Unknown

Abstract

An inkjet recording material having a metallic look, at least having a sheetlike substrate with a front side and a reverse side opposite the front side, a metal layer applied to the front side of the substrate by an adhesive, and an ink-absorptive layer applied atop the metal layer. The inkjet recording material having a metallic look is used as a label, photo, poster or packaging material, to a process for producing an inkjet recording material having a metallic look.

Claims

1.-15. (canceled)

16. An inkjet recording material having a metallic look, comprising: a sheetlike substrate having a front side and a reverse side opposite the front side; a metal layer; and an ink-absorptive layer applied atop the metal layer that comprises: a binder; and pigments that have a pore diameter of below 1 m measured with an aid of gas adsorption according to DIN 66135, wherein the metal layer is arranged between the sheetlike substrate and the ink-absorptive layer.

17. The inkjet recording material according to claim 16, wherein the ink-absorptive layer comprises boric acid or a borate.

18. The inkjet recording material according to claim 16, wherein the ink-absorptive layer comprises a binder selected from the group consisting of polyvinyl alcohol, copolymer of polyvinyl alcohol, ethylene-vinyl acetate copolymer, starch, styrene-butadiene latex, and styrene-acrylate latex.

19. The inkjet recording material according to claim 16, wherein the binder in the ink-absorptive layer is polyvinyl alcohol.

20. The inkjet recording material according to claim 19, wherein the polyvinyl alcohol has a degree of hydrolysis of at least one of: more than 50 mol %, more than 75 mol %, and more than 90 mol %.

21. The inkjet recording material according to claim 19, wherein the polyvinyl alcohol has a degree of polymerization of at least one of: at least 500, at least 800, and at least 1000.

22. The inkjet recording material according to claim 19, wherein the ink-absorptive layer has a proportion by mass of 0.001 to 0.1 boric acid or borate, based on the polyvinyl alcohol used as binder.

23. The inkjet recording material according to claim 16, further comprising: an adhesive configured as a polyurethane adhesive is disposed between the sheetlike substrate and the metal layer.

24. The inkjet recording material according to claim 16, wherein the ink-absorptive layer has a dry weight of at least one of: a first range from 10 to 35 g/m.sup.2, a second range from 12 to 25 g/m.sup.2, and a third range from 15 to 25 g/m.sup.2.

25. The inkjet recording material according to claim 16, wherein the ink-absorptive layer is at least one of: transparent, has a first opacity according to ISO 2471 of not more than 80%, has a second opacity according to ISO 2471 of not more than 50%, and has a third opacity according to ISO 2471 of not more than 30%.

26. The inkjet recording material according to claim 16, wherein the sheetlike substrate has an adhesive layer on the reverse side.

27. The inkjet recording material according to claim 16, wherein the metal layer is an aluminum layer, copper layer, gold layer, or metal layer.

28. The inkjet recording material claim 23, wherein the sheetlike substrate is a coated or uncoated paper, wherein the adhesive is a polyurethane adhesive, wherein the metal layer is an aluminum layer having a thickness of 15 m to 30 m, wherein the ink-absorptive layer has a dry weight in a range from 10 to 35 g/m.sup.2, wherein the binder in the ink-absorptive layer is polyvinyl alcohol, wherein the polyvinyl alcohol has a degree of hydrolysis of more than 50 mol % and a degree of polymerization of at least 500, wherein the ink-absorptive layer has a proportion by mass of 0.001 to 0.1 boric acid or borate, based on the polyvinyl alcohol used as binder, and wherein the ink-absorptive layer is one of transparent or has an opacity according to ISO 2471 of not more than 80%.

29. The inkjet recording material claim 23, configured as at least one of labels, photos, posters, books, photo books, displays, playing cards or collecting cards, entry tickets, ID cards, tags, or packaging materials.

30. The inkjet recording material claim 16, pigments that have a pore diameter of greater than 0.3 m

31. A process for producing an inkjet recording material, comprising one of: A) providing a sheetlike substrate, having a front side and a reverse side opposite the front side; providing a multilayer composite composed of a metal layer, a release layer, and a carrier layer; coating the front side of the sheetlike substrate and/or the metal layer of the multilayer composite with an adhesive; laminating the multilayer composite that has been coated with the adhesive onto the sheetlike substrate such that the adhesive is disposed between the front side of the sheetlike substrate and the metal layer; one of partly or fully drying or curing the adhesive, to result in an adhesive layer; removing the carrier layer and the release layer, corona-treating the metal layer; providing a coating composition for production of an ink-absorptive layer; applying the coating composition to the metal layer, and drying the applied coating composition to form an ink-absorptive layer; or B) providing the sheetlike substrate having the front side and the reverse side opposite the front side; coating the front side of the sheetlike substrate with the metal layer by physical gas phase deposition; providing the coating composition for production of the ink-absorptive layer; applying the coating composition to the metal layer; and drying the applied coating composition to form the ink-absorptive layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0075] The invention is described in detail hereinafter by an example and figures:

[0076] FIG. 1 describes, in schematic form, the layer structure of an inventive inkjet recording material;

[0077] FIG. 2 describes, in schematic form, the layer structure of an inventive inkjet recording material; and

[0078] FIG. 3 describes, in schematic form, the layer structure of an inventive inkjet recording material.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0079] FIG. 1 describes, in schematic form, the layer structure of an inventive inkjet recording material (10) having a metallic look. A metal layer (3) has been applied by use of a polyurethane adhesive (2) to the front side of a sheetlike substrate (1), which in the present case is a coated paper. In the embodiment described here, the metal layer (3) is an aluminum layer. The aluminum layer in the present context has a thickness of about 20 nm. An ink-absorptive layer (4) is disposed atop said metal layer (3). The ink-absorptive layer comprises a polyvinyl alcohol as binder (degree of hydrolysis 95 mol %, degree of polymerization 800), boehmite as pigment and H.sub.3BO.sub.3.

[0080] FIG. 2 describes, in schematic form, the layer structure of an inventive inkjet recording material (10) as depicted in FIG. 1. However, the inventive inkjet recording material (10) depicted in FIG. 2 additionally comprises an adhesive layer (5) on the reverse side of the sheetlike substrate (1) and a release paper disposed atop the adhesive layer (5). The adhesive layer is a polyacrylic resin adhesive, and the release paper is a silicone-coated paper that has been rendered anti-adhesive with respect to the polyacrylic resin adhesive.

[0081] FIG. 3 describes, in schematic form, the layer structure of an inventive inkjet recording material (10) having a metallic look. A metal layer (3) has been applied with the aid of physical gas phase deposition to the front side of a sheetlike substrate (1), which in the present context is a coated paper. In the embodiment described here, the metal layer (3) is an aluminum layer. The aluminum layer in the present context has a coat weight of 0.9 g/m.sup.2. An ink-absorptive layer (4) has been disposed atop said metal layer (3). The ink-absorptive layer comprises a polyvinyl alcohol as binder (degree of hydrolysis 95 mol %, degree of polymerization 800), boehmite as pigment and H.sub.3BO.sub.3.

Example: Production of an Inventive Inkjet Recording Material Having a Metallic Look

[0082] In the first step, a 70 g/m.sup.2 paper is coated with an aqueous polyurethane adhesive. Subsequently, the polyurethane adhesive-coated paper is laminated onto the aluminum layer of a single-sidedly aluminum-metallized (layer thickness 20 nm) BOPP film, with a release layer that enables the residue-free removal of the aluminum layer disposed between the aluminum layer and the BOPP (biaxially oriented polypropylene) film. The term separation layer can also find use as a synonym for release layer.

[0083] Subsequently, the polyurethane adhesive is dried and the BOPP film is removed along with the release layer.

[0084] The resulting three-layer composite consisting of paper, polyurethane adhesive layer and aluminum layer is coated with a coating composition with the aid of an intaglio printing method, and excess material is stripped off with a blade, so as to result in an application of 20 g/m.sup.2 (dry).

[0085] The coating composition is the coating composition described in example 1 of DE 69402121 T2.

[0086] The coating composition applied is dried, so as to result in an ink-absorptive layer (4) or an inventive inkjet recording material having a metallic look.

[0087] The inkjet recording material produced is notable for very good printability by inkjet printing and has a pleasing metallic look.

[0088] Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.