Resin-bonded magnet comprising a specific type of ferromagnetic powder dispersed in a specific type of resin binder

DETAILED DESCRIPTION It is accordingly an object of the invention to provide a resin-bonded magnet which is readily manufactured with good magnetic characteristics.
It is another object of the invention to provide a resin-bonded magnet which enables one to cope with a recent tendency toward miniaturization and high performance of the magnet.
It is a further object of the invention to provide a resin-bonded magnet which comprises particles of a Fe-B-R alloy dispersed in a resin binder.
According to the present invention, there is provided a resin-bonded magnet which comprises particles of a melt-quenched ferromagnetic material of the formula, Fe-B-R, in which R represents Nd and/or Pr, and a binder resin dispersing the particles throughout the resin and fixing the particles, the binder resin comprising an oligomer having at least an alcoholic hydroxyl group and a block isocyanate with an active hydrogen-bearing compound.
Preferably, the magnet is shaped in the form of a cylinder, ring or column having an outer diameter of not larger than 25 mm and a density of not less than 5.
0 g/cm.
sup.
3.