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Devices and methods for orienting platelet-shaped magnetic or magnetizable pigment particles

A technology of pigment particles and flakes, which is applied in the field of optical effect layers, can solve the problems of lack of freedom to enhance angles and inapplicability, and achieve the effect of enhancing versatility and freedom

Active Publication Date: 2017-08-01
SICPA HLDG SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The methods disclosed in US 7,258,900 and US 8,137,762 all have the inconvenience that the magnetic field generated by the described arrangement of permanent magnets is only approximately parallel to the substrate surface over a restricted area, so that these methods do not Suitable for wide sheets in industrial printing methods
Furthermore, they lack the degree of freedom for selecting the lifting angle between the substrate surface and the plane of alignment of the magnetic pigment flakes; in other words, only a 0° angle between the substrate and the plane of the magnetic pigment flakes can be performed

Method used

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  • Devices and methods for orienting platelet-shaped magnetic or magnetizable pigment particles
  • Devices and methods for orienting platelet-shaped magnetic or magnetizable pigment particles
  • Devices and methods for orienting platelet-shaped magnetic or magnetizable pigment particles

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[0060] definition

[0061] The following definitions set forth the meaning of terms used in the specification and claims.

[0062] As used herein, an unqualified number may be one or more, and the unqualified noun is not necessarily limited to a singular.

[0063] As used herein, the term "about" means that the amount, value or limit referred to can be the specific value specified or some other value in the vicinity. Generally, the term "about" indicating a certain value is intended to mean a range within ±5% of that value. For example, the phrase "about 100" means a range of 100 ± 5, ie, a range of 95 to 105. Generally, when the term "about" is used, it is expected that a similar result or effect according to the present invention will be obtained within ±5% of the indicated value. However, a specific amount, value or limit supplemented by the term "about" is also intended herein to disclose that amount, value or limit itself, ie without modification by "about".

[0064...

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Abstract

The present invention relates to the field of devices and processes for producing optical effect layers (OEL) comprising magnetically bi-axially oriented platelet-shaped magnetic or magnetizable pigment particles, in particular for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes. The process described herein comprises the step of a) applying on a substrate surface a radiation curable coating composition comprising platelet-shaped magnetic or magnetizable pigment particles, b) exposing the radiation curable coating composition to a dynamic magnetic field of a magnetic assembly comprising a Halbach cylinder assembly, and c) at least partially curing the radiation curable coating composition of step b) so as to fix the platelet-shaped magnetic or magnetizable pigment particles in their adopted positions and orientations, said step c) being carried out partially simultaneously or simultaneously with step b).

Description

technical field [0001] The present invention relates to the field of methods for producing optical effect layers (OELs) comprising magnetically biaxially oriented platelet-shaped magnetic or magnetisable pigment particles. In particular, the present invention provides devices and methods for producing said OELs as anti-counterfeiting means on security documents or security articles or for decorative purposes. Background technique [0002] It is known in the art to use inks, coating compositions, coatings or layers comprising magnetic or magnetisable pigment particles, in particular optically variable platelet-shaped magnetic or magnetisable pigment particles, to manufacture security elements and security documents. [0003] Security features eg for security documents can generally be classified into "covert" security features and "overt" security features. The protection afforded by covert security features relies on the concept of such feature concealment typically requiri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/06H01F13/00
CPCB05D5/06H01F13/003B05D3/207B05D5/065H01F7/021H01F7/0294B42D25/41B42D25/378B05D3/067H01F7/0247B42D25/369H01F7/0278B42D25/29H01F1/0306H01F41/16H01F41/24
Inventor E·米勒
Owner SICPA HLDG SA
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