초록 ▼

Optical security articles and methods of making same are described comprising a first layer substantially transparent to visible light and having a first refractive index, the first layer having a relief pattern on a first surface thereof and a substantially smooth second surface, and an adhesive la

Optical security articles and methods of making same are described comprising a first layer substantially transparent to visible light and having a first refractive index, the first layer having a relief pattern on a first surface thereof and a substantially smooth second surface, and an adhesive layer coterminating with the first layer. The adhesive layer substantially completely fills and makes contact with a first portion of the plurality of geometric concavities, the adhesive layer having a second refractive index which is substantially similar to the first refractive index of the first layer. A second portion of the plurality of geometric concavities are precluded from contact with the adhesive layer by a corresponding plurality of separation layers, each separation layer having a separation layer refractive index which is different from the refractive index of the first layer.

대표청구항 ▼

[ What is claimed is:] [1.] A method of making an optical security article comprising the steps of:a) preparing a coatable composition comprising a curable organic resin;b) providing a production tool comprising a first plurality of geometric concavities and corresponding peaks;c) coating the coatab

[ What is claimed is:] [1.] A method of making an optical security article comprising the steps of:a) preparing a coatable composition comprising a curable organic resin;b) providing a production tool comprising a first plurality of geometric concavities and corresponding peaks;c) coating the coatable composition onto the production tool, thus substantially filling the first plurality of concavities;d) contacting a first plastic film with the coatable composition on the production tool, at least one of the production tool and the first plastic film being flexible;e) exposing the composition to conditions sufficient to cure the resin of the composition to yield a first intermediate comprising the first plastic film and a cured composition, the cured composition having a first refractive index;f) removing the first intermediate from the production tool, the first intermediate having a structured first surface and a substantially smooth second surface, the structured first surface comprising a second plurality of geometric concavities and corresponding peaks which are the reverse image of the first plurality of geometric concavities and corresponding peaks;g) providing a second plastic film having first and second surfaces;h) applying a separation material on a selected area of the first surface of the second plastic film to form a second intermediate; andi) adhering the second intermediate to the first intermediate with an adhesive layer, the adhesive layer having a second refractive index which is substantially similar to the first refractive index of the cured composition, such that the separation material is disposed between a first portion of the second plurality of geometric concavities and a first portion of the adhesive layer to form a reflective area, and wherein a second portion of the adhesive layer adhesively contacts and fills a second portion of the second plurality of concavities to form a transparent area.