Patent ID: 7348374

Claim:
A powder coating composition comprising one or more than one curable or thermoplastic resin or polymer and one or more than one finely divided magnetic material having a Curie temperature (T C ) of from 50° C. to 250° C., wherein the said one or more than one finely divided magnetic material is chosen from Ni 1−x Zn x Fe 2 O 4 compounds, wherein 0.4<X<0.75, ferrimagnetic δFeOOH, Cu 2 MnIn, soft ferrites, Fe—Ni—B, transparent polymer-Cobalt oxide nanocomposites, mixtures thereof; ferromagnetic metals, ferromagnetic alloys, ferromagnetic compounds, ferrimagnetic compounds, and paramagnetic Ni-rich austenite, wherein the ferromagnetic compounds are chosen from Ni 1−x Zn x Fe 2 O 4 , MnO—Fe 2 O 3 , Ni—Zn—Fe 2 O 3 and Ni—Zn alloys having a T C of less than 250° C.; densified and heat treated ferromagnetic compounds, vitrified compounds from ferromagnetic metals and multilayer particles, and further wherein, when the said one or more than one finely divided magnetic material is chosen from ferromagnetic metals, ferromagnetic alloys, and ferromagnetic compounds, the said composition comprises the said ferromagnetic metals, ferromagnetic alloys, ferromagnetic compounds in the amount of from 0.1 parts per hundred parts resin (phr) to 10 phr.