Material to form a hydrogel

Abstract

A soft film, a sponge, or a sheet in the dried state is provided, which is capable of forming a hydrogel absorbing water or blood. The film is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with the other remaining solution, and then drying or freeze-drying it.

1 - 17 . (canceled) 
     
     
         18 . A film to form a hydrogel, comprising: poly(acrylic acid) and polyvinylpyrrolidone, wherein the film is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with the other remaining solution, followed by being dried. 
     
     
         19 . The film according to  claim 18 , being obtainable by preparing the film-state material in the dried state from the solution of poly(acrylic acid), and bringing the film-state material into contact with the solution of polyvinylpyrrolidone, followed by being dried. 
     
     
         20 . The film according to  claim 18 , wherein the solution(s) of poly(acrylic acid) and/or polyvinylpyrrolidone include(s) poly(vinyl alcohol). 
     
     
         21 . A sheet to form a hydrogel, comprising: poly(acrylic acid) and polyvinylpyrrolidone, wherein the sheet is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with a solution including the other remaining polymer and a water-soluble polymer, followed by being frozen and then being freeze-dried. 
     
     
         22 . The sheet according to  claim 21  being obtainable by preparing the film-state material in the dried state from the solution of poly(acrylic acid), and bringing the film-state material into contact with a solution including polyvinylpyrrolidone and hyaluronic acid, followed by being frozen and then being freeze-dried. 
     
     
         23 . A powder to form a hydrogel, comprising poly(acrylic acid) and polyvinylpyrrolidone, wherein the powder is obtainable by crushing a solid that is obtainable by freeze-drying a mixed solution of poly(acrylic acid) and polyvinylpyrrolidone under the presence of a water-soluble polymer. 
     
     
         24 . A medical treatment material comprising at least one of:
 a film to form a hydrogel, comprising: poly(acrylic acid) and polyvinylpyrrolidone, wherein the film is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with the other remaining solution, followed by being dried;   a sheet to form a hydrogel, comprising: poly(acrylic acid) and polyvinylpyrrolidone, wherein the sheet is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with a solution including the other remaining polymer and a water-soluble polymer, followed by being frozen and then being freeze-dried; and   a powder to form a hydrogel, comprising poly(acrylic acid) and polyvinylpyrrolidone, wherein the powder is obtainable by crushing a solid that is obtainable by freeze-drying a mixed solution of poly(acrylic acid) and polyvinylpyrrolidone under the presence of a water-soluble polymer.   
     
     
         25 . The medical treatment material according to  claim 24 , wherein the material is an adhesion barrier, a hemostatic device, or a wound covering material. 
     
     
         26 . The film according to  claim 19 , wherein the solution(s) of poly(acrylic acid) and/or polyvinylpyrrolidone include(s) poly(vinyl alcohol).