Composition for plastic magnets

Details Composition for plastic magnets Composition for plastic magnets

1984-07-02

1985-02-05

Demers, Arthur P.

Compositions

Magnetic

With wax, bitumen, resin, or gum

4285395, 428900, H01F 1002

Patent

active

044977220

ABSTRACT:
The plastic magnet composition provided by the invention comprises a thermoplastic resin as a binder and a powder of a metallic or alloy-type magnet which is coated on the particle surface with a phosphorus-containing compound having at least one phosphorus-to-oxygen linkage in a molecule such as phosphoric acid and related compounds. By virtue of the surface coating, the magnet powder is freed from the degradation by air oxidation and the danger of ignition in the molding process so that plastic magnets of high performance can be readily manufactured with safety. The advantages of the coating layer are further increased when the coating layer is formed of a combination of the phosphorus-containing compound and an organic dye compound. An overcoating on the thus coated magnet powder with an organopolysiloxane has an effect of increased lubricity.

REFERENCES:
patent: 3859130 (1975-01-01), Parker et al.
patent: 4018968 (1977-04-01), Neumann et al.
patent: 4020236 (1977-04-01), Aonuma et al.

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