Patent ID: 6974372
Filing Date: 2005-12-13
Classification: B24B,Y10S

Abstract:
1. 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 corresponding to 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 a third zone proximate the first boundary; (b) at least one first small-angle groove at least partially contained within the polishing region proximate the first boundary and forming an angle of −40° to 40° relative to the first boundary at a point proximate the first boundary and in the third zone; (c) at least one second small-angle groove at least partially contained within the polishing region proximate the second boundary and forming an angle of −40° to 40° relative to the second boundary at a point proximate the second boundary and in the first zone; and (d) a plurality of large-angle grooves, each contained within the polishing region and located between the at least one first small-angle groove and the at least one second small angle groove and each of the plurality of large-angle grooves forming an angle of 45° to 135° relative to each of the first boundary and the second boundary, and in the second zone.