Patent ID: 8512427

Claim:
A chemical mechanical polishing pad for polishing a substrate selected from at least one of a magnetic substrate, an optical substrate and a semiconductor substrate; comprising a polishing layer, wherein the polishing layer comprises the reaction product of ingredients, comprising: (a) an isocyanate-terminated urethane prepolymer prepared from the reaction of (i) a polyfunctional isocyanate, and (ii) a polyol; wherein the isocyanate-terminated urethane prepolymer has 4 to 12 wt % unreacted NCO groups; (b) a polyamine chain extender; (c) an acrylate selected from the group consisting of hydroxyalkyl (alkyl)acrylates and 2-aminoethyl (meth)acrylate; and, (d) a free radical initiator; wherein the polishing layer exhibits a tensile modulus of 65 to 500 MPa; an elongation to break of 50 to 250%; a storage modulus, G′, of 25 to 200 MPa; a Shore D hardness of 25 to 75; and a wet cut rate of 1 to 10 μm/min.