Abstract:
In a process for producing a multilayer body, an HRI layer made of a material having a high refractive index is applied to at least part of the surface area of a substrate. At least one partial region of the HRI layer is then physically removed from the substrate again by treatment with an alkaline solution. Additionally specified is a multilayer body that can be obtained by such a process.
Abstract:
Systems and methods are described for securing credentials with optical security features formed by quasi-random optical characteristics (QROCs) of credential substrates. A QROC can be a pattern of substrate element locations (SELs) on the substrate that includes some SELs that differ in optical response from surrounding SELs. During manufacturing, a QROC of a substrate can be characterized, hidden by a masking layer, and associated with a substrate identifier. During personalization, personalization data can be converted into an authentication graphic formed on the substrate by de-masking portions of the masking layer according to a de-masking pattern. The graphic formation can result in a representation that manifests a predetermined optical response only when the de-masking pattern is computed with knowledge of the hidden QROC. The authentication graphic and optical response can facilitate simple human authentication of the credential without complex or expensive detection equipment.
Abstract:
A method for producing a multilayer body with the steps of a) applying a first varnish layer made of a water-based photoresist to a surface of a base body; b) exposing the first varnish layer in a first region, wherein the first varnish layer is not exposed in a second region; c) removing the first varnish layer in the second region.
Abstract:
The invention relates to a method for producing a multi-layer body, in particular a security element, in which a partial first layer or partial first layer system is produced on a substrate, wherein the partial first layer or partial first layer system is present in a first partial area and not in a second partial area. Subsequently, a partial second layer or partial second layer system is produced, wherein the partial second layer or partial second layer system is present in a third partial area and not in a fourth partial area, and wherein the third partial area overlaps with the first and second partial areas. Finally, the partial first layer or partial first layer system is structured as a mask using the partial second layer or partial second layer system.
Abstract:
A multilayer optical film includes alternating layers of first and second optical layers; the first optical layer comprising a first polyester, wherein the first polyester comprises first dicarboxylate monomers and first diol monomers, and from about 0.25 to less than 10 mol % of the first dicarboxylate monomers have pendant ionic groups; the second optical layer comprising a second polyester; and wherein the first and second optical layers have refractive indices along at least one axis that differ by at least 0.04. The multilayer optical film may be a polarizer film, a reflective polarizer film, a diffuse blend reflective polarizer film, a diffuser film, a brightness enhancing film, a turning film, a mirror film, or a combination thereof. The multilayer optical film may also be a transaction card such as a financial transaction card, an identification card, a key card, or a ticket card. A method of making the multilayer film is also disclosed.
Abstract:
The invention concerns a process for producing a security film, comprising: a. forming a polymeric film substrate having first and second surfaces; b. plasma treating at least one surface of the polymeric film substrate using a modified atmosphere plasma treatment, wherein the modified atmosphere comprises at least one inert carrier gas and at least one functional material selected from: i. one or more oxidising fluids; ii. one or more reducing fluids; and iii. one or more polar fluids with the capacity to form ionic or covalent bonds with the at least one surface of the polymeric film substrate, wherein those oxidising fluids with a relative dielectric strength less than that of air, where present, are in the modified atmosphere in an amount less than 40% by weight or by volume; and c. contacting a foil with the at least one plasma treated surface of the polymeric film substrate such that the foil adheres to the polymeric film substrate.
Abstract:
A method of providing a security document with a security feature includes the steps of providing a conductive layer, and removing part of the conductive layer to convert at least a portion of the conductive layer into a metamaterial. The metamaterial is selected to provide for authentication of the security document. It is possible to obtain a security document with this method and to subsequently authenticate the security document.
Abstract:
A process for producing a multilayer body (100) is specified. In this process, an HRI layer (7) made of a material having a high refractive index is applied to at least part of the surface area of a substrate (4). At least one partial region (10) of the HRI layer (7) is then physically removed from the substrate (4) again by treatment with an alkaline solution. Additionally specified is a multilayer body (100) that can be obtained by such a process.
Abstract:
The present invention relates to an element comprising a surface area with a specific, optically effective surface relief microstructure (12). The surface relief microstructure has a surface modulation of top regions (13) and bottom regions (14), wherein in a first lateral direction of the surface area there is in average at least one transition from a top to a bottom region or vice versa within every 20 micrometer, and in a second lateral direction of the mask, which is perpendicular to the first direction, there is in average at least one transition from a first to a second zone or vice versa within every 200 micrometer. In the microstructure, (i) in the first direction the lateral arrangement of the transitions is non-periodic, and (ii) the top regions substantially lie in the same top relief plateau (15) and the bottom regions substantially lie in the same bottom relief plateau (16).Through scattering effects, the surface relief microstructures are suitable to display images with a positive-negative image flip, which advantageously have a distinct and saturated color appearance but at the same time do not show any rainbow colors.The invention also relates to methods for making such elements as well as to security devices comprising such elements.