| 摘要 |
<p>PURPOSE: To manufacture a laminated film useful as a packaging material of low permeability to water vapor and good toughness for a medicine, a pesticide, a fertilizer, a cleaning agent, resin of water absorption properties and the like by sticking temporarily a resin layer composed of biodegradable resin of specified tensile yield releasably on a water-soluble layer. CONSTITUTION: In a laminated film composed of a water-soluble resin layer A and a resin layer B stuck to the resin layer A temporarily and releasably, biodegradable resin is used for the resin layer B, and the tensile yield elongation of the resin layer B is 8% or more. Also preferably in the laminated film, the tensile yield strength of the resin layer B is 8 MPa or more, and the value formed by dividing the tensile destruction elongation value of the resin layer B by the tensile yield elongation value of the resin layer B is 3 or more. The tensile yield strength, tensile yield elongation and tensile yield destruction elongation referred above are measured in compliance with the method stipulated in JIS K-7127. Also the permeability to water vapor is measured at 25 deg.C at a relative humidity of 90% in compliance with the method stipulated in JIS Z-0208.</p> |
