Optically variable pigment and manufacturing method thereof

Abstract

The invention discloses an optically variable pigment. The optically variable pigment is characterized by comprising a first area and a second area, wherein the first area is flat area with a flat surface and the second area has a sub-wavelength micro relief structure. The invention further discloses a manufacturing method for the optically variable pigment. The method comprises the following steps: providing a substrate; arranging a compression molding layer on one surface of the substrate, wherein the compression molding layer has an area with a sub-wavelength micro relief structure and an area with a flat surface; forming a peeling layer on the compression molding layer, wherein the peeling layer has a sub-wavelength micro relief structure identical to the sub-wavelength micro relief structure of the compression molding layer; depositing at least one pigment coating on the peeling layer in sequence, wherein the pigment coating has a sub-wavelength micro relief structure identical to the sub-wavelength micro relief structure of the peeling layer; dissolving the peeling layer; crushing the pigment coating; and screening the desired optically variable pigment from the crushed pigment coating.

Description

technical field [0001] The invention relates to an optical variable pigment and a manufacturing method thereof. Background technique [0002] Optically variable pigment (OVP) is a high-end optical anti-counterfeiting product, and it is the manufacture of optically variable ink (OVI), which has the characteristic of changing color with the viewing angle. When the angle between the viewing direction and the normal line is different, such as 0° and 45°, the optically variable pigment will show two completely different colors. Moreover, unlike traditional color pigments, this optically variable pigment cannot be reproduced by common counterfeiting methods such as scanners, color reproduction equipment, electronic color separation plate making and rubbing. Optically variable pigments have a multilayer film interference structure. The production process generally involves vacuum winding evaporation equipment, and it is very difficult to maintain product consistency. The productio...

AI Technical Summary

Problems solved by technology

However, this rainbow diffraction effect is easy to superimpose and interfere with the optical change effect, which reduces the anti-counterfeiting ability of the public

Patent CN102504620A discloses a preparation method of OVP with specific properties, but this specific property can only be recognized after magnification with a microscope, without adding new optical effects, and has limited improvement in anti-counterfeiting capabilities for the general public

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