Patent ID: 8579677

Claim:
An abrasive brush comprising: a securing element; and a plurality of abrasive filaments secured to the securing element to form a brush, each abrasive filament comprising a matrix of thermoplastic polymer and a plurality of alumina abrasive particles interspersed throughout at least a portion of the matrix, the abrasive particles comprising a polycrystalline alpha alumina having a fine crystalline microstructure characterized by an alpha alumina average domain size not greater than 500 nm, wherein the alumina abrasive particles further comprising a pinning agent, the pinning agent comprising a dispersed phase in the polycrystalline alpha alumina, wherein the polycrystalline alpha alumina is in an amount of at least 80 wt %, and wherein the pinning agent is present in the abrasive particles in an amount not less than about 0.1 wt % and not greater than 20 wt %.