Patent ID: 8568610

Claim:
A stabilized, concentratable chemical mechanical polishing composition for polishing of dielectric layers in interlayer dielectric and shallow trench isolation processes, consisting of, as initial components: water; an abrasive, wherein the abrasive is a colloidal silica abrasive; a diquaternary substance according to formula (I): wherein each X is a nitrogen ; wherein R 1 is selected from a C 2-6 alkyl group; wherein R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are each independently selected from a hydrogen and a C 1-6 alkyl group; and, wherein the anion in formula (I) can be any anion or combination of anions that balance the 2+ charge on the cation in formula (I); a derivative of guanidine according to formula (II): wherein R 8 ,R 9 , R 10 , R 11 and R 12 are each independently selected from a hydrogen and a C 1-4 alkyl group; and, optionally, a quaternary ammonium salt, wherein the quaternary ammonium salt is selected from tetraethyl ammonium hydroxide, tetramethyl ammonium hydroxide and tetrabutylammonium hydroxide; and, wherein the chemical mechanical polishing composition is concentratable; and, wherein the chemical mechanical polishing composition exhibits storage stability when in a concentrated form having 18 wt % of the colloidal silica abrasive, 0.12 wt % of the diquaternary substance according to formula I, 0.03 wt % of the derivative of guanidine according to formula II and, optionally, 0.045 wt % of the quaternary ammonium salt, such that a viscosity of the chemical mechanical polishing composition increases less than 5% following storage at 55° C. for one week.