Abstract:
The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.
Abstract:
The invention relates to a layered construction with a protective layer and a photoexposed photopolymer layer, the protective layer being obtainable by reaction of a mixture comprising or consisting of at least one radiation-curing resin I), a polyfunctional radiation-curing resin II) and a photoinitiator system III), the radiation-curing resin I) comprising ≦5 wt. % of compounds having a weight-average molecular weight 1000, the polyfunctional radiation-curing resin II) comprising or consisting of at least one acrylate having at least two radiation-curing groups, and the mixture comprising at least 55 wt. % of the radiation-curing resin I) and not more than 35 wt. % of the polyfunctional radiation-curing resin II). The invention further relates to a method for producing a layered construction of this kind, and also to its use.
Abstract:
The invention relates to a method for producing a security element having a holographic layer in which a hologram is arranged, characterized by at least the following steps: a) providing the holographic layer; b) exposing the holographic layer at least in sections via a master hologram to produce a hologram copy in the holographic layer; e) printing the holographic layer at least in sections with an ink, forming a printed feature, wherein the ink comprises the melt of a dye or a colorless component or a solvent and a dye dissolved therein or a colorless component dissolved therein; d) fixing the exposed holographic layer to produce the hologram in the holographic layer, wherein the printed feature and the hologram are arranged in the holographic layer such that the printed feature and the hologram overlap at least in sections. The invention further relates to a security feature which is produced or can be produced by said method.
Abstract:
The invention relates to a method for selecting compounds which can be used as additives in photopolymer formulations for producing light holographic media, and to photopolymer formulations which contain at least one softener which are selected according to the claimed method. The invention also relates to the use of photopolymer formulations for producing holographic media.
Abstract:
The subject matter of the invention is a method for producing illuminated, holographic media comprising a photopolymer formulation having the adjustable mechanical modulus GUV. A further subject matter of the invention is an illuminated, holographic medium that can be obtained by means of the method according to the invention.