| abstract |
A water-soluble film comprising a polyvinyl alcohol-based resin (A), the surface opposite to the phase difference (Rα) on one surface (α surface) side of the central portion in the width direction (TD) of the water-soluble film ( It is a water-soluble film having a difference (ΔR) in retardation (Rβ) on the (β plane) side of 8 nm or less. For this reason, the difference in crystallinity between the front and back surfaces of the water-soluble film is reduced, and a water-soluble film with less curling and excellent productivity can be obtained. |