Patent ID: 8308531

Claim:
A polishing pad, comprising a non-woven fabric consisting of ultrafine fibers and elastomeric polymer impregnated into the fabric, on which the ultrafine fibers are raised and arranged to simultaneously satisfy the following conditions (I) to (III) such that the ultrafine fibers are oriented in a longitudinal direction to a central axis: ( f 1 +f 2 )≧( f 1 +f 2 +f 3 +f 4 )/2 (I) f 2 >f 3 >f 4 (II) f 2 >f 1 (III) wherein, f 1 is total number of ultrafine fibers arranged at an orientation angle θ 2 of 0 to less than 5° on a surface of the polishing pad, which has a certain unit area; f 2 is total number of ultrafine fibers arranged at an orientation angle θ 2 of 5 to less than 30° on a surface of the polishing pad, which has a certain unit area; f 3 is total number of ultrafine fibers arranged at an orientation angle θ 2 of 30 to less than 45° on a surface of the polishing pad, which has a certain unit area; and f 4 is total number of ultrafine fibers arranged at an orientation angle θ 2 of 45 to 90° on a surface of the polishing pad, which has a certain unit area.