Elastomer-modified chemical mechanical polishing pad
View Patent ↗The chemical mechanical polishing pad is suitable for polishing at least one of semiconductor, optical and magnetic substrates. The polishing pad includes a polymeric matrix with an elastomeric polymer distributed within the polymeric matrix. The polymeric matrix has a glass transition above room temperature; and the elastomeric polymer has an average length of at least 0.1 μm in at least one direction, represents 1 to 45 volume percent of polishing pad and has a glass transition temperature below room temperature. The polishing pad has an increased diamond conditioner cut rate in comparison to a polishing pad formed from the polymeric matrix without the elastomeric polymer.
1. A chemical mechanical polishing pad suitable for polishing at least one of semiconductor, optical and magnetic substrates, the polishing pad comprising a polymeric matrix with an elastomeric polymer distributed within the polymeric matrix, the polymeric matrix having a glass transition above room temperature, the polymeric matrix including a polymer derived from difunctional or polyfunctional isocyanates and the polymeric matrix includes at least one selected from polyetherureas, polyisocyanurates, polyurethanes, polyureas, polyurethaneureas, copolymers thereof and mixtures thereof and the elastomeric polymer having a glass transition temperature below room temperature and an average length of at least 0.1 μm in at least one direction, the elastomeric polymer representing 1 to 45 volume percent of polishing pad and the elastic polymer having a glass transition temperature below room temperature, and the polishing pad having an increased diamond conditioner cut rate in comparison to a polishing pad formed from the polymeric matrix without the elastomeric polymer and the cut rate being measured in accordance with ASTM 11044-05 modified to measure weight loss.
2. The polishing pad of claim 1 wherein the elastomeric polymer includes functional groups that bond to the polymeric matrix.
3. The polishing pad of claim 1 wherein the elastomeric polymer has an average length of 0.15 to 100 μm as measured in at least one direction.
4. The polishing pad of claim 1 wherein the elastomeric polymer includes at least one selected from polymers and copolymers derived from butadiene, acrylate, methacrylate, siloxane, or olefinic backbones.
5. The polishing pad of claim 1 wherein the elastomeric polymer is formed in situ.
6. The polishing pad of claim 5 wherein the elastomeric polymer contains at least one of either butadiene-acrylonitrile copolymers or butadiene homopolymers.