Patent ID: 7858527

Claim:
A method of polishing, comprising: preparing a slurry composition which includes an additive composition comprising about 50 to about 95% by weight of a first salt of polymeric acid including a first polymeric acid having a first weight average molecular weight and a first base material, and about 5 to about 50% by weight of a second salt of polymeric acid including a second polymeric acid having a second weight average molecular weight and a second base material, wherein the weight percentages are based on a sum of the first and second salts of polymeric acid, and each of the first and second salts of polymeric acid is independently selected from the group consisting of poly(acrylic acid), poly(acrylic acid-co-maleic acid) and poly(methyl vinyl ether-alt-maleic acid); providing the slurry composition onto a surface portion of a polishing pad; and contacting the surface portion of the polishing pad with a surface of a material to be processed to polish the surface of the material to be processed, wherein the slurry composition is prepared such that the first salt of polymeric acid is different from the second salt of polymeric acid, the second weight average molecular weight is from about 10 to about 1,000 times larger than the first weight average molecular weight, and the first base material is the same as or different than the second base material.