Patent ID: 7134947

Claim:
A chemical mechanical polishing system, comprising: a platen for coupling a polishing pad thereto, the platen having a first surface comprising a generally circular center portion and an annular portion surrounding the generally circular center portion; the generally circular center portion enclosing an area and having a first attachment surface area that is between approximately 30% and 70% of the area enclosed by the generally circular center portion, the first attachment surface area adapted to couple an inner portion of the polishing pad to the platen; the generally circular center portion having a first fluoropolymer coating disposed outwardly therefrom, the first fluoropolymer coating having a low surface wetting coefficient; the annular portion having a second attachment surface area adapted to couple an outer portion of the polishing pad to the platen, the annular portion having a width between approximately one-half inch and approximately one inch; the annular portion having a second fluoropolymer coating disposed outwardly therefrom, the second fluoropolymer coating having a high surface wetting coefficient; and wherein the first and second fluoropolymer coatings each have a thickness of between approximately ten mils and approximately twenty mils.