The invention relates to a composite sheet. Provision is made for the composite sheet to comprise a polymeric base sheet and a polymeric varnish layer, said varnish layer having
Description
The invention is illustrated below with reference to drawings, in which
FIG. 1 shows a first embodiment of a composite sheet of the invention, which is composed of a base sheet and a varnish layer; and
FIG. 2 shows a second embodiment of a composite sheet of the invention, which is composed of a base sheet, a varnish layer and an adhesive layer.
Claims
1. Composite sheet comprising a polymeric base sheet and a polymeric varnish layer, said varnish layer having
an abrasion resistance, expressed as pencil hardness, of at least 4H; anda flexibility such that, when the composite sheet is bent around the two closely adjacent edges of a metal strip 100 μm thick, the varnish layer does not break or delaminate from the base sheet;and said varnish layer having the following optical properties:a transmittance at 400, 600 and 800 nm of at least 85%, determined by applying the varnish layer-forming formulation with a thickness of 5 μm to a slide, curing the varnish layer and determining the transparency of the slide with the varnish layer in comparison to an uncoated slide; anda turbidity of not more than 5%, determined by haze measurement.
2. Composite sheet according to claim 1, characterized in that the varnish layer has a surface roughness of not more than 0.3 μm, determined as the average value from three determinations of the greatest height of the surface profile in the coating direction.
3. Composite layer according to claim 1, wherein the varnish layer has a basis weight of 0.5 to 50 g/m2.
4. Composite layer according to claim 1, wherein the varnish layer is of multi-layer construction.
5. Composite layer according to claim 1 wherein the varnish layer is coated onto the base sheet.
6. Composite sheet according to claim 1, wherein between the varnish layer and the base sheet there is at least one further layer.
7. Composite sheet according to claim 1, wherein the varnish layer is produced from a formulation comprising at least one compound containing at least one (meth)acrylate function and at least one compound containing at least two (meth)acrylate functions.
8. Composite sheet according to claim 1, wherein the varnish layer is produced from a formulation which is free from silicone-containing additives.
9. Composite sheet according to claim 1, wherein the base sheet has a layer thickness of 5 μm to 500 μm.
10. Composite sheet according to claim 1, wherein the base sheet has a multi-layer construction.
11. Composite sheet according to claim 1, wherein the base sheet is transparent and colourless; transparent and coloured; or not transparent and coloured.
12. Composite sheet according to claim 1, wherein the base sheet has been produced from a polyolefin, a polyvinyl acetate and/or a polyester.
13. Composite sheet according to claim 1, further comprising an adhesive layer.
14. Composite sheet according to claim 13, characterized in that the adhesive layer is disposed on the side of the base sheet that faces away from the varnish layer.
15. Composite sheet according to claim 13, wherein the adhesive layer is formed from a pressure-sensitive adhesive.
16. Composite sheet according to claim 13, wherein the pressure-sensitive adhesive has a basis weight of 2 g/m2 to 500 g/m2.
17. Composite sheet according to claim 13, wherein the pressure-sensitive adhesive is prepared from a random copolymer obtained from a formulation which comprises α,β-unsaturated alkyl esters of the general structure (I)
CH2═CH(R1)(COOR2) (I)where R1═H or CH3 and R2═H or linear, branched or cyclic, saturated or unsaturated alkyl radicals having 1 to 30 carbon atoms.
18. Composite sheet according to claim 13, wherein the base sheet is transparent and colourless; transparent and coloured; or not transparent and coloured.
19. Process for producing the composite sheet claim 1, comprising
applying the varnish formulation forming the varnish layer to the base sheet; andcuring the varnish formulation to form the varnish layer.
20. Process according to claim 19, characterized in that the varnish formulation is applied in web form with a working width of at least 30 cm to the base sheet.
21. Process according to claim 20, characterized in that the varnish formulation is applied in web form with a working width of at least 50 cm to the base sheet.
22. Process according to claim 19, wherein, after the varnish formulation has been applied to the base sheet and before the varnish formulation is cured, the varnish formulation is covered on the side facing away from the base sheet with a protective sheet.
23. Process according to claim 22, characterized in that the protective sheet is removed after the varnish layer has been cured and before the composite sheet is applied to a substrate.
24. Process according to claim 19, wherein the adhesive layer is applied to the base sheet before or after the varnish formulation is applied to the base sheet.
25. A decorative, information-carrying or data-containing sheet or to a coated substrate comprising the composite sheet of claim 1.
26. The coated substrate of claim 25, wherein said substrate is an automotive component or a part of cars a car.
27. A self-adhesive sheet, tape or label comprising a single sidedly self-adhesive composite sheet of claim 1.
28. A decoration-carrying, information-carrying and/or data-containing self-adhesive tape, sheet or label comprising a single-sidedly self-adhesive composite sheet of claim 1.
29. A decoration carrying, information-carrying or data-containing self-adhesive tape, sheet or label of claim 28 wherein said decoration, information or data are holograms, microtexts, microscripts and/or images, the data content of said individual holograms optionally including not only digital information but also microtexts, microscripts and/or microimages.
30. A method for fixing decoration, information and/or data on packaging, products, components, automotive parts or parts of cars, which comprises fixing said decoration, information and/or data on said packaging, products, components, automotive parts or parts of cars with the single-sidedly self-adhesive composite sheet of claim 28.
31. Composite sheet according to claim 14, wherein the adhesive layer is formed from a pressure-sensitive adhesive.
Patent Application
20070166536
