Patent ID: 8865785
Filing Date: 2014-10-21
Classification: B24B,B24D,C08G

Abstract:
1. A polishing pad, comprising a polishing layer comprising a polyurethane foam having fine cells, wherein the polyurethane foam is a cured product of a reaction of (1) an isocyanate-terminated prepolymer (A) that includes an isocyanate monomer, a high molecular weight polyol (a), and a low molecular weight polyol, (2) an isocyanate-terminated prepolymer (B) that includes a polymerized diisocyanate and a polyethylene glycol with a number average molecular weight of 250-650, and (3) a chain extender, wherein the high molecular weight polyol (a) is a polyether polyol with a number average molecular weight of 1000 to 2000, and the isocyanate monomer is toluene diisocyanate or dicyclohexylmethane diisocyanate, the low molecular weight polyol has a molecular weight lower than the high molecular weight polyol (a), and the polyurethane foam has a dimensional change rate of 0.8% or less and a bending elastic modulus change rate of 40% or less when absorbing water.