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US 6,783,693 B1Granted
Hydraulic fluids, containing cyclic carboxylic acid derivatives
AssigneeBASF SE
InventorsBayram Aydin, Uwe Fidorra, Arthur Höhn, Ladislaus Meszaros, Jan Nouwen, Knut Oppenländer, Michael Roida, Michael Stösser, Bernd Wenderoth
Life of this patent
Estimating the term…
Abstract
Hydraulic fluids, in particular brake fluids for motor vehicles, comprising from 0.01 to 50 wt % of one or more cyclic carboxylates, or cyclic carboxamides, which can carry a linear or branched C1-bis C20 alkyl group on the nitrogen atom.
Claims10
A hydraulic fluid, comprising from 0.01 to 10 wt % of one or more cyclic carboxylic derivatives of the general formula I
- in which
- X stands for an oxygen atom or a group of the formula N—R1, in which
- R1 denotes hydrogen or a linear or branched C1-C20 alkyl group, which can additionally be interspersed by up to 9 non-adjacent oxygen atoms and/or can carry up to 6 hydroxyl groups, or designates cycloalkyl or a (substituted) phenyl group,
- A denotes a group of the formula —CR2R3—, in which
- R2 and R3 stand for hydrogen or C1-C8 alkyl groups, which can additionally be interspersed by up to 4 non-adjacent oxygen atoms and/or can carry up to 3 hydroxyl groups, and
- n denotes a number from 2 to 7.
3 more elements
Dependencies are inferred from the claim text.