Patent ID: 7897250

Claim:
A polishing pad comprising a soft urethane foam sheet having foam cells with opened pores formed on a surface of the foam sheet, the opened pores being formed by opening the foam cells by a buffing or slicing process, wherein a percentage of said opened pores having opened pore diameters falling in a range of from between about 30 μm to 50 μm is at least 50% and the number of opened pores per 1 mm 2 on said surface falls in a range of between about 50 to 100, and at least some of said foam cells have lengths of at least about 70% of a length of the soft urethane sheet in a thickness direction thereof, and wherein an average value of a ratio of diameters of opened pores of the foam cells on the surface on which the opened pores are formed to diameters of the opened pores at a depth position of at least about 200 μm from the surface on which the opened pores are formed falls in a range of from between about 0.65 to 0.95.