Method for manufacturing water-insoluble molded article and water-insoluble molded article

Abstract

A process for producing a water-insoluble shaped material, including a step of treating a raw material shaped material containing a water-soluble salt of a polyanionic polysaccharide with a treatment liquid containing an acid anhydride to insolubilize the raw material shaped material in water, and the process makes it possible to simply produce a water-insoluble shaped material in which intrinsic characteristics of the polyanionic polysaccharide being a raw material are retained, which has a high safety in that a chemical crosslinking agent is not required, and which is useful as a medical material, a food material, a cosmetic material, and the like.

1 - 16 . (canceled) 
     
     
         17 . A water-insoluble shaped material, comprising polyanionic polysaccharide in an acid form,
 wherein the water-insoluble shaped material is produced by a process comprising: treating a raw material shaped material that comprises a water-soluble salt of the polyanionic polysaccharide, with a treatment liquid comprising an acid anhydride so as to insolubilize the raw material shaped material in water and form the water-insoluble shaped material,
 wherein the treating converts the water-soluble salt of the polyanionic polysaccharide to the polyanionic polysaccharide in an acid form, and 
 the acid anhydride does not form a covalent bond with the polyanionic polysaccharide in the acid form. 
   
     
     
         18 . The water-insoluble shaped material according to  claim 17 ,
 wherein the water-insoluble shaped material is dissolved in an aqueous medium having a pH of 12 or higher.   
     
     
         19 . The water-insoluble shaped material according to  claim 17 , being a medical material, a food material, or a cosmetic material.