Patent ID: 7288212

Claim:
An additive composition for a slurry, comprising: about 50 to about 95% by weight of a first salt of polymeric acid including a first polymeric acid selected from the group consisting of poly(acrylic acid), poly(acrylic acid-co-maleic acid) and poly(methyl vinyl ether-alt-maleic acid), wherein the first salt of polymeric acid has 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 selected from the group consisting of poly(acrylic acid), poly(acrylic acid-co-maleic acid) and poly(methyl vinyl ether-alt-maleic acid) ), wherein the first salt of polymeric acid has a second weight average molecular weight and a second base material, wherein the first salt of polymeric acid is different from the second salt of polymeric acid, wherein the second weight average molecular weight is from about 10 to about 1000 times larger than the first weight average molecular weight, and wherein the first base material is the same as or different than the second base material.