Patent ID: 7651556

Claim:
A treating agent for forming a protective coating, comprising: an alkali silicate, as represented by the formula M 2 O.nSiO 2 [where n represents a number of 2 to 9, and M represents at least one of Na, K, Li, and NR 4 (where R independently represents a hydrogen atom or an alkyl group)] in an amount of 15-95 mass % based on the total mass of alkali silicate and lubricating component; at least one lubricating component selected from among soaps, metallic soaps, waxes, and polytetrafluoroethylenes in an amount of 5-85 mass % based on the total mass of alkali silicate and lubricating component; at least one viscosity modifier in an amount of 1 to 10 wt % based on the total mass of alkali silicate and lubricating component; and water; wherein the at least one viscosity modifier comprises at least one inorganic thickener selected from the group consisting of finely powdered silica, bentonite, kaolin, and synthetic hectorite.