Patent ID: 7371160
Filing Date: 2008-05-13
Classification: B24B

Abstract:
1. A chemical mechanical polishing pad suitable for polishing at least one of semiconductor, optical and magnetic substrates, the polishing pad comprising a polymeric matrix with an elastomeric polymer distributed within the polymeric matrix, the polymeric matrix having a glass transition above room temperature, the polymeric matrix including a polymer derived from difunctional or polyfunctional isocyanates and the polymeric matrix includes at least one selected from polyetherureas, polyisocyanurates, polyurethanes, polyureas, polyurethaneureas, copolymers thereof and mixtures thereof and the elastomeric polymer having a glass transition temperature below room temperature and an average length of at least 0.1 μm in at least one direction, the elastomeric polymer representing 1 to 45 volume percent of polishing pad and the elastic polymer having a glass transition temperature below room temperature, and the polishing pad having an increased diamond conditioner cut rate in comparison to a polishing pad formed from the polymeric matrix without the elastomeric polymer and the cut rate being measured in accordance with ASTM 11044-05 modified to measure weight loss.