Patent ID: 8476328

Claim:
A polishing pad comprising a polishing layer provided on a base material layer, wherein the polishing layer comprises a thermosetting polyurethane foam containing roughly spherical interconnected cells having an aperture, the thermosetting polyurethane foam comprises an isocyanate component and an active hydrogen-containing compound as starting components, the isocyanate component contains 90% by weight or more of diphenylmethane diisocyanate and/or a modified product thereof, the active hydrogen-containing compound contains 60 to 98% by weight of polycaprolactone polyol, and 15 to 40% by weight of a compound having the number of functional groups reactive with an isocyanate group of 3, the isocyanate group concentration relative to the total amount of the isocyanate component and the active hydrogen-containing compound is 10 to 15% by weight, and the polishing layer has the absolute value of a change rate between compressibility A in a dry condition and compressibility B in a wet condition ({(B−A)/A}×100) of 100 or less, and the dry condition is defined as being held at a temperature of 23° C. and a humidity of 50% for 40 hours, and the wet condition is defined as being held in pure water at a temperature of 23° C. for 24 hours.