Patent ID: 9586304
Date: 2017-03-07
CPC Classifications: B24B,C08G,C08J,C08K,C08L,C09G,H01L

Claim:
1. A method of manufacturing a polishing pad suitable for planarizing at least one of semiconductor, optical and magnetic substrates, the method comprising the following: obtaining a liquid polyurethane material formed from an isocyanate-terminated molecule and a curative agent, the liquid polyurethane material having a T casting the liquid polyurethane material containing the blend of preexpanded and unexpanded fluid-filled polymeric microspheres to react the isocyanate-terminated molecule and the curative agent; heating the blend of preexpanded and unexpanded fluid-filled polymeric microspheres in the liquid polyurethane material to a temperature of at least T curing the blend of preexpanded and expanded fluid-filled polymeric microspheres in the liquid polyurethane material to solidify the liquid polyurethane material into a polyurethane matrix containing the preexpanded and expanded fluid-filled polymeric microspheres; and finishing the polishing pad from the cured polyurethane matrix containing the preexpanded and expanded fluid-filled polymeric microspheres wherein final diameter of the preexpanded and expanded fluid-filled polymeric microspheres is less than that achieved from the T