Patent ID: 7261625

Claim:
A polishing pad comprising a polyurethane-based foam in a desired shape having uniform cells, which is obtained by using a gas-dissolved raw material that comprises an inert gas dissolved under pressure in a mixture of a main raw material from which a polyurethane or a polyurea is synthesized and subsidiary raw materials and molding the gas-dissolved raw material by a reaction injection molding method, wherein the polishing pad includes a polishing region having a polishing surface suitable for polishing semi-conductor materials and having a Shore D hardness, as defined according to ASTM D2240, in the range of from 40 to 80, and a stress reduction region which is present in the side opposing to the polishing surface and which is provided with a stress adjusting portion of a desired pattern and has an amount of deflection, as applied with a load of 0.05 MPa, of 10 μm or more.