Patent ID: 7445847
Filing Date: 2008-11-04
Classification: B24B,B24D,Y10T

Abstract:
1. A polishing pad suitable for planarizing at least one of semiconductor, optical and magnetic substrates, the polishing pad comprising a polymeric matrix, the polymeric matrix having a top polishing surface, the top polishing surface having polymeric polishing asperities or forming polymeric polishing asperities upon conditioning with an abrasive, the polymeric polishing asperities extending from the polymeric matrix and being a portion of the top polishing surface that can contact a substrate, the polishing pad forming additional polymeric polishing asperities from the polymeric matrix with wear or conditioning of the top polishing surface, and the polymeric polishing asperities being from a polymeric material having at least 45 weight percent hard segment and a bulk ultimate tensile strength of at least 6,500 psi (44.8 MPa) and the polymeric matrix having a two phase structure, a hard phase and a soft phase, the two phase structure having an average area of the hard phase to average area of the soft phase ratio of less than 1.6.