Abstract:
There is provided a polarization film, a visible latent image article, and a manufacturing method thereof enabling a latent image using a birefringent property to be provided in a visualized state. A polarization film includes a polarization layer transmitting a specific linear polarization component, a circular polarization component, or an elliptical polarization component, and an adhesive layer, a tensile modulus of elasticity E of the polarization film is 0.01 GPa to 7.8 GPa, and a thickness h of the polarization film is 60 μm to 300 μm, and in a visible latent image article which includes the polarization film and the article having a birefringent pattern, the polarization film is peelably affixed to the article having a birefringent pattern through the adhesive layer, and thus a latent image due to the birefringent pattern is visible by the polarization film.
Abstract:
The present invention provides a method for producing a laminate film comprising forming a layer by curing a liquid crystalline composition containing a liquid crystalline compound that has a polymerizable group and is solid at 25° C. and forming, on the layer, a polymer layer from a composition containing a polymer, the liquid crystalline compound migrating into the polymer layer after forming the polymer layer until the compound becomes 0.1% by mass to 30% by mass relative to the solid content mass of the polymer layer, wherein the method includes selecting the liquid crystalline compound and the polymer from combinations having a heat of crystallization of a mixture obtained by mixing the two at a mass ratio of 9:10, of 0.75 J/g or less. White cloudiness along with crystallization of the liquid crystalline compound is not generated easily in the method of the present invention.