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US 2003/0141482 A1Published application
Hydraulic fluids having improved corrosion protection for non-ferrous metals
OwnerBernd Wenderoth, Michael Roida +2inventors
InventorsBernd Wenderoth, Michael Roida, Knut Oppenlander, Ralf Strauss
Life of this patent
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Abstract
Hydraulic fluids, in particular brake fluids for motor vehicles, contain from 0.005 to 0.5% by weight of one or more heterocyclic compounds I 1 where (i) X is N, Y is CR and Z is N or (ii) X is N, Y is N and Z is N or CR or (iii) X is CR, Y is N and Z is N, R being hydrogen, halogen or an organic radical R1 of 1 to 30 carbon atoms and n being 0, 1 or 2.
Claims7
A hydraulic fluid having improved corrosion protection for nonferrous metals, containing from 0.005 to 0.5% by weight of one or more heterocyclic compounds of the formula I
- 3
- where
- (i) X is N, Y is CR and Z is N or
- (ii) X is N, Y is N and Z is N or CR or
- (iii) X is CR, Y is N and Z is N,
- R, in each case independently of further radicals R present, being hydrogen or a radical R1,
- R1, in each case independently of further radicals R1 present, being alkyl, aryl, aralkyl, halogen, haloalkyl, unsubstituted or alkyl-, aryl- or aralkyl-substituted amino, a heterocyclic radical, cyano, carboxyl, alkoxycarbonyl, hydroxyl or alkoxy, said organic radicals R1 each having 1 to 30 carbon atoms, and
- n being 0, 1 or 2.
5 more elements
Dependencies are inferred from the claim text.