Patent ID: 8357027
Filing Date: 2013-01-22
Classification: B24B,B24D

Abstract:
1. A method of manufacturing a polishing pad useful for polishing substrates in a chemical mechanical polishing process using an aqueous-based polishing composition, the method comprising the steps of: feeding polymeric capsules into a liquid polymeric matrix material, the polymeric capsules having a diameter and comprising a polymeric shell having a liquid core consisting essentially of water and incidental impurities contained within the polymeric shell and the liquid polymeric matrix material being a polyurethane prepolymer blend; mixing the polymeric capsules into the liquid polymeric matrix material to distribute the polymeric capsules within the liquid polymeric matrix material, and wherein the liquid polymeric matrix material has a first density measured before the mixing and the polymeric capsules have a second density measured before the mixing within 30 percent of the first density; curing the liquid polymeric matrix material with the polymeric capsules distributed in a cured polymeric matrix material and the diameter of the polymeric capsules expanding less than 20 percent, the polymeric shell holding the liquid core to prevent contact with the liquid polymeric matrix material during forming and to prevent foaming from, water reacting with the liquid polymer matrix material, and the polymeric shell having a polishing surface that ruptures to release the liquid core and to create surface asperities for polishing the substrates and the polymeric shell being less wear-resistant than the cured polymeric matrix material; and cutting grooves into the cured polymeric matrix material with the liquid core conducting heat to cool the polymeric matrix material and to form a polishing pad consisting essentially of polymeric capsules in the cured polyurethane matrix; and the liquid core not reacting with the aqueous-based polishing composition or altering the polishing characteristics of the aqueous-based polishing composition during polishing.