Adhesive wafer for attaching a waste collecting pouch to a body

Abstract

An adhesive wafer for attaching a waste collecting pouch to a body includes a backing layer, a skin-facing adhesive layer, and an absorbing adhesive layer. The skin-facing adhesive is liquid impermeable and has a water absorption capacity less than 8 weight % and a moisture vapor transmission rate (MTVR) at least as high as 150 g/m 2 /24 h. The absorbing adhesive layer is disposed between the backing layer and the skin-facing adhesive layer. The absorbing adhesive layer has a water absorption capacity at least as high as 15 weight %.

1 . An adhesive wafer for attaching a waste collecting pouch to a body, the adhesive wafer comprising:
 a backing layer;   a skin-facing adhesive layer, the skin-facing adhesive being liquid impermeable and having a water absorption capacity less than 8 weight % and a moisture vapor transmission rate (MTVR) at least as high as 150 g/m 2 /24 h; and   an absorbing adhesive layer disposed between the backing layer and the skin-facing adhesive layer, the absorbing adhesive layer having a water absorption capacity at least as high as 15 weight %.   
     
     
         2 . The adhesive wafer of  claim 1 , wherein the absorbing adhesive layer includes absorbent particles. 
     
     
         3 . The adhesive wafer of  claim 2 , wherein the absorbent particles are selected from the group consisting of salts, hydrocolloids, microcolloids, and super absorbers. 
     
     
         4 . The adhesive wafer of  claim 1 , wherein the absorbing adhesive layer has a water absorption capacity between 15% and 48%. 
     
     
         5 . The adhesive wafer of  claim 1 , wherein the MVTR of the skin-facing adhesive layer is between 150 g/m 2 /24 h and 1,800 g/m 2 /24 h. 
     
     
         6 . The adhesive wafer of  claim 1 , wherein the skin-facing adhesive layer has a water absorption capacity less than 4 weight %. 
     
     
         7 . The adhesive wafer of  claim 1 , wherein the skin-facing adhesive layer includes a polymer that absorbs less than 5 weight % water and has a MVTR at least as high as 100 g/m 2 /24 h. 
     
     
         8 . The adhesive wafer of  claim 7 , wherein the polymer is selected from the group consisting of polypropyleneoxide, polyurethane, ethylene vinyl acetate, silicone, polyacrylate, and mixtures thereof. 
     
     
         9 . The adhesive wafer of  claim 7 , wherein the skin-facing adhesive layer consists of:
 the polymer; and optionally:
 a residue of a cross linker; and 
 a residue of a catalyst. 
   
     
     
         10 . The adhesive wafer of  claim 1 , wherein the skin-facing adhesive layer covers all of a skin-facing surface of the adhesive wafer. 
     
     
         11 . The adhesive wafer of  claim 1 , further comprising a polymer material layer disposed between the backing layer and the absorbent adhesive layer 
     
     
         12 . A body waste collecting device comprising:
 a collecting pouch; and   an adhesive wafer for connecting the collecting pouch to the body, the adhesive wafer including
 a backing layer; 
 a skin-facing adhesive layer, the skin-facing adhesive being liquid impermeable and having a water absorption capacity less than 8 weight % and a moisture vapor transmission rate (MTVR) at least as high as 150 g/m 2 /24 h; and 
 an absorbing adhesive layer disposed between the backing layer and the skin-facing adhesive layer, the absorbing adhesive layer having a water absorption capacity at least as high as 15 weight %. 
   
     
     
         13 . The collecting device of  claim 12 , wherein the skin-facing adhesive layer has a water absorption capacity less than 4 weight %. 
     
     
         14 . The collecting device of  claim 12 , wherein the skin-facing adhesive layer includes a polymer selected from the group consisting of polypropyleneoxide, polyurethane, ethylene vinyl acetate, silicone, polyacrylate, and mixtures thereof. 
     
     
         15 . The collecting device of  claim 12 , wherein the adhesive wafer includes an aperture for receiving a stoma. 
     
     
         16 . The collecting device of  claim 12 , wherein the collecting pouch is detachable from the adhesive wafer. 
     
     
         17 . The collecting device of  claim 12 , wherein the collecting pouch is integrated with the adhesive wafer. 
     
     
         18 . A method for making an adhesive wafer for attaching a waste collecting pouch to a body, the method comprising:
 forming a low absorbing adhesive mixture;   curing the low absorbing adhesive mixture to form a low absorbing adhesive layer having a water absorption capacity less than 8 weight % and a moisture vapor transmission rate (MTVR) at least as high as 150 g/m 2 /24 h;   forming a high absorbing adhesive mixture;   placing the high absorbing adhesive mixture between the low absorbing adhesive layer and a backing layer; and   curing the high absorbing adhesive mixture to form a high absorbing adhesive layer having a water absorption capacity at least as high as 15 weight %.   
     
     
         19 . The method of  claim 18 , wherein forming the low absorbing adhesive mixture includes mixing together:
 a polymer selected from the group consisting of polypropyleneoxide, polyurethane, ethylene vinyl acetate, silicone, polyacrylate, and mixtures thereof;   a cross linker; and   a catalyst.   
     
     
         20 . The method of  claim 18 , wherein forming the high absorbing adhesive mixture includes mixing together:
 a polymer selected from the group consisting of polypropyleneoxide, polyurethane, ethylene vinyl acetate, silicone, polyacrylate, and mixtures thereof;   a cross linker;   a catalyst; and   absorbent particles selected from the group consisting of salts, hydrocolloids, microcolloids, and super absorbers.