Patent ID: 8431489
Filing Date: 2013-04-30
Classification: B24B,Y10T

Abstract:
1. A method for chemical mechanical polishing of a substrate selected from a magnetic substrate, an optical substrate and a semiconductor substrate; comprising: providing a chemical mechanical polishing apparatus having a platen; providing at least one substrate selected from a magnetic substrate, an optical substrate and a semiconductor substrate; selecting a chemical mechanical polishing pad having a polishing layer having a polishing surface and an integral window; wherein the integral window is a polyurethane reaction product of a curative agent and an isocyanate-terminated prepolymer polyol; wherein the curative agent is selected from the group consisting of 4,4′-methylene-bis-o-chloroaniline; 4,4′-methylene-bis-(3-chloro-2,6-diethylaniline); dimethylthiotoluenediamine; trimethyleneglycol di-p-aminobenzoate; polytetramethyleneoxide di-p-aminobenzoate; polytetramethyleneoxide mono-p-aminobenzoate; polypropyleneoxide di-p-aminobenzoate; polypropyleneoxide mono-p-aminobenzoate; 1,2-bis(2-aminophenylthio)ethane; 4,4′-methylene-bis-aniline; diethyltoluenediamine; 5-tert-butyl-2,4-toluenediamine; 3-tert-butyl-2,6-toluenediamine; 5-tert-amyl-2,4-toluenediamine; 3-tert-amyl-2,6-toluenediamine; chlorotoluenediamine and mixtures thereof; wherein the isocyanate-terminated prepolymer polyol is a reaction product of a polyol and a polyfunctional aromatic isocyanate; wherein the polyol is selected from the group consisting of polytetramethylene ether glycol, polypropylene ether glycol, an ester-based polyol, a copolymer thereof and a mixture thereof; wherein the polyfunctional aromatic isocyanate is selected from the group consisting of 2,4-toluene diisocyanate; 2,6-toluene diisocyanate; 4,4′-diphenylmethane diisocyanate; naphthalene-1,5-diisocyanate; toluidine diisocyanate; para-phenylene diisocyanate; xylylene diisocyanate; and, mixtures thereof; wherein the curative agent contains curative amine moieties that react with the unreacted NCO moieties contained in the isocyanate-terminated prepolymer polyol to form the integral window; wherein the curative agent and the isocyanate-terminated prepolymer polyol are provided at an amine moiety to unreacted NCO moiety stoichiometric ratio of 100 to 125%; wherein the integral window has a porosity of <0.1 vol %; wherein the integral window exhibits an average compression set of 5 to 25%; and, wherein the polishing surface is adapted for polishing a substrate selected from a magnetic substrate, an optical substrate and a semiconductor substrate; installing onto the platen the chemical mechanical polishing pad; and, polishing the at least one substrate with the polishing surface of the polishing layer.