Patent ID: 10465097

Abstract:
The present invention provides chemical mechanical (CMP) polishing pads for polishing a substrate chosen from a semiconductor substrate comprising the CMP polishing pad and having one or more endpoint detection windows which is the cured product of a reaction mixture of a linear cycloaliphatic urethane macromonomer having two (meth)acrylate endgroups bound via cycloaliphatic dicarbamate esters to a polyether, polycarbonate or polyester chain having an average molecular weight of from 450 to 2,000, or an cycloaliphatic urethane oligomer thereof, and an aliphatic initiator, wherein the total isocyanate content in the urethane macromonomer ranges from 3.3 to 10 wt. %, and, further wherein, the composition comprises less than 5 wt. % of unreacted (meth)acrylate monomer and is substantially free of unreacted isocyanate. Regardless of their hardness or lack thereof, the endpoint detection windows provide excellent durability when wet.