Patent ID: 8530535
Filing Date: 2013-09-10
Classification: B24B,B24D,C08G,C08J

Abstract:
1. A process for manufacturing a polishing pad comprising: adding a silicone-based nonionic surfactant having no hydroxy group to a first component comprising an isocyanate-terminal prepolymer so that an amount of the surfactant becomes 10 to 20% by weight in a polyurethane resin foam, the isocyanate-terminal prepolymer being made from at least a hydrophobic high-molecular-weight polyol having a number average molecular weight of 500 to 850; stirring the first component with a non-reactive gas to prepare a bubble dispersion liquid in which the non-reactive gas is dispersed as a fine bubble; mixing a second component comprising a chain extender in the bubble dispersion liquid; and curing the mixture to prepare a polyurethane resin foam.