Patent DE-102006037431-A1 (DE)
Title: Production of multi-layer bodies useful in element for security- and value document such as banknotes and credit cards, by forming a relief structure in an area of replication layer and applying a layer on carrier and/or replication layer
Inventor: STAUB RENE
IPC: B44F1/12
Filed: 2006-08-09
Abstract: The procedure for the production of multi-layer bodies useful in security element for security and value document such as banknotes and credit cards, comprises forming a first relief structure in a first area of a replication layer, applying and then exposing a first layer in the form of a first photoresist lacquer layer on a carrier layer/a replication layer (3) in first and second area, and determinedly structuring the first layer through the first relief structure. The multi-layer body (100) has partially formed functional layer (2) in register with a further partially formed layer. The procedure for the production of multi-layer bodies useful in security element for security and value document such as banknotes and credit cards, comprises forming a first relief structure in a first area of a replication layer (3), applying and then exposing a first layer in the form of a first photoresist lacquer layer on a carrier layer/a replication layer in first and second area, and determinedly structuring the first layer through the first relief structure. The multi-layer body has partially formed functional layer in register with a further partially formed layer. The partially formed functional layer is formed directly and/or under use of the structured first layer as a mask layer and formed by subjecting second photoresist lacquer layer staggered with coloring agent. Two different second relief structures are formed in the second area. The first and/or the second relief structure are formed as a diffractive relief structure with a depth/width ratio of the individual structure element of less than 0.3 and as light diffracting, scattering, diffusing and/or focusing micro/nano structure, isotropic/anisotropic matt structure, binary/continuous Fresnel lens, as microprism structure, as blaze lattice and/or as micro structure. A spatial frequency of the first relief structure is less than 1000 line/mm. The first layer is subjected with a constant surface density related to a plain stretched by the replication layer, is introduced in an etching process by acid/lye or introduces itself as an absorption layer for its partial ablation by the introduction of a laser light, and is formed in a layer thickness, so that the transparency of the first layer is increased/reverses in the first and the second area. A photoactivable layer is subjected as first photosensitive lacquer layer on the first layer/the replication layer and formed through the first photosensitive washcoat layer. The structuring of the exposed laquer/washcoat layer is carried out under use of the structured lacquer layer as a mask layer. The activable area of the photoactivable layer forms a caustic for the first layer, so that the first layer is removed and structured in the first area. The structured first lacquer/washcoat layer forms directly to the functional layer. The functional and/or the further layer is formed by subjecting positive/negative photoresist lacquer layer (12) with the coloring agent. An adhesion characteristic, diffusion resistance and/or surface activity of the replication layer is locally influenced by the arrangement of the first relief structure, so that powder/fluid medium for the formation of the first layer adheres locally on the replication layer, which is formed partially through the diffusion of the coloring agent as the functional layer. The further layer functions locally as diffusion barrier on the replication layer. The first layer is subsequently structured after a physical/chemical processing of the powder/fluid medium. The first and the second relief structures are surrounded vertically to the plain of the replication layer viewed by the functional layer/further layer. The first layer is structured by drawing-off with a drawing knife/doctor blade. The second photoresist lacquer layer is exposed through the structured first layer and then structured. The carrier layer is partially formed through the diffusion of the coloring agent as partially formed functional layer or further layer. The first and the second lacquer layer function as diffusion barrier. The partially formed functional layer is formed as a lacquer layer or a polymer layer under supply of non-metallic or colored functional layer materials, and/or as hydrophobic or hydrophilic layer through the first layer, colored positive or negative photoresist lacquer layer, optically variable layer with different optical effect, a metallic reflection layer and/or a dielectric reflection layer. The optically variable layer is formed through a material with different optical effect, liquid crystal layer with different optical effect and/or thin film-reflection layer stack with interference color effect. The structured first layer is completely removed and substituted through the functional layer and further layer. A first transparent guard film is arranged between the functional layer and the further layer and a second transparent guard film is arranged between the two further partially formed layers. The first and the second guard films are formed locally in two different layer thickness of 2-50 mu m. The first layer is completely applied in a thickness on the replication layer or the carrier layer and possesses an optical density of 2-7. The functional layer and the further layer are sectionally formed in linear manner such a way that they are subjected itself vertically to the plain of the replication layer or the carrier layer viewed mutually to a decorative element from two lines contained in different functional layer material. The lines pass over without lateral offset in each other and form a concentric circle line with a continuous gradient passing with one another vertical to the plain of the replication layer or the carrier layer with a width of 0.5-50mu m. The partially formed functional layer is dyed with an optical or transparent coloring agent, is induced outside of the visible spectrum and produces a visually recognizable colored impact. The coloring agent is pigments or dye. The replication layer is arranged on the carrier layer, which is detachably formed by multi-layer body. Independent claims are included for: (1) multi-layer body; (2) security element for security- or value document; and (3) electronic component with multi-layer body.