| 摘要 |
PROBLEM TO BE SOLVED: To provide a water-soluble film having excellent solubility, a packaging bag using the water-soluble film, a content emitter using the water-soluble film, and method for producing water-soluble film.SOLUTION: The water-soluble film is obtained by making a film of a raw material comprising a polyvinyl alcohol-based resin and a bisulfite. A bisulfite is added to the raw material containing a polyvinyl alcohol-based resin. By doing so, deterioration in solubility of the water-soluble film is suppressed, even when the raw material is made into a film after being kept in a warmed state for a prescribed time. Further, this effect is specific to a bisulfite, and cannot be obtained when a sulfite is used.SELECTED DRAWING: None |
