Patent ID: 6342557
Filing Date: 2002-01-29
Classification: H01F

Abstract:
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 âˆ’0.040 to 0.010%/Â° C. in a temperature range of from 20Â° C. to 80Â° C. and an average particle diameter ranging from 2 to 1,000 &mgr;m, (2) the soft ferrite powder is Niâ€”Zn ferrite powder containing ZnO in an amount of 20 mol % or lower based on the composition of the soft ferrite, a CuO component in a proportion of 0.5 to 3 wt. %, and at least one additive component selected from the group consisting of SiO2, PbO, PbO2, As2O3 and V2O5 in a proportion of 5 to 15 wt. % in total, a (3) 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.