Diesel engine cooling system compositions

Claim 2

A heavy duty supplemental cooling additive composition for use in diesel engine coolants which performs the functions of buffering, liner pitting inhibition, metal corrosion and hot surface corrosion protection, defoaming and scale inhibition, said additive comprising: (a) a sodium-free buffer containing at least one compound selected from the group consisting of borate and phosphate salts, (b) a cavitation liner pitting inhibitor containing at least one compound selected from the group consisting of nitrite and molybdate salts, (c) a metal corrosion and hot surface corrosion inhibitor containing at least one compound selected from the group consisting of nitrates, silicates and azole compounds, (d) a defoamer containing at least one compound selected from the group consisting of silicone defoamers, alcohols and glycols, and (e) a hot surface deposition and scale inhibitor containing at least one compound selected from the group consisting of phosphonates, polyacrylates and sulfonate compounds.

Claim 3

A composition according to claim 1 wherein the buffer contains at least one compound selected from the group consisting of potassium borate and potassium phosphate salts to provide internal leak tracing.

Claim 4

A heavy duty supplemental cooling additive composition for use in diesel engine coolants which performs the functions of buffering, liner pitting inhibition, metal corrosion and hot surface corrosion protection, defoaming, scale inhibition and detergency, said additive comprising: (a) a sodium-free buffer containing at least one compound selected from the group consisting of borate and phosphate salts, (b) a cavitation liner pitting inhibitor containing at least one compound selected from the group consisting of nitrite and molybdate salts, (c) a metal corrosion and hot surface corrosion inhibitor containing at least one compound selected from the group consisting of nitrates, silicates and azole compounds, (d) a defoamer containing at least one compound selected from the group consisting of silicone defoamers, alcohols and glycols, (e) a hot surface deposition and scale inhibitor containing at least one compound selected from the group consisting of phosphonates, polyacrylates and sulfonate compounds, and (f) a detergent containing at least one compound selected from the group consisting of non-ionic and anionic surfactants.

Claim 5

A heavy duty supplemental cooling additive composition for use in diesel engine coolants which performs the functions of buffering, liner pitting inhibition, metal corrosion and hot surface corrosion protection, defoaming, scale inhibition and detergency, said additive comprising: (a) a sodium-free buffer containing at least one compound selected from the group consisting of borate and phosphate salts, (b) a cavitation liner pitting inhibitor containing at least one compound selected from the group consisting of nitrite and molybdate salts, (c) a metal corrosion and hot surface corrosion inhibitor containing at least one compound selected from the group consisting of nitrates, silicates and azole compounds, (d) a defoamer containing at least one compound selected from the group consisting of silicone defoamers, alcohols and glycols, (e) a hot surface deposition and scale inhibitor containing at least one compound selected from the group consisting of phosphonates, polyacrylates and sulfonate compounds, and (f) a detergent containing at least one compound selected from the group consisting of non-ionic and anionic surfactants.

Claim 6

A composition according to claim 3 wherein the detergent contains at least one compound selected from the group consisting of a sodium alkyl sulfonate, a sodium aryl sulfonate, a sodium alkyl aryl sulfonate and a linear alkyl benzene sulfonate.

Claim 7

A composition according to claim 3 wherein the buffer contains at least one compound selected from the group consisting of potassium borate and potassium phosphate salts to provide internal leak tracing.

Claim 8

A heavy duty supplemental cooling additive composition comprising: ______________________________________ Approximate Component Weight Percentage ______________________________________ Dipotassium Phosphate 36.215 Sodium Molybdate Dihydrate 8.607 Potassium Nitrite 9.074 Potassium Silicate 3.44 Disodium Adipate 6.148 Mercaptobenzothiazole 6.148 Tolyltriazole 3.689 Potassium Nitrate 19.880 Polyethylene oxide 0.060 Calcium Sulfonate 1.845 Polyethoxylated alcohol 1.845 Sodium Xylene Sulfonate 1.082 Silicone Antifoam 0.369 Copolymer of methacrylic acid and 0.615 2-acrylamido-2-methylpropane sulfonic acid Dye 0.246 Fluorescent Dye 0.123 Polyacrylate Scale Inhibitor 0.615 ______________________________________

Claim 9

A heavy duty supplemental cooling additive composition comprising: ______________________________________ Approximate Component Weight Percentage ______________________________________ Dipotassium Phosphate 36.215 Sodium Molybdate Dihydrate 8.607 Potassium Nitrite 9.074 Potassium Silicate 3.44 Disodium Adipate 6.148 Mercaptobenzothiazole 6.148 Tolyltriazole 3.689 Potassium Nitrate 19.880 Polyethylene oxide 0.060 Calcium Sulfonate 1.845 Polyethoxylated alcohol 1.845 Sodium Xylene Sulfonate 1.082 Silicone Antifoam 0.369 Copolymer of methacrylic acid and 0.615 2-acrylamido-2-methylpropane sulfonic acid Dye 0.246 Fluorescent Dye 0.123 Polyacrylate Scale Inhibitor 0.615 ______________________________________

Claim 10

A method of maintaining the cooling efficiency of a diesel engine which comprises adding to the cooling system a composition according to claim 1 in an amount of from about 2,000 to 40,000 milligrams per liter of the diesel engine coolant.

Claim 11

A method of maintaining the cooling efficiency of a diesel engine which comprises adding to the cooling system a composition according to claim 2 in an amount of from about 2,000 to 40,000 milligrams per liter of the diesel engine coolant.

Claim 12

A method of maintaining the cooling efficiency of a diesel engine which comprises adding to the cooling system a composition according to claim 3 in an amount of from about 2,000 to 40,000 milligrams per liter of the diesel engine coolant.

Claim 13

A method of maintaining the cooling efficiency of a diesel engine which comprises adding to the cooling system a composition according to claim 5 in an amount of from about 2,000 to 40,000 milligrams per liter of the diesel engine coolant.