EP1379615A1 - Hydraulic fluids with improved anti-corrosion properties - Google Patents

Hydraulic fluids with improved anti-corrosion properties

Info

Publication number
EP1379615A1
EP1379615A1 EP02759789A EP02759789A EP1379615A1 EP 1379615 A1 EP1379615 A1 EP 1379615A1 EP 02759789 A EP02759789 A EP 02759789A EP 02759789 A EP02759789 A EP 02759789A EP 1379615 A1 EP1379615 A1 EP 1379615A1
Authority
EP
European Patent Office
Prior art keywords
weight
fluids
triazole
motor vehicles
corrosion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02759789A
Other languages
German (de)
French (fr)
Other versions
EP1379615B1 (en
Inventor
Bernd Wenderoth
Michael Roida
Bayram Aydin
Uwe Fidorra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP1379615A1 publication Critical patent/EP1379615A1/en
Application granted granted Critical
Publication of EP1379615B1 publication Critical patent/EP1379615B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
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    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/78—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing boron
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    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
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    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/38—Heterocyclic nitrogen compounds
    • C10M133/44—Five-membered ring containing nitrogen and carbon only
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    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
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    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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    • C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms only
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    • C10M2209/1075—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106 used as base material
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    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/10—Phosphatides, e.g. lecithin, cephalin
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C10M2227/0615—Esters derived from boron used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C10M2227/062—Cyclic esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C10M2227/062—Cyclic esters
    • C10M2227/0625—Cyclic esters used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

  • Corrosion inhibitors in brake fluids have the task of preventing the destruction of metallic materials caused by corrosion.
  • the hydraulic fluids and brake fluids for motor vehicles known in the prior art are, however, in need of improvement with regard to their properties and in particular corrosion protection.
  • the object was therefore to provide hydraulic liquids which, in particular, meet the above-mentioned requirements for improved corrosion protection in metals and non-ferrous metals.
  • alkali metal salts of phosphoric acid and phosphorous acid fatty acids such as caprylic, auric, palitinic, stearic or oleic acid and their alkali metal salts, esters of phosphoric acid and phosphorous acid such as ethyl phosphate, dimethyl phosphate , Isopropyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite, optionally ethoxylated mono- and dialkylamines and their salts with mineral and fatty acids, for example butylamine, hexylamine, octylamine, isononylamine, oleylamine, dipropylamine, diisopropylamine or dibutylamine, optionally ethoxylated alkanolamines, for example mono-, di- or triethanolamine, N, N'-di-n-butyla
  • the present invention relates in particular to brake fluids for motor vehicles which contain the components (a) and optionally (b) mentioned as corrosion inhibitors.
  • the brake fluids for motor vehicles according to the invention contain, in addition to components (a) and optionally (b), 0.1 to 97% by weight, in particular 30 to 97% by weight, especially 50 to 97% by weight , one or more polyglycol ethers and / or their boric acid esters.
  • Suitable polyglycol ethers are above all ethylene glycol monoalkyl ethers with up to 6 ethylene oxide units and with up to 4 carbon atoms in the alkyl radical, such as, for example, methyldiglycol, methyltriglycol, butyltriglycol or methyltetraglycol.
  • Suitable boric acid esters of said polyglycol ethers or of other polyglycol ethers are described in particular in documents EP-B 013 925 (cyclic bis-boric acid esters), DE-C 28 04 535 (nitrogen-containing boric acid esters), DE-A 24 38 038 (boric acid-alkylene glycol) Monoalkyl ether esters) and DE-B 17 68 933 (tris-alkoxyalkyl borate).
  • hydraulic fluids or brake fluids for motor vehicles are their favorable low-temperature viscosity, good water compatibility, a gentle pH value, good low-temperature, high-temperature and oxidation stability as well as good chemical stability, favorable behavior (ie good behavior) Compatibility) with materials such as rubbers, plastics, glue joints, fiber, elastomer and rubber seals and similar materials as well as good lubrication behavior.
  • methyltriglycol-borate 43.44% by weight of a mixture of methyltriglycol, methyltetraglycol, butyltriglycol and methyldiglycol, 1.51% by weight of a mixture of 1,1'-iminodipropan-2-ol, Phenothiazine and a phosphoric acid ester 0.05 wt .-% lH-l, 2,3-tolutriazole
  • the brake fluids BF la and BF 2a according to the invention differ from BF 1 and BF 2 only in that instead of 0.05% by weight 1H-l, 2,3-tolutriazole they contain the same amount of 1H-1, 2,4 -Triazole contained;
  • the brake fluid BF 1b according to the invention contained 0.04% by weight of 1H-1, 2, 4-triazole and 0.01% by weight of adenine instead of 0.05% by weight of 1H-1, 2, 3-tolutriazole;
  • the brake fluid BF 1c according to the invention contained 0.07% by weight of 1H-1, 2, 4-triazole instead of 0.05% by weight of 1H-l, 2,3-tolutriazole (but only 54.98% by weight for this) % Methyl triglycol borate).
  • the application tests were carried out in accordance with the copper corrosion test PSA D 53 5387 in the version of the year 2000 from the company PSA Ober-Citroen.
  • a copper sheet with a total area of 1000 cm2 (dimensions: 71.4 cm x 7 cm x 0.05 cm) previously cleaned in acetone is rolled up in a spiral shape in the form of a round cylinder so that the metal surface inside does not touch.
  • the copper sheet is placed in a mixture of 294 ml of brake fluid with 6 ml of distilled water and heated to 100 ° C. for 100 hours; 10 liters of air are passed through the liquid per hour, which was previously passed through distilled water cooled to 2 ° C.

Abstract

The invention relates to hydraulic fluids, in particular brake fluids for motor vehicles, with improved anti-corrosion properties, containing (a) between 0.005 and 0.125 wt. % 1H-1,2,4-triazole and (b) between 0 and 10 wt. % of one or more corrosion inhibitors, whereby with the co-use of 1H-1,2,3-benzotriazole and/or 1H-1,2,3-tolyltriazole and/or their derivatives, the weight ratio of 1H-1,2,4-triazole to the aforementioned 1H-1,2,3-triazoles must be greater than 4:1.

Description

Hydraulische Flüssigkeiten mit verbessertem KorrosionsschutzHydraulic fluids with improved corrosion protection
Beschreibungdescription
Die vorliegende Erfindung betrifft hydraulische Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, mit verbessertem Korrosionsschutz, welcheThe present invention relates to hydraulic fluids, in particular brake fluids for motor vehicles, with improved corrosion protection, which
(a) 0,005 bis 0,125 Gew.-% 1H-1, 2,4-Triazol und(a) 0.005 to 0.125 wt% 1H-1, 2,4-triazole and
(b) 0 bis 10 Gew.-% eines oder mehrerer weiterer Korrosionsinhi- bitoren, wobei bei Mitverwendung von 1H-1,2, 3-Benzotriazol und/oder 1H-1, 2, 3-Tolutriazol und/oder deren Derivaten das Gew. -Verhältnis von 1H-1, 2,4-Triazol zu den genannten 1H-1,2, 3-Triazolen größer als 4:1 sein muß,(b) 0 to 10% by weight of one or more further corrosion inhibitors, where the weight of 1H-1,2, 3-benzotriazole and / or 1H-1, 2, 3-tolutriazole and / or their derivatives is also used Ratio of 1H-1, 2,4-triazole to said 1H-1,2, 3-triazoles must be greater than 4: 1,
enthalten.contain.
Hydraulische Flüssigkeiten und insbesondere Bremsflüssigkeiten für Kraftfahrzeuge unterliegen hinsichtlich ihrer chemischen und physikalischen Eigenschaften sehr hohen Anforderungen. Entsprechend der bestehenden Normen und Spezifikationen für Bremsflüssigkeiten vom US-Department of Transportation im Federal Mo- tor Vehicle Safety Standard FMVSS-Nr. 115 und der von der Society of Automotive Engineers herausgegebenen Norm S E J 1704 sollen moderne Bremsflüssigkeiten einerseits über hohe Trockenkochpunkte (Rückflußsiedepunkte, trocken [Equilibrium reflux boiling point, "ERBP"]) sowie hohe Naßkochpunkte (Rückflußsiedepunkte, feucht ["wet ERBP"]) verfügen, andererseits aber auch eine Viskosität aufweisen, die sich innerhalb eines weiten Temperaturbereiches nur wenig ändert.Hydraulic fluids and especially brake fluids for motor vehicles are subject to very high requirements with regard to their chemical and physical properties. According to the existing standards and specifications for brake fluids from the US Department of Transportation in the Federal Motor Vehicle Safety Standard FMVSS-No. 115 and the SEJ 1704 standard published by the Society of Automotive Engineers, modern brake fluids are said to have high dry boiling points (reflux boiling points, dry [ERBP "]) and high wet boiling points (reflux boiling points, moist [" wet ERBP "]) , but on the other hand also have a viscosity that changes only slightly within a wide temperature range.
Darüber hinaus bestehen weitergehende Anforderungen aus dem Kreis der Automobilindustrie nach einem verbesserten Korrosionsschutz bei Metallen und Buntmetallen. Korrosionsinhibitoren haben in Bremsflüssigkeiten die Aufgabe, die durch Korrosion verursachte Zerstörung metallischer Werkstoffe zu verhindern.In addition, there are further requirements from the automotive industry for improved corrosion protection for metals and non-ferrous metals. Corrosion inhibitors in brake fluids have the task of preventing the destruction of metallic materials caused by corrosion.
Der Einsatz von 1H-1, 2 ,3-Triazolen wie 1H-1, 2, 3-Benztriazol oder lH-l,2,3-Tolutriazol als Korrosionsinhibitoren in hydraulischen Flüssigkeiten bzw. Bremsflüssigkeiten ist seit langem bekannt, beispielsweise aus EP-A 028 789 (1) und EP-A 454 110 (2) .The use of 1H-1, 2, 3-triazoles such as 1H-1, 2, 3-benzotriazole or 1H-1, 2,3-tolutriazole as corrosion inhibitors in hydraulic fluids or brake fluids has long been known, for example from EP-A 028 789 (1) and EP-A 454 110 (2).
In der WO 00/46325 (3) werden Hydraulikflüssigkeiten empfohlen, die eine Kombination aus 1H-1,2, 3-Benzotriazol oder dessen Derivaten wie 1H-1,2, 3-Tolutriazuol und 1H-1, 2,4-Triazol oder dessen Derivaten im Gew. -Verhältnis von 1:4 bis 4:1 als Korrosionsinhibitorsystem enthalten. Zu Vergleichszwecken werden in Tabelle 1 bis 4 von (3) auch Hydraulikflüssigkeiten angegeben, die lH-l,2,4-Triazol allein in Konzentrationen von 0,15 Gew.-% ent- halten; deren korrosionsverhindernde Wirkung ist jedoch nur bei Kupfer akzeptabel.In WO 00/46325 (3) hydraulic fluids are recommended which contain a combination of 1H-1,2, 3-benzotriazole or its derivatives such as 1H-1,2, 3-tolutriazuol and 1H-1, 2,4-triazole or whose Derivatives in a weight ratio of 1: 4 to 4: 1 contained as a corrosion inhibitor system. For comparison purposes, hydraulic fluids are also given in Tables 1 to 4 of (3), which contain 1H-1,2,4-triazole alone in concentrations of 0.15% by weight; however, their corrosion-preventing effect is only acceptable for copper.
Die im Stand der Technik bekannten hydraulischen Flüssigkeiten und Bremsflüssigkeiten für Kraftfahrzeuge sind in Hinblick auf ihre Eigenschaften und insbesondere auf den Korrosionsschutz jedoch noch verbesserungsbedürftig. Es bestand daher die Aufgabe, hydraulische Flüssigkeiten bereitzustellen, welche insbesondere die oben genannten Anforderungen nach einem verbesserten Korrosionsschutz bei Metallen und Buntmetallen erfüllen.The hydraulic fluids and brake fluids for motor vehicles known in the prior art are, however, in need of improvement with regard to their properties and in particular corrosion protection. The object was therefore to provide hydraulic liquids which, in particular, meet the above-mentioned requirements for improved corrosion protection in metals and non-ferrous metals.
Demgemäß wurden die eingangs definierten hydraulischen oder kraftübertragenden Flüssigkeiten gefunden.Accordingly, the hydraulic or power transmission fluids defined at the outset were found.
Die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraf fahrzeuge, enthalten vorzugsweise 0,005 bis 0,10 Gew.-%, vorzugsweise 0,005 bis 0,08 Gew.-%, insbesondere 0,005 bis 0,06 Gew.-%, der Komponente (a) .The hydraulic fluids according to the invention, in particular brake fluids for motor vehicles, preferably contain 0.005 to 0.10% by weight, preferably 0.005 to 0.08% by weight, in particular 0.005 to 0.06% by weight, of component (a) ,
Die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, enthalten in einer bevorzugten Ausführungsform die Komponente (a) als alleinigen Korrosionsinhibitor auf Triazol-Basis. Damit ist gemeint, daß Triazole wie lH-l,2,3-Benzotriazol, 1H-1,2, 3-Tolutriazol oder hydriertes lH-l,2,3-Tolutriazol hierbei ausgeschlossen werden, anorganische und/oder organische Korrosionsinhibitoren anderer Struktur können jedoch anwesend sein.In a preferred embodiment, the hydraulic fluids according to the invention, in particular brake fluids for motor vehicles, contain component (a) as the sole corrosion inhibitor based on triazole. This means that triazoles such as 1H-1, 2,3-benzotriazole, 1H-1,2, 3-tolutriazole or hydrogenated 1H-1, 2,3-tolutriazole are excluded here, inorganic and / or organic corrosion inhibitors of a different structure can however be present.
In einer anderen bevorzugten Ausführungsform enthalten die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, noch bis zu 10 Gew.-%, insbesondere bis zu 5 Gew.-%, eines oder mehrerer weiterer Korro¬ sionsinhibitoren (b) , wobei bei Mitverwendung von 1H-1, 2, 3-Benzo- triazol und/oder 1H-1, 2, 3-Tolutriazol und/oder deren Derivaten das Gew. -Verhältnis von 1H-1, 2, 4-Triazol zu den genannten lH-l,2,3-Triazolen größer als 4:1 sein muß.In another preferred embodiment include hydraulic fluids according to the invention, in particular motor vehicle brake, even up to 10 wt .-%, in particular up to 5 wt .-% of one or more further Korro ¬ sion inhibitors (b), wherein in the concomitant use of 1H -1, 2, 3-benzotriazole and / or 1H-1, 2, 3-tolutriazole and / or their derivatives the weight ratio of 1H-1, 2, 4-triazole to the mentioned 1H-1,2 , 3-triazoles must be greater than 4: 1.
Als weitere Korrosionsinhibitoren (b) kommen hierbei vor allem Alkalimetallsalze von Phosphorsäure und phosphoriger Säure, Fettsäuren wie Capryl-, aurin-, Pal itin-, Stearin- oder Ölsäure so- wie deren Alkalimetallsalze, Ester der Phosphorsäure und der phosphorigen Säure wie Ethylphosphat, Dimethylphosphat, Isopro- pylphosphat, Diisopropylphosphat, Butylphosphit oder Dimethyl- phosphit, gegebenenfalls ethoxylierte Mono- und Dialkylamine und deren Salze mit Mineral- und Fettsäuren, z.B. Butylamin, Hexyl- amin, Octylamin, Isononylamin, Oleylamin, Dipropylamin, Diiso- propylamin oder Dibutylamin, gegebenenfalls ethoxylierte Alkanol- amine, z.B. Mono-, Di- oder Triethanolamin, N,N'-Di-n-Butylami- noethanol oder 1, 1' -Iminodipropan-2-ol, Cyclohexylamin, Benzimidazol und hydriertes Tolutriazol sowie Nitroaromaten, z.B. 3-Nitrobenzaldehyd, in Betracht.As further corrosion inhibitors (b) there are especially alkali metal salts of phosphoric acid and phosphorous acid, fatty acids such as caprylic, auric, palitinic, stearic or oleic acid and their alkali metal salts, esters of phosphoric acid and phosphorous acid such as ethyl phosphate, dimethyl phosphate , Isopropyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite, optionally ethoxylated mono- and dialkylamines and their salts with mineral and fatty acids, for example butylamine, hexylamine, octylamine, isononylamine, oleylamine, dipropylamine, diisopropylamine or dibutylamine, optionally ethoxylated alkanolamines, for example mono-, di- or triethanolamine, N, N'-di-n-butylaminoethanol or 1, 1'-iminodipropan-2-ol, cyclohexylamine, benzimidazole and hydrogenated tolutriazole and nitroaromatics, for example 3-nitrobenzaldehyde, into consideration.
Die genannte Korrosionsinhibitoren (b) liegen vorzugsweise in Mengen von 0,001 bis 10 Gew.-%, insbesondere 0,001 bis 5 Gew.-%, in den erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraf fahrzeuge, vor.The corrosion inhibitors (b) mentioned are preferably present in amounts of 0.001 to 10% by weight, in particular 0.001 to 5% by weight, in the hydraulic fluids according to the invention, in particular brake fluids for motor vehicles.
In einer besonders bevorzugten Ausführungsform enthalten die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesonderer Bremsflüssigkeiten für Kraftfahrzeuge, neben 1H-1, 2, 4-Triazol (a) als zusätzliche Korrosionsinhibitoren (b) 0,001 bis 5 Gew.-%, insbesondere 0,001 bis 0,5 Gew.-%, einer oder mehrerer Verbindungen aus der Gruppe Benzimidazol, hydriertes 1H-1, 2, 3-Tolutriazol, Purin, Adenin, 6-Chloropurin, 2, 6-Dichloropurin, 6-Me- thoxypurin, 1H-1, 2, 3-Triazolo (4, 5B)pyridin, 6-Histaminopurin und 6-Furfurylaminopurin und gegebenenfalls weitere von (a) verschiedene Korrosionsinhibitoren. Die genannten Purin-Derivate werden als Buntmetall-Korrosionsinhibitoren für hydraulische Flüssigkeiten bzw. Bremsflüssigkeiten in der deutschen Patentanmeldung Az. P 100 26 010.1 beschrieben.In a particularly preferred embodiment, the hydraulic fluids according to the invention, in particular brake fluids for motor vehicles, contain 0.001 to 5% by weight, in particular 0.001 to 0.5% by weight, in addition to 1H-1, 2, 4-triazole (a) as additional corrosion inhibitors (b) .-%, one or more compounds from the group benzimidazole, hydrogenated 1H-1, 2, 3-tolutriazole, purine, adenine, 6-chloropurine, 2, 6-dichloropurine, 6-methoxypurine, 1H-1, 2, 3-triazolo (4, 5B) pyridine, 6-histaminopurine and 6-furfurylaminopurine and optionally other corrosion inhibitors other than (a). The purine derivatives mentioned are described as non-ferrous metal corrosion inhibitors for hydraulic fluids or brake fluids in German patent application Az. P 100 26 010.1.
Alle vorstehenden und nachfolgenden Gew.- -Angaben beziehen sich jeweils auf die Gesamtmenge der hydraulischen Flüssigkeit bzw. der Bremsflüssigkeit, sofern nichts anderes angegeben ist. Die Summe aller vorstehend und nachfolgend aufgeführten Komponenten für die erfindungsgemäßen hydraulischen Flüssigkeiten bzw. Bremsflüssigkeiten addiert sich jeweils auf 100 Gew.-%.All of the above and following parts by weight relate to the total amount of hydraulic fluid or brake fluid, unless otherwise stated. The sum of all the components listed above and below for the hydraulic fluids or brake fluids according to the invention adds up to 100% by weight.
Gegenstand der vorliegenden Erfindung sind insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, die als Korrosionsinhibitoren die genannten Komponenten (a) und gegebenenfalls (b) enthalten.The present invention relates in particular to brake fluids for motor vehicles which contain the components (a) and optionally (b) mentioned as corrosion inhibitors.
Die erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge enthalten in einer bevorzugten Ausführungsform neben den Komponenten (a) und gegebenenfalls (b) weiterhin 0,1 bis 97 Gew.-%, insbesondere 30 bis 97 Gew.-%, vor allem 50 bis 97 Gew.-%, eines oder mehrerer Polyglykolether und/oder deren Borsäureester. Geeignete Polyglykolether sind hierbei vor allem Ethylenglykolmo- noalkylether mit bis zu 6 Ethylenoxid-Einheiten und mit bis zu 4 Kohlenstoffatomen im Alkylrest, wie zum Beispiel Methyldiglykol , Methyltriglykol, Butyltriglykol oder Methyltetraglykol . Weiterhin kommen Ethylenglykol- oder Propylenglykoldialkylether mit bis zu 6 Alkylenoxid-Einheiten und mit jeweils bis zu 4 Kohlenstoff - atomen in den Alkylresten in Betracht, wie zum Beispiel Triethy- lenglykol-dimethylether, Tetraethylenglykol-dimethylether, Die- thylenglykol-di-tert.-butylether, Diethylenglykol-dibutylether, Butyldiglykol-tert.-butylether oder Dipropylenglykol-dimethyle- ther.In a preferred embodiment, the brake fluids for motor vehicles according to the invention contain, in addition to components (a) and optionally (b), 0.1 to 97% by weight, in particular 30 to 97% by weight, especially 50 to 97% by weight , one or more polyglycol ethers and / or their boric acid esters. Suitable polyglycol ethers are above all ethylene glycol monoalkyl ethers with up to 6 ethylene oxide units and with up to 4 carbon atoms in the alkyl radical, such as, for example, methyldiglycol, methyltriglycol, butyltriglycol or methyltetraglycol. Also suitable are ethylene glycol or propylene glycol dialkyl ethers with up to 6 alkylene oxide units and each with up to 4 carbon atoms in the alkyl radicals, such as, for example, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, diethylene glycol di-tert.- butyl ether, diethylene glycol dibutyl ether, butyl diglycol tert-butyl ether or dipropylene glycol dimethyl ether.
Geeignete Borsäureester der genannten oder von anderen Polyglyko- lethern sind insbesondere in den Schriften EP-B 013 925 (cycli- sehe Bis-borsäureester) , DE-C 28 04 535 (stickstoffhaltige Borsäureester) , DE-A 24 38 038 (Borsäure-Alkylenglykol-Monoalkyle- ther-Ester) und DE-B 17 68 933 (Borsäure-tris-alkoxyalkylester) beschrieben.Suitable boric acid esters of said polyglycol ethers or of other polyglycol ethers are described in particular in documents EP-B 013 925 (cyclic bis-boric acid esters), DE-C 28 04 535 (nitrogen-containing boric acid esters), DE-A 24 38 038 (boric acid-alkylene glycol) Monoalkyl ether esters) and DE-B 17 68 933 (tris-alkoxyalkyl borate).
Anstelle der genannten Polyglykolether und/oder deren Borsäureester können die erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge als Hauptkomponente auch solche auf Basis von Carbon- säureestern, Mineralölen oder Silikonölen enthalten.Instead of the polyglycol ethers mentioned and / or their boric acid esters, the brake fluids according to the invention for motor vehicles can also contain, as the main component, those based on carboxylic acid esters, mineral oils or silicone oils.
Die erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge enthalten in einer weiteren bevorzugten Ausführungsform neben den Komponenten (a) und gegebenenfalls (b) weiterhin 0,1 bis 50 Gew.-%, insbesondere 1 bis 40 Gew.-%, vor allem 5 bis 30 Gew.-%, eines oder mehrerer Polyglykole.In a further preferred embodiment, the brake fluids for motor vehicles according to the invention contain, in addition to components (a) and optionally (b), 0.1 to 50% by weight, in particular 1 to 40% by weight, especially 5 to 30% by weight. %, one or more polyglycols.
Geeignete Polyglykole sind hierbei vor allem höhersiedende Umsetzungsprodukte von Ethylenoxid und/oder Propylenoxid und/oder Butylenoxid mit Wasser oder Diolen, insbesondere finden entsprechende Umsetzungsprodukte von Gemischen aus Ethylenoxid und Propylenoxid mit Wasser Verwendung. Die Anzahl der Alkylenoxid- Einheiten in solchen Polyglykolen beträgt normalerweise 2 bis 10.Suitable polyglycols are, above all, higher-boiling reaction products of ethylene oxide and / or propylene oxide and / or butylene oxide with water or diols; in particular, corresponding reaction products of mixtures of ethylene oxide and propylene oxide with water are used. The number of alkylene oxide units in such polyglycols is usually 2 to 10.
Die Wirkung dieser hochsiedenden Polyglykole ist die eines Schmiermittels, was im wesentlichen auf eine Verbesserung des Temperatur-Viskositäts-Verhaltens zurückzuführen ist. Die Polyglykole verleihen den dünnflüssigen Polyglykole hern bei hohen Temperaturen genügend Viskosität und sorgen damit für eine ausreichende Schmierung. Eine genügende Schmierung ist deshalb in den Bauteilen des Kraftfahrzeug-BremsSystems notwendig, da dort Gummi oder Elastomere auf Metall möglichst verschleißfrei gleiten müssen. Weitere Komponenten und Hilfsmittel in den erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge können übliche Anti- oxidationsmittel wie z.B. Phenothiazin und/oder solche auf Phenolbasis, und übliche Entschäumer sein.The effect of these high-boiling polyglycols is that of a lubricant, which is essentially due to an improvement in the temperature-viscosity behavior. The polyglycols give the thin-bodied polyglycols sufficient viscosity at high temperatures and thus ensure adequate lubrication. Sufficient lubrication is therefore necessary in the components of the motor vehicle brake system, since rubber or elastomers on metal have to slide as wear-free as possible. Further components and auxiliaries in the brake fluids for motor vehicles according to the invention can be customary antioxidants, such as phenothiazine and / or those based on phenol, and customary defoamers.
Außerdem können die erfindungsgemäßen Bremsflüssigkeiten die in WO 00/65001 aufgeführten cyclischen Carbonsäurederivate enthalten, welche als Komponenten zur Erniedrigung der Tieftemperatur- viskosität in Anwesenheit von Wasser geeignet sind.In addition, the brake fluids according to the invention can contain the cyclic carboxylic acid derivatives listed in WO 00/65001, which are suitable as components for lowering the low-temperature viscosity in the presence of water.
Das Vorliegen der genannten geringen Menge an 1H-1, 2 , 4-Triazol sorgt in hervorragender Weise dafür, daß die erfindungsgemäßen hydraulischen Flüssigkeiten bzw. Bremsflüssigkeiten für Kraftfahrzeuge den eingangs genannten Anforderungen gerecht werden und daß insbesondere ein gegenüber dem Stand der Technik generell gutes Korrosionsverhalten, d.h. ein verbesserter Korrosionsschutz bei Metallen wie Eisen, Stahl, Weißblech, Gußeisen (Grauguß) , Blei, Zinn, Chrom, Zink, Aluminium, Magnesium und deren Legierungen und bei Lötmetallen, beispielsweise Lötzinn, sowie bei Bunt- metallen wie Kupfer und deren Legierungen, beispielsweise Messing, bewirkt wird.The presence of the small amount of 1H-1, 2, 4-triazole mentioned ensures in an excellent manner that the hydraulic fluids or brake fluids for motor vehicles according to the invention meet the requirements mentioned at the outset and that, in particular, a generally good corrosion behavior compared to the prior art , ie improved corrosion protection for metals such as iron, steel, tinplate, cast iron (gray cast iron), lead, tin, chromium, zinc, aluminum, magnesium and their alloys and for soldering metals, for example solder, and for non-ferrous metals such as copper and their alloys, for example Brass.
Weitere Vorteile der erfindungsgemäßen hydraulischen Flüssigkeiten bzw. Bremsflüssigkeiten für Kraftfahrzeuge sind deren gün- stige Tieftemperaturviskosität, eine gute Wasserverträglichkeit, ein schonender pH-Wert, eine gute Kälte-, Hochtemperatur- und Oxidationsstabilität sowie eine gute chemische Stabilität, eine günstiges Verhalten (d.h. eine gute Verträglichkeit) gegenüber Werkstoffen wie Kautschuken, Kunststoffen, Leimfugen, Fiber-, Elastomeren- und Gummidichtungen und ähnlichen Materialien sowie ein gutes Schmierverhalten.Further advantages of the hydraulic fluids or brake fluids for motor vehicles according to the invention are their favorable low-temperature viscosity, good water compatibility, a gentle pH value, good low-temperature, high-temperature and oxidation stability as well as good chemical stability, favorable behavior (ie good behavior) Compatibility) with materials such as rubbers, plastics, glue joints, fiber, elastomer and rubber seals and similar materials as well as good lubrication behavior.
Nicht zuletzt ist der Einsatz einer nur geringen Menge an lH-l,2,4-Triazol in den erfindungsgemäßen hydraulischen Flüssig- keiten bzw. Bremsflüssigkeiten für Kraftfahrzeuge sowohl ökonomisch als auch ökologisch vorteilhaft.Last but not least, the use of only a small amount of 1H-1,2,4-triazole in the hydraulic fluids or brake fluids according to the invention for motor vehicles is both economically and ecologically advantageous.
Die nachfolgenden Beispiele sollen die vorliegende Erfindung erläutern, ohne sie zu beschränken.The following examples are intended to illustrate the present invention without restricting it.
Anwendungstechnische BeispieleApplication engineering examples
Basierend auf den marktüblichen DOT 4- bzw. DOT 5.1-Bremsflüssig- keiten BF 1 (ERBP: 267°C, wet ERBP: 173°C, kinematische Viskosität bei -40°C: 676 cSt) und BF 2 (ERBP: 263°C, wet ERBP: 181°C, kinematische Viskosität bei -40°C: 850 cSt) mit jeweils 0,05 Gew.-% lH-l,2,3-Tolutriazol als Buntmetallkorrosionsinhibitor wurden im Vergleich dazu die erfindungsgemäßen Bremsflüssigkeiten BF la, BF lb, BF lc und BF 2a geprüft.Based on the standard DOT 4 or DOT 5.1 brake fluids BF 1 (ERBP: 267 ° C, wet ERBP: 173 ° C, kinematic viscosity at -40 ° C: 676 cSt) and BF 2 (ERBP: 263 ° C, wet ERBP: 181 ° C, kinematic viscosity at -40 ° C: 850 cSt) with 0.05 wt .-% lH-l, 2,3-tolutriazole as a non-ferrous metal corrosion inhibitor In comparison, the brake fluids BF la, BF lb, BF lc and BF 2a tested according to the invention.
Die verwendeten Kraftfahrzeug-Bremsflüssigkeiten hatten folgende Zusammensetzungen:The motor vehicle brake fluids used had the following compositions:
BF 1:BF 1:
55,00 Gew.-% Methyltriglykol-borat, 43,44 Gew.-% Mischung aus Methyltriglykol, Methyltetraglykol, Bu- tyltriglykol und Methyldiglykol, 1,51 Gew.-% Mischung aus 1, 1' -Iminodipropan-2-ol, Phenothiazin und einem Phosphorsäurester 0,05 Gew.-% lH-l,2,3-Tolutriazol55.00% by weight of methyltriglycol-borate, 43.44% by weight of a mixture of methyltriglycol, methyltetraglycol, butyltriglycol and methyldiglycol, 1.51% by weight of a mixture of 1,1'-iminodipropan-2-ol, Phenothiazine and a phosphoric acid ester 0.05 wt .-% lH-l, 2,3-tolutriazole
BF 2:BF 2:
68,00 Gew.-% Methyltriglykol-borat,68.00% by weight of methyl triglycol borate,
28,84 Gew.-% Mischung aus Methyltriglykol, Methyldiglykol, Butyl- diglykol und Diglykol,28.84% by weight mixture of methyl triglycol, methyl diglycol, butyl diglycol and diglycol,
3,11 Gew.-% Mischung aus 1, l'-Iminodipropan-2-ol, Hydroxyanisol und einem Phosphonsäurederivat 0,05 Gew.-% lH-l,2,3-Tolutriazol.3.11% by weight mixture of 1, l'-iminodipropan-2-ol, hydroxyanisole and a phosphonic acid derivative 0.05% by weight lH-l, 2,3-tolutriazole.
Die erfindungsgemäßen Bremsflüssigkeiten BF la und BF 2a unterschieden sich von BF 1 und BF 2 nur dadurch, daß sie anstelle von 0,05 Gew.-% lH-l,2,3-Tolutriazol die gleiche Menge an 1H-1, 2,4-Triazol enthielten; die erfindungsgemäße Bremsflüssigkeit BF lb enthielt anstelle von 0,05 Gew.-% 1H-1, 2, 3-Tolutriazol 0,04 Gew.-% 1H-1, 2, 4-Triazol und 0,01 Gew.-% Adenin; die erfindungsgemäße Bremsflüssigkeit BF lc enthielt anstelle von 0,05 Gew.-% lH-l,2,3-Tolutriazol 0,07 Gew.-% 1H-1, 2, 4-Triazol (dafür jedoch nur 54,98 Gew.-% Methyltriglykol-borat).The brake fluids BF la and BF 2a according to the invention differ from BF 1 and BF 2 only in that instead of 0.05% by weight 1H-l, 2,3-tolutriazole they contain the same amount of 1H-1, 2,4 -Triazole contained; the brake fluid BF 1b according to the invention contained 0.04% by weight of 1H-1, 2, 4-triazole and 0.01% by weight of adenine instead of 0.05% by weight of 1H-1, 2, 3-tolutriazole; The brake fluid BF 1c according to the invention contained 0.07% by weight of 1H-1, 2, 4-triazole instead of 0.05% by weight of 1H-l, 2,3-tolutriazole (but only 54.98% by weight for this) % Methyl triglycol borate).
Die anwendungstechnischen Untersuchungen wurden gemäß dem Kupfer- korrosionstest PSA D 53 5387 in der Version des Jahres 2000 der Firma PSA Peugeot-Citroen durchgeführt. Hierbei wird zuerst ein zuvor in Aceton gereinigtes Kupferblech mit einer Gesamtfläche von 1000 cm2 (Abmessungen: 71,4 cm x 7 cm x 0,05 cm) in Form eines Rundzylinders schneckenförmig so aufgerollt, daß sich die Metall - fläche im Inneren nicht berührt. Das Kupferblech wird in eine Mischung aus 294 ml Bremsflüssigkeit mit 6 ml destilliertem Wasser gestellt und für 100 Stunden auf 100°C erhitzt; durch die Flüssigkeit werden pro Stunde 10 Liter Luft geleitet, die zuvor durch auf 2°C gekühltes destilliertes Wasser geleitet wurde. Nach dem Test wird das Aussehen des wieder aufgerollten Kupferbleches und das Aussehen der Flüssigkeit optisch beurteilt und der Kupfergehalt der Flüssigkeit ermittelt.The application tests were carried out in accordance with the copper corrosion test PSA D 53 5387 in the version of the year 2000 from the company PSA Peugeot-Citroen. First, a copper sheet with a total area of 1000 cm2 (dimensions: 71.4 cm x 7 cm x 0.05 cm) previously cleaned in acetone is rolled up in a spiral shape in the form of a round cylinder so that the metal surface inside does not touch. The copper sheet is placed in a mixture of 294 ml of brake fluid with 6 ml of distilled water and heated to 100 ° C. for 100 hours; 10 liters of air are passed through the liquid per hour, which was previously passed through distilled water cooled to 2 ° C. After the test, the appearance of the re-rolled copper sheet and optically assessed the appearance of the liquid and determined the copper content of the liquid.
Die Ergebnisse nach dem beschriebenen Test sind der nachfolgenden Tabelle 1 zu entnehmen.The results after the test described are shown in Table 1 below.
Tabelle 1:Table 1:
Es wird ersichtlich, daß die erfindungsgemäßen Formulierungen im Gegensatz zu herkömmlichen Bremsflüssigkeiten wie BF 1 und BF 2 nicht nur einen sehr guten Kupferkorrosionsschutz mit geringem Cu-Gehalt in der Testflüssigkeit bieten, sondern zusätzlich auch eine belagfreie Metalloberfläche und keine Sedimentbildung in der Bremsflüssigkeit bewirken.It can be seen that, in contrast to conventional brake fluids such as BF 1 and BF 2, the formulations according to the invention not only offer very good copper corrosion protection with a low Cu content in the test fluid, but also additionally cause a deposit-free metal surface and no sediment formation in the brake fluid.
Die nachfolgend aufgeführten Ergebnisse im Korrosionstest gemäß SAE J 1704 (Jan. 97) belegen außerdem, daß erfindungsmäße Brems¬ flüssigkeiten wie BF 2a mit einem niedrigen 1H-1, 2, 4-Triazol-Ge- halt im Vergleich zu nicht erfindungsgemäßen Formulierungen wie BF ld mit einem hohen lH-l,2,4-Triazol-Gehalt Vorteile bieten, da sie bei Kupfer ein besseres Korrosionsergebnis zeigen (BF ld ent¬ sprach BF 1, enthielt anstelle von 1H-1, 2, 3-Tolutriazol jedoch 0,20 Gew.-% lH-l,2,4-Triazol und nur 54,85 Gew.-% Methyltriglykol-borat) :The results listed below in the corrosion test according to SAE J 1704 (Jan. 97) also prove that brake fluids according to the invention such as BF 2a with a low 1H-1, 2, 4-triazole content compared to formulations according to the invention such as BF ld triazole-2,4-content offer advantages with a high lH-l, as they reach a better copper corrosion result show (BF ld ent ¬ said BF 1, containing instead of 1H-1, 2, 3-tolutriazole However 0, 20% by weight lH-l, 2,4-triazole and only 54.85% by weight methyltriglycol-borate):
Die Ergebnisse nach dem Korrosionstest gemäß SAE J 1704 (Jan. 97) sind der nachfolgenden Tabelle 2 zu entnehmen. Tabelle 2:The results after the corrosion test according to SAE J 1704 (Jan. 97) are shown in Table 2 below. Table 2:

Claims

Patentansprüche claims
1. Hydraulische Flüssigkeiten mit verbessertem Korrosionsschutz, enthaltend1. Containing hydraulic fluids with improved corrosion protection
(a) 0,005 bis 0,125 Gew.-% 1H-1, 2, 4-Triazol und(a) 0.005 to 0.125 wt% 1H-1,2,4-triazole and
(b) 0 bis 10 Gew.-% eines oder mehrerer weiterer Korrosions - inhibitoren, wobei bei Mitverwendung von 1H-1, 2, 3-Benzo- triazol und/oder 1H-1, 2, 3-Tolutriazol und/oder deren Derivaten das Gew. -Verhältnis von 1H-1, 2, 4-Triazol zu den genannten 1H-1, 2, 3-Triazolen größer als 4:1 sein muß.(b) 0 to 10% by weight of one or more further corrosion inhibitors, with the use of 1H-1, 2, 3-benzotriazole and / or 1H-1, 2, 3-tolutriazole and / or their derivatives the weight ratio of 1H-1, 2, 4-triazole to said 1H-1, 2, 3-triazoles must be greater than 4: 1.
2. Hydraulische Flüssigkeiten nach Anspruch 1, enthaltend 0,005 bis 0,08 Gew.-% der Komponente (a) .2. Hydraulic liquids according to claim 1, containing 0.005 to 0.08% by weight of component (a).
3. Hydraulische Flüssigkeiten nach Anspruch 1 oder 2, enthaltend die Komponente (a) als alleinigen Korrosionsinhibitor auf Triazol-Basis.3. Hydraulic liquids according to claim 1 or 2, containing component (a) as the sole corrosion inhibitor based on triazole.
4. Hydraulische Flüssigkeiten nach Anspruch 1 oder 2, enthaltend als Komponente (b) 0,001 bis 0,5 Gew.- einer oder mehrerer Verbindungen aus der Gruppe Benzimidazol, hydriertes 1H-1, 2, 3-Tolutriazol, Purin, Adenin, 6-Chloropurin, 2,6-Dich- loropurin, 6-Methoxypurin, 1H-1, 2, 3-Triazolo (4, 5B)pyryidin, 6-His aminopurin* und 6-Furfurylaminopurin und gegebenenfalls weitere von (a) verschiedene Korrosionsinhibitoren.4. Hydraulic liquids according to claim 1 or 2, containing as component (b) 0.001 to 0.5% by weight of one or more compounds from the group benzimidazole, hydrogenated 1H-1, 2, 3-tolutriazole, purine, adenine, 6- Chloropurine, 2,6-dichloropurine, 6-methoxypurine, 1H-1, 2, 3-triazolo (4, 5B) pyryidine, 6-His aminopurine * and 6-furfurylaminopurine and optionally other corrosion inhibitors different from (a).
5. Bremsflüssigkeiten für Kraftfahrzeuge, enthaltend als Korrosionsinhibitoren die Komponenten (a) und gegebenenfalls (b) gemäß den Ansprüchen 1 bis 4.5. Brake fluids for motor vehicles, containing components (a) and optionally (b) according to claims 1 to 4 as corrosion inhibitors.
6. Bremsflüssigkeiten für Kraftfahrzeuge nach Anspruch 5, ent- haltend neben den Komponenten (a) und gegebenenfalls (b) weiterhin 0,1 bis 97 Gew.-% eines oder mehrerer Polyglykolether und/oder deren Borsäureester.6. Brake fluids for motor vehicles according to claim 5, containing in addition to components (a) and optionally (b), further 0.1 to 97% by weight of one or more polyglycol ethers and / or their boric acid esters.
7. Bremsflüssigkeiten für Kraftfahrzeuge nach Anspruch 5 oder 6, enthaltend neben den Komponenten (a) und gegebenenfalls (b) weiterhin 0,1 bis 50 Gew.-% eines oder mehrerer Polyglykole. 7. Brake fluids for motor vehicles according to claim 5 or 6, containing in addition to components (a) and optionally (b) further 0.1 to 50 wt .-% of one or more polyglycols.
EP02759789A 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties Expired - Lifetime EP1379615B1 (en)

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