Patent ID: 9017140
Filing Date: 2015-04-28
Classification: B24B

Abstract:
1. A method of fabricating a CMP polishing pad, the method comprising: providing a first assembly of a non-liquid, only partially cured thermoset polyurethane or polyurea local area transparency intermediate material having one surface affixed to a support member; positioning said first assembly in a polishing pad making apparatus wherein the affixed surface of the non-liquid, only partially cured thermoset polyurethane or polyurea local area transparency intermediate material is located between a polishing surface region and a bottom surface region of a polishing pad formation region in the polishing pad making apparatus, and wherein the support member of the first assembly is accommodated in the polishing pad making apparatus and located proximate to the polishing surface region and distal from the bottom surface region of the polishing pad formation region in the polishing pad making apparatus; introducing opaque thermoset polyurethane or polyurea intermediate material into said polishing pad making apparatus; co-curing the non-liquid, only partially cured thermoset polyurethane or polyurea thermoset local area transparency intermediate material and the opaque thermoset intermediate material to form a polishing layer having a polishing surface and a back surface opposite said polishing surface, the polishing layer comprising a local area transparency (LAT) region disposed in and covalently bonded directly to an opaque polishing region, the LAT region transparent in its entirety; and subsequent to the co-curing, removing the support member.