Patent ID: 7628829

Claim:
An abrasive article comprising: a porous abrasive member comprising: an abrasive layer proximate and affixed to a first surface of a substrate, the abrasive layer comprising a plurality of abrasive particles affixed to the first surface of the substrate by at least one binder, wherein the abrasive layer has an outer abrasive surface, wherein the substrate has a thickness and a second surface opposite the first surface of the substrate, wherein a plurality of openings extend from the outer abrasive surface to the second surface of the substrate, and wherein the porous abrasive member has perforations that extend through the thickness of the substrate and have a substantially uniform cross-section throughout their length; a unitary nonwoven filter medium having a first surface and a second surface opposite the first surface, wherein the first surface of the nonwoven filter medium is proximate and affixed to the second surface of the substrate, and wherein the nonwoven filter medium comprises a plurality of synthetic fibers selected from the group consisting of polypropylene fibers, polyester fibers, nylon fibers, and mixtures thereof, and wherein the first surface of the nonwoven filter medium and the second surface of the substrate are held together by a pressure sensitive adhesive that contacts the first surface of the nonwoven filter medium and the second surface of the substrate; and a porous attachment fabric proximate and affixed to the second surface of the nonwoven filter medium, wherein the porous attachment fabric comprises a woven or knitted loop material having loop-forming filaments or yarns included in the fabric structure to form upstanding loops for engaging hooks, and wherein the second surface of the nonwoven filter medium and the porous attachment fabric are held together by a pressure sensitive adhesive that contacts the second surface of the nonwoven filter medium and the porous attachment fabric; wherein the plurality of openings cooperate with the nonwoven filter medium to allow the flow of particles from the outer abrasive surface to the porous attachment fabric, and wherein, in an unused state, die at least a portion of the abrasive article exhibits a pressure drop according to the Pressure Drop Measurement Test in a range of from 0.2 to 20 millimeters of water.