| 摘要 |
<p>PURPOSE:To attempt a further improvement in a permeability rate and selective permeability coefficient for water vapor by constituting a dehumidifying film of at least two ion exchange material layers of different fixed ion concentrations. CONSTITUTION:The titled multilayer dehumidifying film is 0.1-500mum in thickness and constituted of at least two ion exchange material layers of different fixed ion concentrations. It is preferably constituted of the first ion exchange material layer, whose fixed ion concentration is 6meq/g-H2O or smaller and whose water-absorption coefficient is 40vol.% or larger, and the second ion exchange material layer, whose fixed ion concentration is at least 0.5meq/g-H2O larger than that of the first one and whose water-absorption coefficient is 30vol.% or larger. Although this multilayer dehumidifying film has a larger film thickness, its permeability rate for water vapor is larger than that of each component single layer and its selective permeability coefficient for water vapor is improved furthermore.</p> |
