Patent ID: 8088216

Claim:
A water-borne inorganic alkali metal silicate composition prepared by mixing an alkali metal silicate comprising a mixture of potassium silicate and sodium silicate, a colloidal silica, and a phosphate compound selected from a sodium phosphate compound, a potassium phosphate compound or a mixture thereof, wherein a molar ratio of a total silica solid content (SiO 2 ) to a total alkali metal solid content is within a range of 4.3 to 6.0; the total silica solid content (SiO 2 ) is a total of silica solid contents (SiO 2 ) in the alkali metal silicate and in the colloidal silica; and the total alkali metal solid content is a total of alkali metal solid contents in the alkali metal silicate and in the phosphate compound.