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US 8,846,588 B2Granted
Low viscosity functional fluids
AssigneeDow Global Technologies LLC
InventorsPearl Crossen, Jin Zhao
Life of this patent
Estimating the term…
Abstract
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.
Claims19
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.
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 of 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 the alkoxy glycol mixture includes from 36% to 73% by weight of methoxy triethylene glycol based on the total weight of the alkoxy glycol mixture;
- from 17% to 43% methoxy tetra ethylene glycol, based on the total weight of the alkoxy glycol mixture;
- and from 2% to 10% methoxy polyethylene glycol, based on the total weight of the alkoxy glycol mixture, wherein the methoxy polyethylene glycol has n that is greater than or equal to 5;
- (ii) a glycol borate ester in an amount of 53% to 62% by weight of the functional fluid composition;
- (iii) greater than 0 to 3 weight % of one or more corrosion inhibitors, based on the total weight of the functional fluid composition;
- and
- (iv) greater than 0 to 1 weight % of one or more antioxidants, based on the total weight of the functional fluid composition;
- wherein the fluid composition has an equilibrium reflux boiling point of at least 230° C., a wet equilibrium reflux boiling point of at least 155° C., and a kinematic viscosity of not more than 1800 cST at −40° C.
6 more elements
Dependencies are inferred from the claim text.