Laminate, card, method of manufacturing card, method of producing card, card information recording sheet and card including the same
A laminate of the present invention includes, in a thickness direction of the laminate, a transfer foil in which at least a patch substrate, a relief forming layer, a reflective layer, and an adhesive layer are sequentially laminated, a protective sheet that is provided on a first side of the transfer foil in the thickness direction, and an information recording sheet that is provided on a second side of the transfer foil facing away from the protective sheet in the thickness direction.
1. A laminate, comprising: in a thickness direction of the laminate,
a transfer foil in which at least a patch substrate, a relief forming layer, a reflective layer, and an adhesive layer are sequentially laminated;
a protective sheet that is provided on a first side of the transfer foil in the thickness direction; and
an information recording sheet that is provided on a second side of the transfer foil facing away from the protective sheet in the thickness direction, wherein
the relief forming layer includes a relief structure having a concavo-convex shape composed of concavities and convexities on at least part of a first surface of the relief forming layer in contact with the reflective layer,
a second surface of the reflective layer in contact with the first surface has a shape corresponding to the concavo-convex shape of the relief structure,
the relief forming layer is composed of one or a combination of a thermoplastic resin, a thermosetting resin, and an ultraviolet curable resin,
the relief structure has a plurality of island regions that are arranged in a predetermined pattern and a sea region on the first surface as viewed in the thickness direction,
in the island regions, the relief forming layer has one or a combination of functional groups including a hydroxyl group, a carboxyl group, and a carbonyl group and a rough surface, and
in the sea region, the relief forming layer has neither the functional groups nor the rough surface, or a content of the functional groups is smaller than in the island regions, or a roughness degree and an area of the rough surface are smaller than in the island regions, wherein a ratio of an area of the island regions to a total area of an entire region including the island regions and the sea region is 50% or more and 80% or less.
2. The laminate of claim 1 , wherein
the relief forming layer has
a first relief region having a first relief structure in which each of the concavities and the convexities extends in a first direction along the thickness direction and the concavities and the convexities are alternately arranged in a second direction perpendicular to the first direction, and
a second relief region having a second relief structure that has a directivity in a direction different by at least 30 degrees or more from the first direction as viewed in a direction perpendicular to a plane including the first direction and the second direction or in which the concavities and the convexities are irregularly arranged, and
the first relief region is disposed to overlap with the sea region and the second relief region is disposed to overlap with the island regions as viewed in the thickness direction.
3. The laminate of claim 1 , wherein
the island regions have the same shape and are regularly arranged, and
a distance between centers of adjacent ones of the island regions is 40 μm or more and 400 μm or less.
4. The laminate of claim 1 , wherein
the relief forming layer has
a first relief region having a first relief structure in which each of the concavities and the convexities extends in a first direction along the thickness direction and the concavities and the convexities are alternately arranged in a second direction perpendicular to the first direction, and
a second relief region having a second relief structure that has a directivity in a direction different by at least 30 degrees or more from the first direction as viewed in a direction perpendicular to a plane including the first direction and the second direction or in which the concavities and the convexities are irregularly arranged, and
the first relief region is disposed to overlap with the sea region and the second relief region is disposed to overlap with the island regions as viewed in the thickness direction.
5. A laminate, comprising: in a thickness direction of the laminate,
a transfer foil in which at least a patch substrate, a relief forming layer, a first reflective layer, a second reflective layer, and an adhesive layer are sequentially laminated;
a protective sheet that is provided on a first side of the transfer foil in the thickness direction; and
an information recording sheet that is provided on a second side of the transfer foil facing away from the first side in the thickness direction, wherein
at least one of the first reflective layer and the second reflective layer is composed of a light transmissive material having a higher refractive index than the relief forming layer and the adhesive layer,
the relief forming layer includes a relief structure having a concavo-convex shape composed of concavities and convexities on at least part of a first surface of the relief forming layer in contact with the first reflective layer,
a second surface of the first reflective layer in contact with the first surface has a shape corresponding to the concavo-convex shape of the relief structure,
the first reflective layer has a surface shape corresponding to a surface shape of the second reflective layer at an interface at which the first reflective layer is in contact with the second reflective layer,
the transfer foil has a plurality of regions that are arranged in a predetermined pattern as viewed in the thickness direction and include a first region and a second region,
the first region includes the first reflective layer and the second reflective layer,
the second region includes only the first reflective layer,
an interfacial adhesion strength between the first reflective layer and the adhesive layer is different from an interfacial adhesion strength between the second reflective layer and the adhesive layer, and
the first region or the second region, whichever has a relatively high interfacial adhesion strength at an interface with the adhesive layer, is island regions scattered in the other region, and the first region or the second region, whichever has a relatively low interfacial adhesion strength at an interface with the adhesive layer, is a sea region that surrounds the region having a relatively high interfacial adhesion strength at the interface with the adhesive layer.
6. The laminate of claim 5 , wherein
an interfacial adhesion strength at an interface between the layers of the transfer foil is lower than an interfacial adhesion strength between the transfer foil and the protective sheet or the information recording sheet, and
an interfacial adhesion strength between the patch substrate and the relief forming layer and a breaking strength of the relief forming layer are lower than an interfacial adhesion strength between the first reflective layer and the second reflective layer and an interfacial adhesion strength between the relief forming layer and the first reflective layer.
7. The laminate of claim 5 , wherein
in the island regions, the first reflective layer or the second reflective layer and the adhesive layer both have hydrophilic surface properties, or both have hydrophobic surface properties, and in the sea region, the first reflective layer or the second reflective layer and the adhesive layer have different surface properties, or have the same surface properties as in the island regions, and
a contact angle of a coating liquid of the adhesive layer with the first reflective layer or the second reflective layer is lower in the island regions.
8. The laminate of claim 5 , wherein in the island regions, the first reflective layer or the second reflective layer is adhered to the adhesive layer by at least one chemical interaction of an ionic bond, a covalent bond, and a hydrogen bond, and in the sea region, the first reflective layer or the second reflective layer is adhered to the adhesive layer by a physical interaction due to an intermolecular force.
9. The laminate of claim 5 , wherein a ratio of an area of the island regions to a total area of an entire region including the island regions and the sea region is 50% or more and 80% or less.
10. The laminate of claim 5 , wherein
the island regions have the same shape and are regularly arranged, and
a distance between centers of adjacent ones of the island regions is 40 μm or more and 400 μm or less.
11. A card comprising:
the laminate of claim 5 ; and
a support layer that is provided on the first side of the transfer foil.
12. A laminate, comprising: in a thickness direction of the laminate,
a transfer foil in which at least a patch substrate, a relief forming layer, a reflective layer, and an adhesive layer are sequentially laminated;
a protective sheet that is provided on a first side of the transfer foil in the thickness direction; and
an information recording sheet that is provided on a second side of the transfer foil facing away from the protective sheet in the thickness direction, wherein
the relief forming layer includes a relief structure having a concavo-convex shape composed of concavities and convexities on at least part of a first surface of the relief forming layer in contact with the reflective layer,
a second surface of the reflective layer in contact with the first surface has a shape corresponding to the concavo-convex shape of the relief structure,
the relief forming layer is composed of one or a combination of a thermoplastic resin, a thermosetting resin, and an ultraviolet curable resin,
the relief structure has a plurality of island regions that are arranged in a predetermined pattern and a sea region on the first surface as viewed in the thickness direction,
in the island regions, the relief forming layer has one or a combination of functional groups including a hydroxyl group, a carboxyl group, and a carbonyl group and a rough surface, and
in the sea region, the relief forming layer has neither the functional groups nor the rough surface, or a content of the functional groups is smaller than in the island regions, or a roughness degree and an area of the rough surface are smaller than in the island regions,
wherein the island regions have the same shape and are regularly arranged, and
a distance between centers of adjacent ones of the island regions is 40 μm or more and 400 μm or less.