A nanoparticle sized between 10-180 nm composed of M(III).sub.2O.sub.3, M(II)O and M(II)M(III).sub.2O.sub.4, wherein M(III) is a trivalent metal and M(II) is a divalent metal, or Fe.sub.2O.sub.3, MnO and M(II)O, wherein M is a divalent metal selected from the group consisting of Fe, Ni, Co, Cu, Pt, Au, Ag, Ba and a rare earth metal.

A fluid for ink jet printing characters on a substrate that become magnetized in the presence of a magnetic field, the fluid HAVING a suspension of nanoparticles dispersed in a solvent, wherein the fluid comprises a viscosity from 1 to 50 cps and a surface tension of 20-45 dynes/cm, further wherein each nanoparticle is sized between 10-180 nm and comprises M(III).sub.2O.sub.3, M(II)O and M(II)M(III).sub.2O.sub.4, wherein M(III) is a trivalent metal and M(II) is a divalent metal, or Fe.sub.2O.sub.3, MnO and M(II)O, wherein M is a divalent metal selected from the group consisting of Fe, Ni, Mn, Co, Cu, Pt, Au, Ag, Ba and a rare earth metal.

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

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 magnetic assemblies and processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes.

The present disclosure provides a gluing device, a gluing method and a colloid for packaging devices. The gluing device includes an instillation head configured to guide a glue added with magnetic material in an instillation direction; and a magnetic field generation mechanism configured to apply a magnetic field within the instillation head, so as to apply a force to the magnetic material through the magnetic field in a direction identical to or opposite to the instillation direction. Thus a flow rate of the glue in the instillation direction is controlled through the force applied by the magnetic material to the glue. The glue in the gluing device may be smoothly dripped out at a constant flow rate, thereby to prevent the occurrence of discontinuous or thin glue lines in the related art due to an insufficient pressure during gluing.

Provided is a process for producing a coating on a substrate comprising one or more steps of crushing a dried layer of a foamed aqueous coating composition, wherein the aqueous coating composition comprises a collection of multi-stage copolymer particles having a weight average diameter of 2-20 m, wherein said multi-stage copolymer particles comprise a core having a glass transition temperature (Tg) of 20 C. or less. Also provided is a coated substrate made by that process.

Disclosed are a coating apparatus and a coating method. The coating apparatus includes a chamber, a support located in an interior space of the chamber and configured to support a substrate which is to be coated, an ejection nozzle configured to eject a coating material toward the support, and an electric field forming unit configured to form an electric field in a movement path of the coating material to provide kinetic energy for the coating material.

Magnetic field-generating device including a plurality of elements selected from magnets and pole pieces and including at least one magnet. Plurality of elements are (i) located below supporting surface or space configured to receive a substrate acting as supporting surface or (ii) forming a supporting surface, and are configured to provide a magnetic field with magnetic field lines running substantially parallel to supporting surface or space in two or more areas above supporting surface or space. Two or more areas form nested loop-shaped areas surrounding a central area; and/or the plurality of elements include a plurality of magnets, which are rotatable around an axis of rotation such that areas with field lines running substantially parallel to supporting surface or space combine upon rotation around axis of rotation, thereby forming, upon rotation around axis of rotation, a plurality of nested loop-shaped areas surrounding one central area.

Disclosure relates to the field of graphical elements and is directed to a device for producing an optical effect layer (OEL). Disclosure provides an optical effect that is easy to detect as such and exhibits a viewing-angle dependent apparent motion of image features over an extended length if the viewing angle with respect to the OEL changes. OEL includes a binder material being at least partially transparent and a plurality of particles dispersed within the layer. Each particle has a non-isotropic reflectivity and may be magnetic or magnetizable. Orientation of the particles forms an orientation pattern extending over a length within an extended surface of the OEL, such that the local average of an angle between (i) a straight line along an observed longest dimension within the corresponding cross-section shape, and (ii) said first direction x varies according to a function () of a position (P) along said first direction.

An optically variable device may be manufactured by aligning magnetic flakes on a surface of an adhesive layer by applying the flakes onto the adhesive layer surface in presence of a magnetic field, and curing the adhesive layer having magnetic flakes adhered to the adhesive layer. When cured, the adhesive layer holds the magnetic flakes oriented, enabling subsequent encapsulation of the oriented magnetic flakes in a coating layer on the adhesive layer, without a substantial loss of orientation of the magnetic flakes.