Low viscosity functional fluids

摘要

Low viscosity functional fluids are described which comprises methoxy polyethylene glycol. The fluids are particularly well-suited for use as DOT 4 brake fluids and provide high ERBP, WERBP, low kinematic viscosity and low SBR volume % increase.

主权项

1. A functional fluid composition comprising
(i) an alkoxy glycol mixture in an amount of 38% to 47% by weight of the functional fluid composition, where the alkoxy glycol mixture is comprised alkoxy glycols having the formula: wherein each of R1, R2, R3, R4, R5 is either hydrogen (H) or an alkyl group containing 1 to 8 or more carbon atoms or mixtures thereof, wherein said mixture has a first alkoxy glycol component in an amount of 36% to 73% by weight of said alkoxy glycol mixture where n=3, a second alkoxy glycol component from 17% to 43% by weight of said alkoxy glycol mixture where n=4, and a third alkoxy glycol component in an amount from 2% to 10% by weight of said alkoxy glycol mixture where n is greater than or equal to 5 and (ii) a glycol borate ester in an amount of 53% to 62% by weight of the functional fluid composition.