Patent ID: 8871331

Claim:
A coated abrasive article comprising: a backing having a surface, the surface having a shape defined by an outer contour, wherein a bisecting axis divides the shape into first and second portions; a plurality of abrasive regions directly contacting the surface in each of the first and second portions, each abrasive region including a binder and a plurality of abrasive grains in contact with the binder, the abrasive grains having an average grain size of not greater than about 200 microns; at least one macro-channel defining a passageway extending between a pair of adjacent abrasive regions and terminating at openings at the outer contour within each of the first and second portions, the macro-channel having an average channel width of between about 0.1 millimeters to about 5 millimeters and being substantially free of the binder and the abrasive grains; wherein the at least one macro-channel defines a pattern including a plurality of concentric polygons comprising at least a first polygon within a second polygon, the plurality of polygons having the same shape, and each of the plurality of polygons being rotated by an angle with respect to one another, wherein the angle is not equal to a multiple of the symmetry angle of the polygons, and wherein a vertex of the first polygon contacts an edge of the second polygon.