LOW BORATE BRAKE FLUID

2020DE404 WO 24 Abstract Borate-free low viscosity functional fluid composition This invention relates to a functional fluid, comprising (A) from 50 to 85, preferably 60 - 82 wt.-% of alkoxy glycol according to formula (I) CH3 ¨ 0 ¨ (CH2¨ CH2¨ 0)n ¨H (I) wherein n is a number from 2 to 5, with the proviso that in at least 30 wt.-% of all compounds according to formula (I) n is 3, and (B) from 1 to 20, preferably 1.5 to 10 wt.-% of alkoxy glycol according to formula (II) Ri ¨ 0 ¨ (CH2 ¨ CH2 ¨ 0)m ¨ H (II) wherein 1 5 Ri is a C2 to C8 alkyl residue, m is a number from 2 to 6, with the proviso that in at least 65 wt.-% of all compounds according to formula (II) m is 3, and (C) from 6 to 35, preferably 1 0 - 25 wt.-% of at least one compound according to formula (III) H ¨ 0 - (CH2 ¨ CH2 ¨ O)k ¨ H (III) wherein k is a number of 2 or higher, with the proviso that in at least 80 wt.-% of all compounds according to formula (III) k is 2 or 3, (D) at least one additive, selected from the group consisting of corrosion inhibitor, amines, stabilizers, defoamers and lubricants, the fluid comprising at most 3 wt.-% of an ester between boric acid and a glycol or alkyl polyglycol compound. Date Recue/Date Received 2021-04-15