Polishing pad with projecting portion

Abstract

A polishing pad include a polishing layer having a polishing surface and a backing layer on a side of the polishing layer opposite the polishing surface. An outer edge of the polishing layer overhangs an outer edge of the backing layer.

1 . A polishing pad, comprising:
 a polishing layer having a polishing surface; and   a backing layer on a side of the polishing layer opposite the polishing surface, wherein an outer edge of the polishing layer overhangs an outer edge of the backing layer.   
     
     
         2 . The polishing pad of  claim 1 , wherein the polishing layer and backing layer are substantially circular, and wherein a diameter of the backing layer is less than a diameter of the polishing layer. 
     
     
         3 . The polishing pad of  claim 1 , wherein the backing layer is more compressible than the polishing layer. 
     
     
         4 . The polishing pad of  claim 1 , wherein the outer edge of the polishing layer overhangs the outer edge of the backing layer by about one-quarter inch. 
     
     
         5 . The polishing pad of  claim 1 , wherein the polishing layer and backing layer are secured by an adhesive. 
     
     
         6 . The polishing pad of  claim 1 , wherein the polishing layer comprises polyurethane with embedded hollow microspheres. 
     
     
         7 . The polishing pad of  claim 1 , wherein the backing layer comprises polyurethane impregnated polyester felt.