Abstract: A permanent magnet manufacturing apparatus includes a compression molding mechanism and a magnetic field generating mechanism. The compression molding mechanism includes a pair of punches facing each other, and a die having a tubular shape into which the pair of punches are inserted. The magnetic field generating mechanism includes a pair of coils. The compression molding mechanism is disposed between the pair of coils. A raw material containing magnet powder is supplied into the die. The raw material in the die is compressed by the pair of punches while a magnetic field generated by at least one of the coils is applied to the raw material. A direction of the magnetic field applied to the raw material is changed by at least one operation selected from a group consisting of a movement of an entirety of the magnetic field generating mechanism, a rotation of the entirety of the magnetic field generating mechanism, and a rotation of at least one of the coils.

Abstract: A compound for dust core includes a metal powder including iron, a resin composition, and a metal salt, in which the metal salt is represented by R2M, R represents a saturated fatty acid group having 6 or more and 12 or less carbon atoms, and M represents at least one metal element between Ca and Ba.

Abstract: A monomer composition is a monomer composition for impregnating voids in a porous compact. The compact contains a metal powder and a thermosetting resin composition. The monomer composition contains at least one compound selected from the group consisting of an acrylate having a dicyclopentane structure, an acrylate having a dicyclopentene structure, a methacrylate having a dicyclopentane structure, and a methacrylate having a dicyclopentene structure.

Abstract: A magnetic powder includes: a plurality of magnetic particles including at least either one of a permanent magnet and a soft magnetic material; a first silicon compound covering at least a portion of the surfaces of the magnetic particles; and a second silicon compound covering at least a portion of the surfaces of the magnetic particles. The first silicon compound includes an alkyl group and silicon bonded to the alkyl group. The second silicon compound includes an alkyl chain, silicon bonded to one end of the alkyl chain, and a glycidyl group located at the other end of the alkyl chain. A number m of carbon atoms of the alkyl chain included in the second silicon compound is larger than a number n of carbon atoms of the alkyl group included in the first silicon compound.

Abstract: A compound for bonded magnet that increases the mechanical strength (for example, crushing strength) of a bonded magnet is provided. The compound for bonded magnet includes a magnetic powder, an epoxy resin, a curing agent, a coupling agent, and a metal salt, and the metal salt is represented by R2M, in which R represents a saturated fatty acid group having 6 or more and 10 or less carbon atoms, while M represents at least one metal element between Ca and Ba.

Abstract: A compound for dust core includes a metal powder including iron, a resin composition, and a metal salt, in which the metal salt is represented by R2M, R represents a saturated fatty acid group having 6 or more and 12 or less carbon atoms, and M represents at least one metal element between Ca and Ba.

Abstract: Provided is a compound powder suitable for producing a molded body having a high density. A compound powder 10 includes metal element-containing particles 1 and a resin composition 2 covering the metal element-containing particle 1, in which a melt viscosity of the resin composition 2 at 100° C. is 0.01 Pa·s or more and 10 Pa·s or less.

Abstract: Improved process for producing terephthalic acid by liquid-phase catalytic oxidation of p-xylene with oxygen at a temperature of at least about 160.degree. C. and a pressure of at least about 5 kg/cm.sup.2 G under specific recycling condition of the mother liquor, which comprises(A) performing said liquid-phase catalytic oxidation at a temperature (T) within the range of about 170.degree. C. to about 230.degree. C. to form an oxidation reaction mixture containing crude terephthalic acid having a 4-carboxybenzaldehyde content of 500 to 3,000 ppm and an optical density, measured at 340 m.mu., of not more than 0.3,(B) separating about 60 to about 98% by weight of the total mother liquor from the resulting oxidation reaction mixture at a temperaure of from (T-30).degree. C. to (T+10).degree. C.

Abstract: A high voltage generating device utilizing a piezoelectric transformer in which an inductance is connected between one of the drive electrodes of the piezoelectric transformer and an output terminal of a drive signal source, and a capacitor is connected across the two drive electrodes so that a variation of the output voltage of the device due to a change in the load is minimized. In addition, the effective range of the frequency characteristic of the output voltage is expanded and the temperature characteristic of the output voltage is improved.