Patent ID: 8303372
Filing Date: 2012-11-06
Classification: B24B,B24D,C08G,C08J,C08L

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 an isocyanate-terminated prepolymer (A) that is capable of reacting with 4,4′-methylenebis(o-chloroaniline) to form a non-foamed polyurethane having a tan δ peak temperature of 100° C. or more, an isocyanate-terminated prepolymer (B) that is capable of reacting with 4,4′-methylenebis(o-chloroaniline) to form a non-foamed polyurethane having a tan δ peak temperature of 40° C. or less, and 4,4′-methylenebis(o-chloroaniline), and the isocyanate-terminated prepolymers (A) and (B) are mixed in an (A)/(B) ratio of 50/50 to 90/10 (by wt %), and wherein the isocyanate-terminated prepolymer (A) comprises isocyanate component units derived from an aromatic diisocyanate and an alicyclic diisocyanate as raw materials, and the isocyanate-terminated prepolymer (B) comprises an isocyanate component unit derived from an aromatic diisocyanate as a raw material.