Patent ID: 8211543

Claim:
A polishing pad having a cushion layer and a polishing layer, wherein the cushion layer comprises polyurethane, chloroprene rubber, or silicone rubber, the polishing layer comprises a polymer material having a tensile elastic modulus at 50° C. after saturation swelling with water at 50° C. of 130 to 800 MPa, a loss tangent at 50° C. of 0.2 or less, and a contact angle with water of 80° or less, and when a dynamic compression viscoelasticity measurement is performed on the cushion layer under conditions of 23° C., a static load of 27.6 kPa, a frequency of 11 Hz and an amplitude of 1 μm, (1) a phase difference between dynamic stress and deformation is 4° or less, and (2) a ratio of the maximum value of the deformation amount to the maximum value of the dynamic stress ([maximum value of deformation amount]/[maximum value of dynamic stress]) is 0.5 μm/kPa or more.