| 摘要 |
PURPOSE:To obtain a laminated material with non-porous properties and porous properties by constituting it of a porous layer consisting of chitosan and constituted of a three dimensional network structure with three dimensional network open-cell and a non-porous thin film layer consisting of chitosan. CONSTITUTION:A chitosan acidic aq. soln. is prepd. by dissolving chitosan in an acid aq. soln. and a part of said chitosan acidic aq. soln. is extended into a sheet, which is freeze-dried to form a porous sheet of a chitosan salt. Separately, the remaining part of the chitosan acidic aq. soln. is extended into a thin film, which is dried by evaporation to form a non-porous chitosan salt thin film. While the non-porous chitosan salt thin film is not completely dried or after one face of the dried thin film is made damp with water and it is laminated and adhered on one face of the porous sheet of chitosan salt. The laminated body is neutralized by treating it with an alkali aq. soln. to insolubilize thereby the laminated body in water and the obtd. water-insoluble chitosan laminated body is dried. The chitosan laminated material consists of the non-porous thin film layer and the porous sheet layer and is useful for a covering material of a wound and can be also used for such applications as a water retention agent and a filtering material. |
