Patent ID: 8273142

Claim:
A chemical-mechanical polishing composition consisting essentially of: (a) silica, (b) one or more organic carboxylic acids, salts, or hydrates thereof selected from the group consisting of (i) dicarboxylic acids of the formula: wherein n is an integer of 0-8 and each of R 1 and R 2 is independently selected from the group consisting of hydrogen, a hydroxyl group, and C 1 -C 6 alkyl groups, or R 1 and R 2 together form an oxo group, and when n is 2 or more, the bonds between the CR 1 R 2 groups are independently selected from the group consisting of single, double, or triple bonds; (ii) amino acids of the formula: wherein each of R 1 , R 2 , R 3 , and R 4 is independently selected from the group consisting of hydrogen, an aminoalkyl group, a carboxyalkyl group, a hydroxyalkyl group, a —(CH 2 ) n — group, and —(CH═CH—) n group connecting either R 1 or R 2 with either R 3 or R 4 , wherein n is an integer of 1-6; (iii) hydroxy acids of formula (1): wherein n is an integer of 0-8, and each of R 1 -R 3 is independently selected from the group consisting of hydrogen, alkyl, hydroxy, and hydroxyalkyl, wherein at least one of R 1 -R 3 is hydroxy or hydroxyalkyl, or formula (2): wherein n is an integer of 1-5; (iv) carboxy substituted pyrazine compounds; and (v) carboxy substituted triazole compounds, (c) one or more polysaccharides selected from the group consisting of a hydroxyalkylcellulose, carrageenan, and xanthan gum, (d) one or more bases, (e) optionally one or more surfactants and/or polymers, (f) optionally one or more reducing agents, (g) optionally one or more biocides, and (h) water, wherein the polishing composition has an alkaline pH.