The present invention provides a magnetic multilayer pigment flake and a magnetic coating composition that are relatively safe for human health and the environment. The pigment flake includes one or more magnetic layers of a magnetic alloy and one or more dielectric layers of a dielectric material. The magnetic alloy is an iron-chromium alloy or an iron-chromium-aluminum alloy, having a substantially nickel-free composition. The coating composition includes a plurality of the pigment flakes disposed in a binder medium.

The present invention provides a magnetic multilayer pigment flake and a magnetic coating composition that are relatively safe for human health and the environment. The pigment flake includes one or more magnetic layers of a magnetic alloy and one or more dielectric layers of a dielectric material. The magnetic alloy is an iron-chromium alloy or an iron-chromium-aluminum alloy, having a substantially nickel-free composition. The coating composition includes a plurality of the pigment flakes disposed in a binder medium.

Provided is an electromagnetic wave suppression sheet that contains from 400 to 600 parts by weight of a metal magnetic powder having an oxidized coating film formed on a surface thereof, from 1 to 15 parts by weight of a chelating agent, and from 1 to 10 parts by weight of an anti-aging agent, per 100 parts by weight of chlorinated polyethylene.

A field magnet manufacturing method where a bonded magnet's inner surface press-fitted in a yoke has a certain accuracy irrespective of the accuracy of the yoke's outer circumferential surface. A cylindrical bonded magnet from binding magnet particles with a thermosetting resin is fixed in a tubular yoke of magnetic material. The method includes reheating and softening the bonded magnet after thermal curing; and press-fitting in the bonded magnet after the softening step from a tapered portion on one end side of the yoke to press the bonded magnet's outer circumferential surface against the yoke's inner surface. The press-fitting includes feeding the bonded magnet relatively into the yoke while allowing a relative posture variation between the bonded magnet and the yoke so the bonded magnet's inner surface to be remolded into a shape along the inner surface of the yoke exhibits almost the same accuracy as the yoke's inner surface.

A field magnet manufacturing method where a bonded magnet's inner surface press-fitted in a yoke has a certain accuracy irrespective of the accuracy of the yoke's outer circumferential surface. A cylindrical bonded magnet from binding magnet particles with a thermosetting resin is fixed in a tubular yoke of magnetic material. The method includes reheating and softening the bonded magnet after thermal curing; and press-fitting in the bonded magnet after the softening step from a tapered portion on one end side of the yoke to press the bonded magnet's outer circumferential surface against the yoke's inner surface. The press-fitting includes feeding the bonded magnet relatively into the yoke while allowing a relative posture variation between the bonded magnet and the yoke so the bonded magnet's inner surface to be remolded into a shape along the inner surface of the yoke exhibits almost the same accuracy as the yoke's inner surface.

The present disclosure provides an isolation sheet comprising a resin layer and a plurality of dispersed insulated soft magnetic particles in the resin layer. By adjusting the weight percentage of the insulated soft magnetic particles in the isolation sheet, the product of the imaginary part of the dielectric constant, the dielectric quality factor, the real part of the permeability and the magnetic quality factor of the isolation sheet falls between 3000 and 4500. The present disclosure also provides a method for producing the aforementioned isolation sheet to produce a flexible rolled isolation material for printing and bonding with the antenna of the UHF RFID tag with conveniences, thus it is highly practical. The present disclosure also provides a UHF RFID tag comprising the aforementioned isolation sheet.

A complex magnetic composition 10 includes a binder 14 including a bisphenol type epoxy resin with restricted molecular rotation and magnetic particles 12 bound together by the binder 14.

A complex magnetic composition 10 includes a binder 14 including a bisphenol type epoxy resin with restricted molecular rotation and magnetic particles 12 bound together by the binder 14.

Provided herein are methods and compositions comprising a non-toxic ferromagnetic ink composition. Also provided herein are plastic objects containing a surface coating of a food-safe ferromagnetic ink composition. The coating imparts functionality to a plastic object such that the object is capable of being mechanically separated from waste stream using a commercial magnetic separator. The food-safe ink composition, which can be printed using high-speed flexographic, intaglio, offset printing or pad printing, combined with heat transfer printing or hot foil stamping consists of an ingestible magnetically susceptible pigment capable of rendering the printed template with magnetically active properties. The surface of the plastic object described can consist of geometric designs which increase printable surface area without significant changes in dimensions of the said object.

Provided is a composite magnetic material in which low electrical conductivity and high magnetic permeability are achieved, and in which a frequency band in which decoupling is caused encompasses higher frequencies. The composite magnetic material comprises a flat soft magnetic metal powder; insulating particles which are smaller than an average thickness of the soft magnetic metal powder and which are disposed on a surface of the soft magnetic metal powder; and an organic binder material which retains the soft magnetic metal powder and the insulating particles in a dispersed manner. In a cross section in a thickness direction of the soft magnetic metal powder, there is at least one insulating particle per a length of 0.2 μm of the soft magnetic metal powder surface.