Patent ID: 8148441
Filing Date: 2012-04-03
Classification: B24B,B24D,C08G

Abstract:
1. A method for manufacturing a polishing pad, comprising mixing a first component containing an isocyanate-terminated prepolymer into a second component containing a chain extender for curing to produce a polyurethane resin foam, wherein the mixing comprises adding a silicone-based surfactant into the first component in the range of 0.05 to 10 wt % based on the polyurethane resin foam, agitating the first component together with a non-reactive gas to thereby prepare a cell dispersion liquid in which the non-reactive gas is dispersed as fine cells and thereafter mixing the second component into the cell dispersion liquid for curing to thereby produce a polyurethane resin foam, wherein the chain extender is an aromatic polyamine with a melting point of 70° C. or lower, and wherein the aromatic polyamine is at least one selected from the group consisting of N,N′-di-sec-butyl-4,4′-diaminodiphenylmethane, 3,3′-diethyl-4,4′-diaminodiphenylmethane, m-xylylenediamine, N,N′-di-sec-butyl-p-phenylenediamine, m-phenylenediamine, p-xylylenediamine, and a polyalkylene oxide-di-p-aminobenzoate expressed by the following general formula (1): wherein m is 4 and n is an integer from 2 to 5.