Volume Hologram Comprising Expansion Agent Layer or Contraction Agent Layer for Creating Color Patterns

A process for the production of a security element in the form of a multi-layer film body, a lamination film or a transfer film, including the steps:

• a1) providing a carrier film,
• b1) applying a volume hologram layer formed from a photopolymer to the carrier film,
• c1) applying at least one expansion agent and/or contraction agent to the volume hologram layer, wherein at least one mask layer is partially applied to the volume hologram layer and then a full-area layer of the at least one expansion agent and/or contraction agent is applied to the mask layer and regions free therefrom of the volume hologram layer,
• d1) allowing at least partial diffusion of the at least one expansion agent and/or contraction agent into the volume hologram layer with local expansion and/or contraction of the Bragg grating, thereby providing a second item of optical information,
• wherein the carrier film, the volume hologram layer, the mask layer, the at least one expansion agent and/or contraction agent are arranged as follows:
• carrier film,
• volume hologram layer,
• mask layer,
• expansion agent and/or contraction agent,
• wherein the mask layer is at least partially impervious to the at least one expansion agent and/or contraction agent and has openings which are pervious to the at least one expansion agent and/or contraction agent,
• and wherein different refractive indices are formed region-wise in the photopolymer of the volume hologram layer, which provide a Bragg grating with the provision of a first item of optical information.

A process for the production of a security element in the form of a multi-layer film body, a lamination film or a transfer film, including the steps:

• a2) providing a carrier film,
• b2) partially applying at least one expansion agent and/or contraction agent to the carrier film, wherein at least one full-area layer of the at least one expansion agent and/or contraction agent is applied to the carrier film and then at least one mask layer is partially applied to the at least one expansion agent and/or contraction agent,
• c2) applying a volume hologram layer formed from a photopolymer to the at least one expansion agent and/or contraction agent and the mask layer which partially covers over the at least one expansion agent and/or contraction agent, and
• d2) allowing at least partial diffusion of the at least one expansion agent and/or contraction agent into the volume hologram layer with local expansion and/or contraction of the Bragg grating, thereby providing a second item of optical information,
• wherein the carrier film, the volume hologram layer, the mask layer, the at least one expansion agent and/or contraction agent are arranged as follows:
• carrier film,
• expansion agent and/or contraction agent,
• mask layer,
• volume hologram layer,
• wherein the mask layer is at least partially impervious to the at least one expansion agent and/or contraction agent and has openings which are pervious to the at least one expansion agent and/or contraction agent, and
• wherein different refractive indices are formed region-wise in the photopolymer of the volume hologram layer, which refractive indices provide a Bragg grating with the provision of a first item of optical information.