JPWO2020025482A5 - - Google Patents

Claims (14)

A magnetic assembly (x30) mounted on a transfer device (TD).
i) A soft magnetic plate (x31) composed of a composite material in which approximately 25% by weight to approximately 95% by weight of spherical soft magnetic particles are dispersed in a non-magnetic material, and the weight percentage is that of the soft magnetic plate (x31). A soft magnetic plate (x31) containing one or more voids (V) based on total weight, and
ii) With one or more dipole magnets (x32-a) disposed within the one or more voids (V) and / or facing the one or more voids (V ) .
A magnetic assembly (x30). The magnetic assembly (x30) is disposed in a holder mounted on a transfer device which is a rotating magnetic cylinder, and the soft magnetic plate (x31) has a curved surface suitable for the curved surface of the rotating magnetic cylinder. The magnetic assembly (x30) according to claim 1. The one or more dipole magnets (x32-a) each have a magnetic axis substantially perpendicular to the surface of the soft magnetic plate (x31), and the one or more dipole magnets (x32-a) ) All have the same magnetic field direction, according to claim 1 or 2. The magnetic assembly (x30). The magnetic assembly (x30) further comprises a pair or plurality of pairs of two dipole magnets (x32-b), the dipole magnet (x32-b) being disposed below the soft magnetic plate (x31). The magnetic assembly (x30) according to any one of claims 1 to 3, further separated from the one or more voids (V). Each of the pair or pair of dipole magnets (x32-b) has a magnetic axis substantially perpendicular to the surface of the soft magnetic plate (x31), and each pair of the pair or pair has the same magnetic field. The magnetic assembly (x30) of claim 4, comprising two dipole magnets (x32-b) having directions or opposite magnetic field directions. The magnetic assembly (x30) comprises one dipole magnet (x32-a) having a magnetic axis substantially parallel to the surface of the soft magnetic plate (x31), the dipole magnet (x32-a). Arranged in the one or more voids (V), or facing a pair or pairs of the one or more voids (V) and two dipole magnets (x32-b). The dipole magnet (x32-b) is arranged below the soft magnetic plate (x31) and separated from the one or more voids (V), according to claim 1 or 2. Magnetic assembly (x30). The side surface of two dipole magnets (x32-b) out of a pair or pairs of the two dipole magnets (x32-b) is flush with the outer surface of the one or more voids (V). The magnetic assembly (x30) according to any one of claims 4 to 6. The polymer matrix of the soft magnetic plate (x31) is polyamide, copolyamide, polyphthalimide, polyolefin, polyester, polytetrafluoroethylene, polyacrylate, polymethacrylate, polyimide, polyetherimide, polyether ether ketone, polyallyl ether ketone. , Polyphenylene sulphide, liquid crystal polymer, polycarbonate, and one or more thermoplastic materials selected from the group consisting of a mixture thereof, or an epoxy resin, a phenol resin, a polyimide resin, a silicon resin, and a mixture thereof. The spherical soft magnetic particles containing or consisting of one or more thermoplastic materials selected from the group are selected from the group consisting of carbonyl iron, carbonyl nickel, cobalt, and combinations thereof. The magnetic assembly (x30) according to any one of claims 1 to 7, which has a d50 of about 0.5 μm to about 100 μm. The magnetic assembly according to any one of claims 1 to 8, wherein the soft magnetic plate (x31) has a thickness of at least about 0.5 mm, preferably at least about 1 mm, more preferably about 1 mm to about 5 mm. (X30). The transfer device (TD), preferably a rotary magnetic cylinder (RMC), comprises at least one of the plurality of magnetic assemblies (x30) according to any one of claims 1-9. ), Preferably the rotating magnetic cylinder (RMC) comprising at least one of the plurality of magnetic assemblies (x30) according to any one of claims 1-9 mounted therein. .. A process for forming an optical effect layer (OEL) showing one or more signs on a substrate (x20).
a) A step of applying a coating composition containing i) platelet-like magnetic or magnetizable pigment particles and ii) binder material to the surface of the substrate (x20) in order to form a coating layer (x10) on the substrate (x20). And the step, wherein the coating composition is in the first liquid state.
b) The step of exposing the coating layer (x10) to the magnetic field of the magnetic assembly (x30) according to any one of claims 1 to 9.
c) A step of solidifying the coating composition into a second state in order to fix the platelet-like magnetic or magnetizable pigment particles in their respective selected positions and orientations.
Including the process. The platelet-like magnetic or magnetizable pigment particles consist of a group consisting of platelet-like magnetic thin film interference pigment particles, platelet-like magnetic cholesteric liquid crystal pigment particles, platelet-like interference coating pigment particles containing a magnetic material, and a mixture of two or more thereof. 11. The process of claim 11 , wherein the platelet-like optically variable magnetic or magnetizable pigment particles of choice. A step of exposing the coating layer (x10) to a dynamic magnetic field of an apparatus to biaxially orient at least a portion of the platelet-like magnetic or magnetizable pigment particles, prior to step b) or in step b). The process of claim 11 or 12, further comprising a step that occurs at the same time and before step c). A method of manufacturing security documents or decorative elements or objects.
a) Steps to prepare security documents or decorative elements or objects,
b) A step of preparing an optical effect layer according to the process according to any one of claims 11 to 13, as included in the security document or decorative element or decorative object.
Including the method.