RESIN-BONDED MAGNET

摘要

A resin-bonded magnet prepared by molding a composition comprising a magnetic powder and a resin binder, characterized in that the resin binder contains at least one cured unsaturated polyester resin as a main component. It is preferred that the resin binder contains a peroxide or a reaction product thereof capable of initiating curing reaction at a temperature of 150 DEG C or lower, that the magnetic powder has an anisotropy magnetic field of 50 k Oe or more, and that 50 wt.% or more of the particles of the magnetic powder have a particle diameter of 100 mu m or less. The resin-bonded magnet is prepared by a molding using an injection molding method, an injection compression molding method, an injection press molding method or a transfer molding method. The resin-bonded magnet not only has extremely excellent magnetic properties, but also is excellent in the degree of freedom for its shape, moldability and mechanical properties.