| abstract |
The present invention relates to a bonded magnet composition having good injection moldability and a bonded magnet formed by molding the composition, which can avoid molding defects due to solidification of the composition before the mold cavity is completely filled. Provided. In a bonded magnet composition in which a rare earth-transition metal magnetic powder (A) is mixed and dispersed in a resin binder (B), the resin binder (B) is a polymerized fatty acid-based polyamide block copolymer (B). -1), or a polymerized fatty acid-based polyetheresteramide block copolymer (B-2), and by setting the content to 50% by weight or more, the temperature of the composition for a bonded magnet in a molten state is increased. When falling, the difference ΔT between the temperature at which the rate of increase in viscosity of the composition begins to increase (solidification start temperature: Ts) and the temperature at which the rate of increase in viscosity begins to decrease (solidification end temperature: Tf) Provided by a composition for bonded magnets characterized by being 20 ° C. or higher. [Selection] Figure 1 |