Cellulosed molded article having a functional effect and method for producing the same

Abstract

The invention relates to a method for producing cellulosed molded articles having a functional effect. The method is characterized by charging cellulosed fibers or films with incorporated ion exchangers having bactericidal metal ions and/or ionic pharmaceutical active substances in such a manner that a depot of these active substances is built up in the fiber. Said depot time releases the active substances in the amount of the corresponding equivalent concentration when the fibers and films are used in aqueous solutions. The invention also relates to molded articles produced according to the inventive method.

1 . A method for producing a cellulosic form that releases active agents in an amount that reaches equilibrium in an aqueous solution, the method comprising: incorporating within a cellulosic solution a weakly linked cation-active ion exchanger loaded with bactericide metal ions and/or with ionic, pharmaceutic agents in such a manner, that a depot of said agents is created within the fiber and that said depot releases the agents in an amount of the equilibration concentration upon application of these fibers or foils in aqueous solutions.  
     
     
         2 . The method according to  claim 1 , wherein the weakly linked, cation-active ion exchanger is a poly-acrylate.  
     
     
         3 . The method according to  claim 1 , wherein the metal ions comprise silver ions.  
     
     
         4 . The method according to  claim 3 , further comprising additional bactericidally active metal ions, including copper-, mercury-, zirconia- or zinc ions.  
     
     
         5 . The method according to  claim 1 , wherein the ionic pharmaceutic agents are anion-active agents, including benzoic acid or sorbic acid.  
     
     
         6 . The method according to  claim 1 , wherein the concentration of the active agents is in the range of 0.005 g to 100 g per kg of the cellulosic form.  
     
     
         7 . The method according to  claim 1 , wherein the cellulosic form is a fibre, which has been loaded with active agents, blended with textile fibers and processed into area-measured material.  
     
     
         8 . The method according to  claim 7 , wherein the textile fibers are selected from the group comprising cotton, wool, polyester-fibers, polyamide-fibers, polyacryl-fibers, polypropylene-fibers or cellulosic synthetic fiber.  
     
     
         9 . The method according to  claim 2 , wherein the cellulosic form further comprises cation-active and/or anion-active ion-exchangers.  
     
     
         10 . A cellulosic form, characterised in that said form contains weakly linked cation-active ion exchangers, wherein the ion exchanger is loaded with bactericidal metal ions and/or ionic pharmaceutic agents and that said form releases in aqueous solutions the metal ions and/or agents at a concentration corresponding to the current equilibration concentration.  
     
     
         11 . The cellulosic form according to  claim 10 , characterised in that the metal ions are at least in part silver ions.  
     
     
         12 . The cellulosic form according to  claim 11 , wherein the form is a fiber and is intermixed with a compatible material to form a mixture.  
     
     
         13 . The cellulosic form according to  claim 12 , wherein the mixture is used to form a paper, a sausage casing or a non-woven fabric.  
     
     
         14 . A lyocell-type cellulosic form containing an active agent that is released from the material relative to the concentration of the active agent in an aqueous solution contacting the material, the material comprising: 
 a mixture of a cellulosic material, active agent and a polymeric resin with cross-linkers in an amount from about 0.1 to 2.0 weight % of the resin and wherein the amount of active agent in the material is proportional to the amount of polymeric resin in the mixture.    
     
     
         15 . The lyocell-type cellulosic form according to  claim 14 , wherein the polymeric resin is polyacrylate and the active agent is silver ions.  
     
     
         16 . The lyocell-type cellulosic form according to  claim 15 , wherein the form is a fiber for producing a woven or non-woven fabric.  
     
     
         17 . A method of producing a lyocell-type cellulosic form containing an active agent that is released from the material relative to the concentration in an aqueous solution contacting the material, the method comprising: 
 providing a cellulosic material comprising cellulose homogenized in N-methylmorpholine-N-oxide monohydrate;    mixing in a polyacrylate polymer in a form that is intermixed with the cellulosic material;    forming cellulosic/polymer fibres;    removing residual N-methylmorpholine-N-oxide monohydrate from the cellulosic/polymer fibres;    contacting the cellulosic/polymer fibers to a solution of silver nitrate for a sufficient time to load the cellulosic/polymer fibers with silver ions in an amount proportional to the amount of polyacrylate polymer introduced into the cellulosic material.