ABRASIVE-FILLED THERMOSET COMPOSITION AND ITS PREPARATION, AND ABRASIVE-FILLED ARTICLES AND THEIR PREPARATION (.BACKGROUND OF THE INVENTION [0001] Abrasive-filled resins are known and employed in the fabrication of abrasive tools sucli as cutting and grinding wheels. Grinding wheels containing superabrasive materials (e.g., diamond or cubic boron nitride, CBN) in the edge or oiner periphery of fi circular grinding wheel or grinding cup also are well-known in the fields of sawing, drilling, dressing, grinding, lapping-, polishing, and other abrading applications. For these applications, the grit typically is surrounded in a matrix of a metal, Such as Ni, Cu, Fe, Co, Sn, W, Ti, or an alloy thereof, or in a resin, such as phenol forrfialdehyde or other thermosetting polymeric material. By attaching the matrices to a b