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WO-2026094990-A1 - FILM LAMINATE

WO2026094990A1WO 2026094990 A1WO2026094990 A1WO 2026094990A1WO-2026094990-A1

Abstract

As shown in fig. 1, a film laminate 100 of the present invention has a transparent resin layer 110, an ultraviolet curable adhesive layer 120, an ultraviolet curable print layer 130, and a substrate resin layer 140, in this order. Both the ultraviolet curable adhesive layer 120 and the ultraviolet curable print layer 130 have a cured product of an ultraviolet curable resin. At least one layer among the ultraviolet curable adhesive layer 120 and the ultraviolet curable print layer 130 has a cured product of an isocyanate and an ultraviolet curable resin.

Inventors

  • YAMAMOTO, RYOSUKE
  • SEKIMOTO, Junki
  • OSAWA, Azusa

Assignees

  • 共同印刷株式会社

Dates

Publication Date
20260507
Application Date
20251030
Priority Date
20241031

Claims (8)

  1. It comprises a transparent resin layer, an ultraviolet-curable adhesive layer, an ultraviolet-curable printing layer, and a base resin layer in this order. Both the adhesive layer and the printing layer have a cured product of an ultraviolet-curable resin, and at least one of the adhesive layer and the printing layer has an isocyanate and a cured product of an ultraviolet-curable resin. Film laminate.
  2. The laminate according to claim 1, wherein the lamination strength of the film laminate is 3.0 N/15 mm or more.
  3. The laminate according to claim 1 or 2, wherein the transparent resin layer is an outer sealant layer.
  4. The laminate according to any one of claims 1 to 3, wherein the UV-curable resin is an acrylic resin.
  5. The laminate according to any one of claims 1 to 4, wherein the ultraviolet-curable printing layer is a flexographic ink layer.
  6. The laminate according to any one of claims 1 to 5, wherein the isocyanate is a polyisocyanate.
  7. A laminate for laminate tube containers, as described in any one of claims 1 to 6.
  8. A laminate tube container having the laminate described in claim 7.

Description

film laminate This invention relates to a film laminate. UV-curing inks are inks that harden through a photochemical reaction caused by the energy of ultraviolet light. They possess characteristics such as fast drying, high film properties, and being solvent-free, and are used in various printing fields. Various structures are known for film laminates printed with ultraviolet-curing inks (UV inks). Patent Document 1 discloses a tube laminate comprising a laminated surface layer, an adhesive layer, a UV ink layer, and a substrate laminate. The surface layer contains polyolefin, the adhesive layer is formed from a two-component adhesive consisting of a polyol with an ester portion and a polyisocyanate, the surface of the substrate laminate in contact with the UV ink layer is made of polyolefin, and the UV ink layer is positioned at a location corresponding to the sealing portion on the surface of the substrate laminate. According to the invention of Patent Document 1, the lamination strength is improved between the surface layer and the UV ink layer, thereby preventing aggregation and delamination, and preventing the surface layer from lifting due to stress. Furthermore, Patent Document 2 discloses a method for manufacturing a raw material for tube containers, characterized by forming a printed layer using ultraviolet-curable ink on a single-layer sheet made of polyethylene layers or a multi-layer sheet whose surface is a polyethylene layer, applying an ultraviolet-curable adhesive on the printed layer to form an ultraviolet-curable adhesive layer, and then bonding a polyethylene film to the sheet via the ultraviolet-curable adhesive layer to form a protective layer for the printed layer. According to the invention of Patent Document 2, a synthetic resin film can be applied to the printed layer of the raw material, allowing for the production of a raw material for tube containers using a simple manufacturing method and with a small number of manufacturing steps, without requiring large-scale manufacturing equipment. Figure 1 is a side cross-sectional view of one embodiment of the film laminate of the present invention. 《Laminated film》 The film laminate of the present invention is It comprises a transparent resin layer, an ultraviolet-curable adhesive layer, an ultraviolet-curable printing layer, and a base resin layer in this order. Both the adhesive layer and the printing layer have a cured product of an ultraviolet-curable resin, and at least one of the adhesive layer and the printing layer has an isocyanate and a cured product of an ultraviolet-curable resin. According to the present invention, it is possible to provide a film laminate with high lamination strength and high productivity. The inventors of this invention have found that when a transparent resin layer and an ultraviolet-curable printed layer are bonded using an ultraviolet-curable adhesive layer, the adhesive strength between the ultraviolet-curable printed layer and the ultraviolet-curable adhesive layer is low. While not limited to theory, one possible reason for this is that because the ultraviolet-curable printed layer is cured by ultraviolet irradiation before the ultraviolet-curable adhesive layer is laminated, a condition similar to a so-called cold joint occurs, resulting in insufficient adhesion between the layers. In contrast, the inventors have found that by having at least one of the UV-curable adhesive layer and the UV-curable printing layer contain cured products of isocyanate and UV-curable resin, the adhesive strength of these layers is increased, and the lamination strength of the film laminate is enhanced. While not limited to theory, this is thought to be due to the adhesion resulting from the reaction and curing of the isocyanate with the hydroxyl groups of the resin constituting the UV-curable adhesive layer and/or UV-curable printing layer. Specifically, as shown in Figure 1, the film laminate 100 comprises a transparent resin layer 110, an ultraviolet-curable adhesive layer 120, an ultraviolet-curable printing layer 130, and a base resin layer 140 in this order. Of the isocyanate and ultraviolet-curable resin cured products present in the ultraviolet-curable printing layer 130, the isocyanate is thought to form urethane bonds by bonding with the hydroxyl groups present in the resin constituting the ultraviolet-curable adhesive layer 120, thereby enhancing the adhesive strength between the ultraviolet-curable adhesive layer 120 and the ultraviolet-curable printing layer 130. Note that the isocyanate and ultraviolet-curable resin cured products may be present only in the ultraviolet-curable adhesive layer 120, or both in the ultraviolet-curable adhesive layer 120 and the ultraviolet-curable printing layer 130. The following describes each component of the present invention. The film laminate of the present invention comprises a transparent resin layer, an ultraviolet-curable adhesive layer, an ultraviolet-curable printin