Low viscosity functional fluid composition
AssigneeClariant International Ltd.
InventorFelix Hoevelmann
Life of this patent
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Abstract
This invention relates to a functional fluid, comprising: (A) from 50 to 85 wt.-% of alkoxy glycol according to formula (I): CH3—O—(CH2—CH2—O)n—H, 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 wt.-% of alkoxy glycol according to formula (II): R1—O—(CH2—CH2—O)m—H, wherein R1 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 wt.-% of at least one compound according to formula (III): H—O—(CH2—CH2—O)k—H, 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.
Claims26
A functional fluid, comprising
- (A) from 50 to 85 wt.-% of alkoxy glycol according to formula (I)
- CH3—O—(CH2—CH2—O)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;
- (B) from 1 to 15 wt.-% of alkoxy glycol according to formula (II)
- R1—O—(CH2—CH2—O)m—H (II)
- wherein
- R1 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;
- (C) from 6 to 35 wt.-% of at least one compound according to formula (III)
- H—O—(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;
- and
- (D) at least one additive, selected from the group consisting of corrosion inhibitor, amines, stabilizers, defoamers and lubricants,
- wherein the fluid comprises at most 3 wt.-% of an ester of boric acid and a glycol or alkyl polyglycol compound.
A brake fluid comprising
- (A) from 50 to 85 wt.-% of alkoxy glycol according to formula (I)
- CH3—O—(CH2—CH2—O)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;
- (B) from 1 to 15 wt.-% of alkoxy glycol according to formula (II)
- R1—O—(CH2—CH2—O)m— (II)
- wherein
- R1 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;
- (C) from 6 to 35 wt.-% of at least one compound according to formula (III)
- H—O—(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;
- and
- (D) at least one additive, selected from the group consisting of corrosion inhibitor, amines, stabilizers, defoamers and lubricants,
- wherein the fluid comprises at most 3 wt.-% of an ester of boric acid and a glycol or alkyl polyglycol compound.
A method of operating a vehicular brake, the method comprising the step of transmitting hydraulic pressure by a fluid comprising
- (A) from 50 to 85 wt.-% of alkoxy glycol according to formula (I)
- CH3—O—(CH2—CH2—O)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;
- (B) from 1 to 15 wt.-% of alkoxy glycol according to formula (II)
- R1—O—(CH2—CH2—O)m—H (II)
- wherein
- R1 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;
- (C) from 6 to 35 wt.-% of at least one compound according to formula (III)
- H—O—(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;
- and
- (D) at least one additive, selected from the group consisting of corrosion inhibitor, amines, stabilizers, defoamers and lubricants,
- wherein the fluid comprises at most 3 wt.-% of an ester of boric acid and a glycol or alkyl polyglycol compound.
Dependencies are inferred from the claim text.