Patent ID: 7357703
Filing Date: 2008-04-15
Classification: B24B

Abstract:
1. A chemical mechanical polishing pad comprising a polishing surface and a non-polishing surface on a side opposite the polishing surface, wherein the polishing surface comprises at least two groups of grooves: (i) a group of first grooves that intersect a single virtual straight line extending from the center toward the periphery of the polishing surface, do not intersect one another and have a land ratio represented by the following equation (1) of 6 to 30: wherein P is the distance between adjacent intersections between the virtual straight line and the first grooves, and W is the width of the first , grooves; and (ii) a group of second grooves that extend from the center portion toward the peripheral portion of the polishing surface, intersect the first grooves, consist of second grooves which are in contact with one another in the area of the center portion and second grooves which are not in contact with any other second grooves in the area of the center portion, and do not intersect one another.