| abstract |
A polyvinyl acetal ionomer resin film having high Young's modulus and high elongation at break. The polyvinyl acetal ionomer resin film according to the present invention comprises a polyvinyl acetal ionomer resin containing polyvinyl acetal into which an acid group is introduced, wherein the polyvinyl acetal ionomer resin has an acid value of 1.5 mol% or more, 10% by mole or less, and the neutralization degree of the polyvinyl acetal ionomer resin is 10% or more and 90% or less. |