Resinous magnetic composition and manufacturing process

摘要

A resin composition comprising a synthetic resin and a powdered magnetic material, wherein (1) the powdered magnetic material is soft ferrite powder having a rate of permeability change by temperature ranging from -0.040 to 0.010%/ DEG C in a temperature range of from 20 DEG C to 80 DEG C and an average particle diameter ranging from 2 to 1,000 mu m, and (2) the powdered magnetic material is contained in a proportion of 50 to 1,400 parts by weight per 100 parts by weight of the synthetic resin, and a molded or formed product which is formed from the resin composition and exhibits a permeability stable to changes in environmental temperature.