Patent ID: 9707663
Date: 2017-07-18
CPC Classifications: B24B,D06N

Claim:
1. A polishing pad comprising a laminate including a polishing pad base and a porous polyurethane layer, the polishing pad base comprising a nonwoven fabric impregnated with a polyurethane based elastomer, the nonwoven fabric being formed of bundles of ultrafine fibers with an average monofilament diameter of 3.0 μm or more and 8.0 μm or less and the polyurethane based elastomer being present in an amount of 20 mass % or more and 50 mass % or less relative to the mass of the polishing pad base, and the porous polyurethane layer containing polyurethane as a primary component, wherein the porous polyurethane layer has openings with an average opening diameter of 10 μm or more and 90 μm or less in its surface and the compression elastic modulus is 0.17 MPa or more and 0.32 MPa or less.