Patent ID: 9238296
Filing Date: 2016-01-19
CPC Classification: B24B,B24D,C08G

Claim Text:
1. A multilayer chemical mechanical polishing pad stack, comprising: a polishing layer having a polishing surface, a base surface and an average thickness, T wherein the polishing layer exhibits a density of greater than 0.6 g/cm 3 ; a Shore D hardness of 5 to 40; an elongation at break of 100 to 450%; and a cut rate of 25 to 150 μm/hr; and wherein the polishing layer has a polishing surface adapted for polishing a substrate; a rigid layer having a top surface and a bottom surface; a hot melt adhesive interposed between the polishing layer and the top surface of the rigid layer; wherein the hot melt adhesive bonds the polishing layer to the rigid layer; a pressure sensitive platen adhesive layer having a stack side and a platen side; wherein the stack side of the pressure sensitive platen adhesive layer is adjacent to the bottom surface of the rigid layer; and optionally, a release liner; wherein the optional release liner is disposed on the platen side of the pressure sensitive platen adhesive layer.