Patent ID: 6955587

Claim:
A polishing pad suitable for polishing at least one of magnetic, optical and semiconductor substrates, comprising: (a) a polishing layer having a polishing region defined by a first boundary defined by a trajectory of a first point on the polishing pad and a second boundary defined by a trajectory of a second point on the polishing pad, the second boundary being spaced from the first boundary, a first zone proximate the second boundary, a second zone between the second boundary and the first boundary, and the third zone proximate the first boundary; (b) a plurality of first large-angle grooves, each at least partially contained within the polishing region proximate the first boundary and being 45° to 135° at a point of intersection with the first boundary and in the third zone; (c) a plurality of second large-angle grooves, each at least partially contained within the polishing region proximate the second boundary and being 45° to 135° at a point of intersection with the second boundary and in the first zone; and (d) at least one small-angle groove contained within the polishing region and between the plurality of first large-angle grooves and the plurality of second large-angle grooves and being −30° to 0° or 0° to 30° with respect to the trajectory of the first boundary and the second boundary, and in the second zone.