US 2019/0160850 A1Published application

Apparatuses and processes for producing optical effect layers comprising oriented non-spherical magnetic or magnetizable pigment particles

AssigneeSicpa Holding SA

InventorsEvgeny LOGINOV, Mathieu SCHMID, Claude-Alain DESPLAND

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Abstract

The present invention relates to the field of magnetic assemblies and processes for producing optical effect layers (OEL) comprising magnetically oriented non-spherical magnetic or magnetizable pigment particles on a substrate. In particular, the present invention relates to magnetic assemblies and processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes.

Claims14

Dependent claims

A process for producing an optical effect layer on a substrate, said process comprising the steps of:

i) applying on a substrate surface a radiation curable coating composition comprising non-spherical magnetic or magnetizable pigment particles, said radiation curable coating composition being in a first state;
ii) exposing the radiation curable coating composition to a magnetic field of a magnetic assembly comprising:
a loop-shaped magnetic-field generating device being either a single loop-shaped magnet or a combination of two or more dipole magnets disposed in a loop-shaped arrangement, the loop-shaped magnetic-field generating device having a radial magnetization;
and
a single dipole magnet having a magnetic axis substantially perpendicular to the substrate surface or two or more dipole magnets, each of said two or more dipole magnets having a magnetic axis substantially perpendicular to the substrate surface,
wherein the single dipole magnets or the two or more dipole magnets are located partially within, within or on top of the loop defined by the single loop-shaped magnet or partially within, within or on top of the loop defined by the two or more dipole magnets disposed in the loop-shaped arrangement, and
wherein the South pole of said single dipole magnet or the South pole of each of said two or more dipole magnets is pointing towards the substrate surface when the North pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device or the North pole of said single dipole magnet or the North pole of each said two or more dipole magnets is pointing towards the substrate surface when the South pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device,
so as to orient at least a part of the non-spherical magnetic or magnetizable pigment particles;
and
iii) at least partially curing the radiation curable coating composition of step ii) to a second state so as to fix the non-spherical magnetic or magnetizable pigment particles in their adopted positions and orientations,
wherein the optical effect layer provides an optical impression of one or more loop-shaped bodies having a shape that varies upon tilting the optical effect layer.

8 more elements

A magnetic assembly for producing an optical effect layer (OEL) on a substrate, said OEL providing an optical impression of one or more loop-shaped bodies having a shape that varies upon tilting the optical effect layer and comprising oriented non-spherical magnetic or magnetizable pigment particles in a cured radiation curable coating composition, wherein said magnetic assembly comprises:

a loop-shaped magnetic-field generating device being either a single loop-shaped magnet or a combination of two or more dipole magnets disposed in a loop-shaped arrangement, the loop-shaped magnetic-field generating device having a radial magnetization, and
a single dipole magnet having a magnetic axis substantially perpendicular to the substrate surface or two or more dipole magnets, each of said two or more dipole magnets having a magnetic axis substantially perpendicular to the substrate surface,
wherein the single dipole magnet or the two or more dipole magnets are located partially within, within or on top of the loop defined by the single loop-shaped magnet or within the loop defined by the two or more dipole magnets disposed in the loop-shaped arrangement, and
wherein the South pole of said single dipole magnet or the South pole of each of said two or more dipole magnets is pointing towards the substrate surface when the North pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device or the North pole of said single dipole magnet or the North pole of each of said two or more dipole magnets is pointing towards the substrate surface when the South pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device.

1 more element

Dependencies are inferred from the claim text.

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Abstract

A process for producing an optical effect layer on a substrate, said process comprising the steps of:

i) applying on a substrate surface a radiation curable coating composition comprising non-spherical magnetic or magnetizable pigment particles, said radiation curable coating composition being in a first state;
ii) exposing the radiation curable coating composition to a magnetic field of a magnetic assembly comprising:
a loop-shaped magnetic-field generating device being either a single loop-shaped magnet or a combination of two or more dipole magnets disposed in a loop-shaped arrangement, the loop-shaped magnetic-field generating device having a radial magnetization;
and
a single dipole magnet having a magnetic axis substantially perpendicular to the substrate surface or two or more dipole magnets, each of said two or more dipole magnets having a magnetic axis substantially perpendicular to the substrate surface,
wherein the single dipole magnets or the two or more dipole magnets are located partially within, within or on top of the loop defined by the single loop-shaped magnet or partially within, within or on top of the loop defined by the two or more dipole magnets disposed in the loop-shaped arrangement, and
wherein the South pole of said single dipole magnet or the South pole of each of said two or more dipole magnets is pointing towards the substrate surface when the North pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device or the North pole of said single dipole magnet or the North pole of each said two or more dipole magnets is pointing towards the substrate surface when the South pole of the single loop-shaped magnet or of the two or more dipole magnets forming the loop-shaped magnetic-field generating device is pointing towards the periphery of said loop-shaped magnetic-field generating device,
so as to orient at least a part of the non-spherical magnetic or magnetizable pigment particles;
and
iii) at least partially curing the radiation curable coating composition of step ii) to a second state so as to fix the non-spherical magnetic or magnetizable pigment particles in their adopted positions and orientations,
wherein the optical effect layer provides an optical impression of one or more loop-shaped bodies having a shape that varies upon tilting the optical effect layer.

8 more elements