MATERIAL TO FORM A HYDROGEL
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).