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Optical effect pigment

A technology for effect pigments, luminescent materials, applied in applications, fibrous fillers, inks, etc.

Active Publication Date: 2020-02-14
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, there is another aspect of the position that a prior art magnetic effect pigment will have on a printed substrate that cannot be controlled by a magnetic field, namely, which side of the pigment will fall "downwards" on the substrate and which side" face up"

Method used

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  • Optical effect pigment
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Examples

Experimental program
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Embodiment Construction

[0044] refer to Figure 9 , according to a first preferred embodiment, the effect pigment with magnetic elements comprises a first (31) layer stack and a second (32) layer stack and a magnetic layer (33), the magnetic layer (33) being located in the first ( 31) between the layer stack and the second (32) layer stack and with out-of-plane magnetization relative to the plane of the pigment.

[0045] The first layer stack (31) comprises at least one absorber layer (34a), at least one dielectric layer (35a) and at least one reflector layer (36a). The second layer stack (32) comprises at least one reflector layer (36b), at least one dielectric layer (35b) and at least one absorber layer (34b). The first layer stack (31) has a different configuration than the second layer stack (32), in that at least one of the layers (34a, 34b, 35a, 35b, 36a, 36b) is different from its counterpart, e.g. are made of different materials, or have different thicknesses or different refractive indices...

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Abstract

Optical effect pigment comprising a plurality of layers and a magnetic element. According to the invention, the layers can be arranged in two stacks of asymmetric layers (31, 32, 46, 47) or in a single stack of layers (37, 42) and can comprise at least one absorber layer and at least one dielectric layer and can further comprise a reflector layer. The magnetic element presents a magnetisation which is out-of-plane, i.e. predominantly perpendicular to the plane of the pigment, thereby allowing deposition on a printing substrate such that it can be predetermined which face of the pigment is facing up or facing down on the substrate. Such effect pigment has applications in many fields and specifically in security printing, where due to controlled deposition, for example, a double-stack pigment will produce a different optical effect on each of its faces.

Description

technical field [0001] The present invention relates to the field of effect pigments used for different purposes including security printing and the like, and in particular to effect pigments comprising a plurality of layers and magnetic elements. Background technique [0002] Effect pigments, also known under other names as "optically variable pigments" (OVP), are particles with the following basic characteristics: a) they have an elongated, scaly, plate-like or flake-like shape and thus have two surfaces ; b) its structure is composed of many layers; and c) it exhibits optical effects which mainly depend on the number, composition, thickness and refractive index of its layers. Optical effects include color-changing effects, holographic effects, and luminescent effects. Throughout this patent the name "effect pigments" or simply "pigments" will be used. [0003] Effect pigments have many industrial applications, especially in cosmetics, coatings and security printing. Pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09D11/322
CPCC09D11/107C09D11/322C09D11/324C09C1/0015C01P2006/42C01P2006/60C09C2200/1054C09C2210/50C09C2200/24
Inventor A·瑞兹·奎维多
Owner SICPA HLDG SA