Functional fluid composition
AssigneeBASF SE
InventorsHarald Dietl, Bayram Aydin, Stefan Dambach
Life of this patent
Estimating the term…
Abstract
A functional fluid composition useful as a brake fluid comprising from 0 to 94.99% by weight of alkoxy glycols of borate esters, from 5 to 99.99% by weight of alkoxy glycols, from 0.01 to 5% by weight of alkoxylates of saturated or unsaturated hydroxy-substituted fatty acids such as ricinoleic acid or esters thereof, the hydroxyl group located on the fatty acid side chain being etherified by at least one oxyalkylene unit, and from 0 to 10% by weight of an additive package comprising additives with corrosion inhibition action.
Claims11
A brake fluid composition, comprising:
- (A) from 15 to 90% by weight, based on a total weight of the composition, of one or more alkoxy glycol borate esters having formula (I)
- [R1—O—(CH2CH2—O)n]3B (I)
- wherein R1 is a C1- to C8-alkyl radical or a mixture of such radicals and n has a value of from 2 to 6;
- (B) from 5 to 99.99% by weight, based on the total weight of the composition, of one or more alkoxy glycol components having formula (II)
- R2—O—(CH2CH2—O)m—H (II)
- wherein R2 is a C1- to C8-alkyl radical or a mixture of such radicals and m has a value of from 2 to 6, and R2 is different or identical to R1 and/or m is different or identical to n;
- (C) from 0.01 to 5% by weight, based on the total weight of the composition, of an alkoxylate of naturally occurring castor oil,
- wherein hydroxyl group located on fatty acid side chain of the alkoxylate is etherified by at least one oxyalkylene unit;
- and
- (D) from 0 to 10% by weight, based on the total weight of the composition, of an additive package comprising one or more additives with corrosion inhibition action,
- wherein the brake fluid composition does not comprise a defoamer.
A method for preparing a brake fluid, the method comprising:
- introducing an alkoxylate of naturally occurring castor oil, which has hydroxyl group located on fatty acid side chain etherified by at least one oxyalkylene unit, as an additive with lubricating action into the brake fluid.
Dependencies are inferred from the claim text.