Patent ID: 11946014
Assignee: SHELL USA, INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A water/glycol-based hydraulic fluid that includes water at between 20 and 60 mass %, between 20 and 60 mass % of glycol, a fatty acid and a dimer acid, wherein the total fatty acid and dimer acid is more than 0.4 mass % and no more than 1.2 mass % as a fatty acid lubricant, and also a phosphate ester represented by the following general formula (1):, , where R1 and R2 each represent a hydrogen atom or a hydrogen group with a carbon number between 1 and 30, and may either be mutually identical or mutually different; R3 is —CH(CH3)- or —CH2-CH2-; R4 represents a hydrogen atom or a hydrocarbon group with a carbon number between 1 and 30; and wherein X1 and X2 of the phosphate ester are oxygen atoms and X3 and X4 are sulfur atoms.