Patent ID: 9108290
Filing Date: 2015-08-18
Classification: B24B,B32B

Abstract:
1. A multilayer chemical mechanical polishing pad for polishing a substrate selected from at least one of a magnetic substrate, an optical substrate and a semiconductor substrate; comprising: a polishing layer having a polishing surface, a counterbore opening, an outer perimeter, a polishing layer interfacial region parallel to the polishing surface and an average non-interfacial region thickness, T a porous subpad layer having a bottom surface, an outer perimeter and a porous subpad layer interfacial region parallel to the bottom surface; a pressure sensitive adhesive layer; and, a broad spectrum, endpoint detection window block; wherein the polishing layer interfacial region and the porous subpad layer interfacial region form a coextensive region; wherein the coextensive region secures the polishing layer to the porous subpad layer without the use of a laminating adhesive; wherein the pressure sensitive adhesive layer is applied to the bottom surface of the porous subpad layer; wherein the multilayer chemical mechanical polishing pad has a through opening that extends from the polishing surface to the bottom surface of the porous subpad layer; wherein the counterbore opening opens on the polishing surface, enlarges the through opening and forms a ledge; wherein the counterbore opening has an average depth, D wherein the average depth, D wherein the broad spectrum, endpoint detection window block is disposed within the counterbore opening; wherein the broad spectrum, endpoint detection window block is bonded to the polishing layer; and, wherein the polishing surface is adapted for polishing the substrate.