent material comprises less than about 10% of natural or synthetic fibers by total weight of the absorbent material. 
     
     
         5 . The absorbent core of  claim 1 , wherein the first substrate comprises a first nonwoven and the second substrate comprises a second nonwoven, and wherein the first nonwoven forms a C-wrap around the second nonwoven. 
     
     
         6 . The absorbent core of  claim 1 , wherein the absorbent material defines an absorbent material deposition area within the core wrap, wherein the absorbent material deposition area is rectangular or shaped with a width having a minimum in the crotch region. 
     
     
         7 . The absorbent core of  claim 6 , wherein the basis weight of the superabsorbent polymers is not homogenously distributed along the longitudinal axis of the core, and wherein the basis weight of the superabsorbent polymers is at least 10% percent higher at the crotch point of the core than at another point of the absorbent material deposition area on the longitudinal axis. 
     
     
         8 . The absorbent core of  claim 1  wherein the absorbent material is at least partially immobilized on the core wrap. 
     
     
         9 . The absorbent core of  claim 1  comprising a first absorbent layer and a second absorbent layer, wherein the first absorbent layer comprises a first substrate and a first layer of superabsorbent polymers, wherein the second absorbent layer comprises a second substrate and a second layer of superabsorbent polymers. 
     
     
         10 . The absorbent core of  claim 1  wherein the Wet Compression Force from about 1.00 N to about 3.00 N. 
     
     
         11 . The absorbent core of  claim 1 , comprising from about 5 g to about 60 g of superabsorbent polymers. 
     
     
         12 . The absorbent core of  claim 1 , wherein the caliper of the core, as measured at the crotch point, is from about 0.25 mm to about 5.0 mm. 
     
     
         13 . An absorbent article comprising: a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core positioned between the topsheet and the backsheet; wherein the absorbent core comprises the absorbent core of  claim 1 . 
     
     
         14 . An absorbent core, wherein the absorbent core comprises a core wrap enclosing an absorbent material;
 the absorbent core comprising a front edge, a back edge, two longitudinal edges, a front region, a back region and a crotch region, the absorbent core having a longitudinal axis oriented in a longitudinal direction, and a length (L) as measured between the front edge and back edge along the longitudinal axis which is at least 320 mm;   a channel that is substantially free of the absorbent material, that extends from the crotch region into the back region, and that is not coincident with the longitudinal axis;   wherein the absorbent core has a Relative Wet Caliper Increase (RWCI) after compression of less than 10.0%; and   wherein the core wrap is at least partially sealed along the edges of the core.   
     
     
         15 . The absorbent core of  claim 14 , wherein the absorbent material comprises at least about 90% of the superabsorbent polymers by total weight of the absorbent material. 
     
     
         16 . The absorbent core of  claim 14 , wherein the absorbent material is substantially free of natural or synthetic fibers. 
     
     
         17 . The absorbent core of  claim 14 , comprising from about 5 g to about 60 g of superabsorbent polymers. 
     
     
         18 . The absorbent core of  claim 14 , wherein the caliper of the core, as measured at the crotch point, is from about 0.25 mm to about 5.0 mm. 
     
     
         19 . The absorbent core of  claim 14  further comprising a Wet Compression Force of about 5 N or less. 
     
     
         20 . An absorbent article comprising: a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core positioned between the topsheet and the backsheet; wherein the absorbent core comprises the absorbent core of  claim 14 .