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US 12,680,008 B2Granted
Coolant composition
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYasuaki Kodama
Life of this patent
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Abstract
A coolant composition includes a mineral oil or a synthetic oil and a surfactant, in which a conductivity of the coolant composition is lower than 0.1 μS/cm, and the surfactant is a nonionic surfactant that is a fatty acid ester having a freezing point of lower than −15° C. and having a cyclic structure.
Claims3
A coolant composition comprising:
- 90 mass % of a mineral oil as a base oil;
- 5 mass % of a sucrose fatty acid ester as a nonionic surfactant, wherein the sucrose fatty acid ester has a freezing point of less than −15° C. and a cyclic structure, and wherein an alkyl group of the fatty acid ester has a linear or branched structure;
- and
- 5 mass % of water, wherein the mass % is based on a total mass of the mineral oil, the sucrose fatty acid ester and the water,
- wherein an electrical conductivity of the coolant composition is lower than 0.0009 μS/cm, and
- a viscosity of the coolant composition at −15° C. is less than 40 mm2/s.
3 more elements
Dependencies are inferred from the claim text.