Method for transferring surface textures, such as interference layers, holograms and other highly refractive optical microstructures

A method for transferring a surface texture comprising a highly refractive optical microstructure to a substrate having a glass surface, a ceramic surface, or a metal surface, the method comprising the following process steps:

• applying a stamping sol to a self-supporting printable sheet and giving the surface texture to the stamping sol;
• and said stamping sol is an organically modified inorganic polycondensate or precursors thereof;
• thereby
• giving the self-supporting printable sheet the surface texture;
• making a stack on the substrate, the stack comprising an inorganic bonding agent coating and the surface texture, the bonding agent and the optical microstructure having a difference in refractive index, wherein the bonding agent coating is applied directly to the surface texture and the stack is then transferred to the substrate;
• and
• thermally treating the stack on the substrate, wherein as transfer of the optical microstructure to the substrate takes place, the substrate has a temperature treatment comprising the steps of heating the substrate for 8 hours at 80° C. and within 4 hours raising the temperature to 450° C.;
• holding the temperature at 450° C. for 1 hour, then cooling workpiece within 4 hours to 20° C.;
• wherein the bonding agent coating comprises a nanocomposite which can be obtained by modifying a surface of
• a) colloidal inorganic particles with
• b) at least one silane of the general formula
• Rx—Si-A4-x
• where the radical A represents a hydroxyl group or a group that can be removed hydrolytically, except methoxy, where the radical R represents a group that cannot be removed hydrolytically and x has the value 0, 1, 2 or 3, with x≧1 in at least 50 mol % of the at least one silane;
• under conditions of a sol-gel process with an under-stoichiometric amount of water, based on the radical A, with formation of a nanocomposite sol, and further hydrolysis and condensation of the nanocomposite sol.

A method for transferring a surface texture comprising a highly refractive optical microstructure to a substrate having a glass surface, a ceramic surface, or a metal surface, the method comprising the following process steps:

• a) applying a flexible covercoat onto a carrier sheet as a release coating;
• b) applying a stamping sol to the flexible covercoat and giving the surface texture to the stamping sol;
• and said stamping sol is an organically modified inorganic polycondensate or precursors thereof;
• c) making a stack on the substrate, the stack comprising an inorganic bonding agent coating and the surface texture, the bonding agent and the optical microstructure having a difference in refractive index, wherein the bonding agent coating is applied onto the substrate and dried, and the surface texture is then transferred to the bonding agent coating;
• d) removing the carrier sheet;
• and
• e) thermally treating the stack on the substrate without the carrier sheet, wherein as transfer of the optical microstructure to the substrate takes place, the substrate has a temperature treatment comprising the steps of heating the substrate for 8 hours at 80° C. and within 4 hours raising the temperature to 450° C.;
• holding the temperature at 450° C. for 1 hour, then cooling workpiece within 4 hours to 20° C.;
• wherein the bonding agent coating comprises a nanocomposite which can be obtained by modifying a surface of
• a) colloidal inorganic particles with
• b) at least one silane of the general formula
• Rx—Si-A4-x
• where the radical A represents a hydroxyl group or a group that can be removed hydrolytically, except methoxy, where the radical R represents a group that cannot be removed hydrolytically and x has the value 0, 1, 2 or 3, with x≧1 in at least 50 mol % of the at least one silane;
• under conditions of a sol-gel process with an under-stoichiometric amount of water, based on the radical A, with formation of a nanocomposite sol, and further hydrolysis and condensation of the nanocomposite sol.

A method for transferring a surface texture comprising a highly refractive optical microstructure to a substrate having a glass surface, a ceramic surface, or a metal surface, the method comprising the following process steps:

• applying a stamping sol to a self-supporting printable sheet and giving the surface texture to the stamping sol;
• and said stamping sol is an organically modified polycondensate or precursor thereof;
• thereby
• giving the self-supporting printable sheet the surface texture;
• making a stack on the substrate, the stack comprising an inorganic bonding agent coating and the surface texture, the bonding agent and the optical microstructure having a difference in refractive index, wherein the bonding agent coating is applied onto the substrate and dried, and the surface texture is then transferred to the bonding agent coating;
• and
• thermally treating the stack on the substrate, wherein as transfer of the optical microstructure to the substrate takes place, the substrate has a temperature treatment comprising the steps of heating the substrate for 8 hours at 80° C. and within 4 hours raising the temperature to 450° C.;
• holding the temperature at 450° C. for 1 hour, then cooling workpiece within 4 hours to 20° C.;
• wherein the bonding agent coating comprises a nanocomposite which can be obtained by modifying a surface of
• a) colloidal inorganic particles with
• b) at least one silane of the general formula
• Rx—Si-A4-x
• where the radical A represents a hydroxyl group or a group that can be removed hydrolytically, except methoxy, where the radical R represents a group that cannot be removed hydrolytically and x has the value 0, 1, 2 or 3, with x≧1 in at least 50 mol % of the at least one silane;
• under conditions of a sol-gel process with an under-stoichiometric amount of water, based on the radical A, with formation of a nanocomposite sol, and further hydrolysis and condensation of the nanocomposite sol.