Abstract: A coolant composition includes a viscosity improving agent and a base. The viscosity improving agent includes at least one nonionic surfactant and at least one anionic surfactant represented by the following Formula (1) of R1O—(R2O)m—SO3M. The base is formed of water and/or at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether. R1 represents a linear or branched alkyl group having 16 to 24 carbon atoms or a linear or branched alkenyl group having 16 to 24 carbon atoms, R2 represents an ethylene group or a propylene group, m represents an average addition molar number of R2O which is a number of 0.5 to 10, and M represents a cation or a hydrogen atom. A shear viscosity of the coolant composition is 8.5 mPa·s or higher at 25° C. and is 2.0 mPa·s or lower at 100° C.

Abstract: An automotive engine coolant composition includes: a non-silicone surfactant; an anti-foaming agent containing a mineral oil and silica; and a base, in which the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C. and 2.0 mm2/s or less at 100° C., and with respect to 100 parts by mass of the coolant composition, a content of the mineral oil is 0.01 to 0.4 parts by mass and a content of the silica is 0.003 to 0.1 parts by mass.

Abstract: An automotive engine coolant composition includes: a surfactant as a viscosity index improver; a rubber swelling inhibitor; and a base, in which the rubber swelling inhibitor is at least one selected from a compound expressed by a following formula (1) [in the formula, R1 is hydrogen, a methyl group, or an ethyl group] and a compound expressed by a following formula (2) [in the formula, R2 is hydrogen, a methyl group, or an ethyl group], the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C., and a content of the rubber swelling inhibitor is 0.03 parts by mass or more and 0.9 parts by mass or less with respect to 100 parts by mass of the coolant composition.

Abstract: A coolant composition includes a viscosity improving agent and a base. The viscosity improving agent includes at least one nonionic surfactant and at least one anionic surfactant represented by the following Formula (1) of R1O—(R2O)m-SO3M. The base is formed of water and/or at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether. R1 represents a linear or branched alkyl group having 16 to 24 carbon atoms or a linear or branched alkenyl group having 16 to 24 carbon atoms, R2 represents an ethylene group or a propylene group, m represents an average addition molar number of R2O which is a number of 0.5 to 10, and M represents a cation or a hydrogen atom. A shear viscosity of the coolant composition is 8.5 mPa·s or higher at 25° C. and is 2.0 mPa·s or lower at 100° C.

Abstract: An automotive engine coolant composition includes: a surfactant as a viscosity index improver; a rubber swelling inhibitor; and a base, in which the rubber swelling inhibitor is at least one selected from a compound expressed by a following formula (1) [in the formula, R1 is hydrogen, a methyl group, or an ethyl group] and a compound expressed by a following formula (2) [in the formula, R2 is hydrogen, a methyl group, or an ethyl group], the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C., and a content of the rubber swelling inhibitor is 0.03 parts by mass or more and 0.9 parts by mass or less with respect to 100 parts by mass of the coolant composition.

Abstract: An automotive engine coolant composition includes: a non-silicone surfactant; an anti-foaming agent containing a mineral oil and silica; and a base, in which the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C. and 2.0 mm2/s or less at 100° C., and with respect to 100 parts by mass of the coolant composition, a content of the mineral oil is 0.01 to 0.4 parts by mass and a content of the silica is 0.003 to 0.1 parts by mass.

Abstract: A coolant composition includes a viscosity improving agent and a base. The viscosity improving agent includes at least one selected from an anionic surfactant represented by the following Formula (1) of R1O—(R2O)m—SO3M and at least one selected from the group consisting of a cationic surfactant represented by the following Formula (2) and an amphoteric surfactant represented by the following Formula (3) or Formula (4). The base is formed of water and/or at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether, in which a shear viscosity is 8.5 mPa·s or higher at 25° C. and is 2.0 mPa·s or lower at 100° C.

Abstract: This invention provides a coolant composition for an automobile engine which achieves retained thickening effects of a surfactant as a viscosity, and a concentrated coolant composition for an automobile engine used to obtain such coolant composition. Such coolant composition for an automobile engine comprises: (A) a silicone-based oil compound; (B) polyether-modified silicone; (C) a non-silicone-based surfactant; and (D) an aqueous base, wherein the silicone-based oil compound (A) comprises: (A1) at least one selected from among organopolysiloxanes represented by General Formula (1); and (A2) a filler, and the polyether-modified silicone (B) is at least one member selected from among polyoxyalkylene-modified organopolysiloxanes represented by General Formula (2).

Abstract: A coolant composition includes: a viscosity improving agent; at least one alkali metal compound selected from the group consisting of alkali metal salts and alkali metal hydroxides; and a base composed of water and/or at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether, wherein the viscosity improving agent is a compound represented by a formula of R1O—(R2O)m—SO3M, where R1 represents a linear or branched alkyl or alkenyl group having 16 to 24 carbon atoms, R2 represents an ethylene group or a propylene group, m represents an average addition molar number of R2O and a number from 0.5 to 10, and M represents a cation or a hydrogen atom, and a kinetic viscosity of the coolant composition is 8.5 mm2/sec or higher at 25° C. and is 2.0 mm2/sec or lower at 100° C.

Abstract: A coolant composition includes: a viscosity improving agent; at least one alkali metal compound selected from the group consisting of alkali metal salts and alkali metal hydroxides; and a base composed of water and/or at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether, wherein the viscosity improving agent is a compound represented by a formula of R1O—(R2O)m—SO3M, where R1 represents a linear or branched alkyl or alkenyl group having 16 to 24 carbon atoms, R2 represents an ethylene group or a propylene group, m represents an average addition molar number of R2O and a number from 0.5 to 10, and M represents a cation or a hydrogen atom, and a kinetic viscosity of the coolant composition is 8.5 mm2/sec or higher at 25° C. and is 2.0 mm2/sec or lower at 100° C.

Abstract: A coolant used for cooling down a stack of fuel cells includes: a solution mixture of water and a glycol as base material; and a rust-preventive additive that functions to keep an electric conductivity of the coolant at a low level and to maintain a hydrogen ion exponent of the coolant in a substantially neutral level. The rust-preventive agent includes at least one of an alkaline ethanolamine additive, such as triethanolamine, diethanolamine, or monoethanolamine, and an acidic additive selected among the group consisting of triazole compounds, phosphoric acid compounds, and organophosphoric acid compounds.

Abstract: When a coolant composition characterized in that ion exchange resin is uniformly dispersed in a water-based coolant is used as a coolant for a fuel cell stack from a viewpoint of high-voltage safety, eluted substance from parts in the cooling system is removed in the initial stages and with the passage of time, so as to stably maintain insulation properties of the coolant.

Abstract: A liquid coolant composition with improved anti-corrosive property contains 85-99 weight % of an agent for lowering the melting point selected from the group consisting of alcohols and glycol, and 1-15 weight % of a rust preventive composition. The rust preventive composition contains 0.00005-0.02 weight % at elemental metal concentration of calcium compounds or a mixture of 0.00005-0.02 weight % each of calcium and magnesium compounds, and at least one kind of rust preventive selected from the group consisting of phosphates, borates, nitrates, molybdates, benzoates, silicates, triazoles, thiazoles, sebacic acid and octylic acid. Still better results are obtained if 0.001-0.02 weight % of at least one kind of polyphosphoric or polycarboxylic acids is additionally contained.