DE10117647A1 - Hydraulic fluids with improved corrosion protection - Google Patents

Hydraulic fluids with improved corrosion protection

Info

Publication number
DE10117647A1
DE10117647A1 DE10117647A DE10117647A DE10117647A1 DE 10117647 A1 DE10117647 A1 DE 10117647A1 DE 10117647 A DE10117647 A DE 10117647A DE 10117647 A DE10117647 A DE 10117647A DE 10117647 A1 DE10117647 A1 DE 10117647A1
Authority
DE
Germany
Prior art keywords
weight
fluids
triazole
motor vehicles
hydraulic
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.)
Withdrawn
Application number
DE10117647A
Other languages
German (de)
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
Priority to DE10117647A priority Critical patent/DE10117647A1/en
Priority to AU2002308121A priority patent/AU2002308121B2/en
Priority to ARP020101223A priority patent/AR033453A1/en
Priority to CA2442697A priority patent/CA2442697C/en
Priority to CNB028079027A priority patent/CN1312261C/en
Priority to HU0303757A priority patent/HUP0303757A2/en
Priority to US10/469,770 priority patent/US20040116306A1/en
Priority to MXPA03007944A priority patent/MXPA03007944A/en
Priority to JP2002579971A priority patent/JP4116445B2/en
Priority to SK1192-2003A priority patent/SK286828B6/en
Priority to PT02759789T priority patent/PT1379615E/en
Priority to KR1020037013131A priority patent/KR100861969B1/en
Priority to BR0208415-5A priority patent/BR0208415A/en
Priority to PL367159A priority patent/PL197796B1/en
Priority to ES02759789T priority patent/ES2235077T3/en
Priority to DE50201902T priority patent/DE50201902D1/en
Priority to EP02759789A priority patent/EP1379615B1/en
Priority to CZ20032736A priority patent/CZ299651B6/en
Priority to PCT/EP2002/003671 priority patent/WO2002081604A1/en
Priority to AT02759789T priority patent/ATE286112T1/en
Publication of DE10117647A1 publication Critical patent/DE10117647A1/en
Priority to NO20034495A priority patent/NO325635B1/en
Priority to ZA200308690A priority patent/ZA200308690B/en
Withdrawn 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
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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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    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
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    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • 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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    • C10M2223/061—Metal salts
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    • 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
    • C10M2223/065—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds containing sulfur
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Braking Arrangements (AREA)

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

Die vorliegende Erfindung betrifft hydraulische Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, mit verbes­ sertem Korrosionsschutz, welche
The 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 unda) 0.005 to 0.125% by weight of 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 bittern, with the use of 1H-1,2,3-benzotriazole and / or 1H-1,2,3-tolutriazole and / or their derivatives Weight ratio of 1H-1,2,4-triazole to the above 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. Ent­ sprechend der bestehenden Normen und Spezifikationen für Brems­ flüssigkeiten vom US-Department of Transportation im Federal Mo­ tor Vehicle Safety Standard FMVSS-Nr. 116 und der von der Society of Automotive Engineers herausgegebenen Norm SAE 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 their chemical and physical properties very high requirements. Ent speaking of the existing norms and specifications for brakes liquids from the U.S. Department of Transportation in Federal Mo tor Vehicle Safety Standard FMVSS no. 116 and that of the Society of Automotive Engineers published standard SAE J 1704 modern brake fluids on the one hand have high dry boiling points (Reflux boiling points, dry [Equilibrium reflux boiling point, "ERBP"]) and high wet boiling points (reflux boiling points, moist ["wet ERBP"]), but also a viscosity have, which are within a wide temperature range little changes.

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 circle the automotive industry for improved corrosion protection for metals and non-ferrous metals. Corrosion inhibitors have in Brake fluids the job caused by corrosion Prevent destruction of metallic materials.

Der Einsatz von 1H-1,2,3-Triazolen wie 1H-1,2,3-Benztriazol oder 1H-1,2,3-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 Liquids or brake fluids have 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 Deri­ vaten 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 Korrosionsinhi­ bitorsystem enthalten. Zu Vergleichszwecken werden in Tabelle 1 bis 4 von (3) auch Hydraulikflüssigkeiten angegeben, die 1H-1,2,4-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 is a combination of 1H-1,2,3-benzotriazole or its deri such as 1H-1,2,3-tolutriazuol and 1H-1,2,4-triazole or its  Derivatives in a weight ratio of 1: 4 to 4: 1 as corrosion inhibitors bitor system included. For comparison purposes, Table 1 to 4 of (3) also specified hydraulic fluids that 1H-1,2,4-triazole alone in concentrations of 0.15% by weight hold; However, their corrosion-preventing effect is only at Copper acceptable.

Die im Stand der Technik bekannten hydraulischen Flüssigkeiten und Bremsflüssigkeiten für Kraftfahrzeuge sind in Hinblick auf ihre Eigenschaften und insbesondere auf den Korrosionsschutz je­ doch 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 known in the prior art and brake fluids for automobiles are in view their properties and in particular depending on the corrosion protection but still in need of improvement. It was therefore the task to provide hydraulic fluids, which in particular the above requirements for an improved Corrosion protection for metals and non-ferrous metals.

Demgemäß wurden die eingangs definierten hydraulischen oder kraftübertragenden Flüssigkeiten gefunden.Accordingly, the hydraulic or power transmission fluids found.

Die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, enthalten vorzugsweise 0,005 bis 0,10 Gew.-%, vorzugsweise 0,005 bis 0,08 Gew.-%, ins­ besondere 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, ins particularly 0.005 to 0.06% by weight of component (a).

Die erfindungsgemäßen hydraulischen Flüssigkeiten, insbesondere Bremsflüssigkeiten für Kraftfahrzeuge, enthalten in einer bevor­ zugten Ausführungsform die Komponente (a) als alleinigen Korro­ sionsinhibitor auf Triazol-Basis. Damit ist gemeint, daß Triazole wie 1H-1,2,3-Benzotriazol, 1H-1,2,3-Tolutriazol oder hydriertes 1H-1,2,3-Tolutriazol hierbei ausgeschlossen werden, anorganische und/oder organische Korrosionsinhibitoren anderer Struktur können jedoch anwesend sein.The hydraulic fluids according to the invention, in particular Brake fluids for motor vehicles contained in a before preferred embodiment, component (a) as the sole corro ion 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 can be excluded here, inorganic and / or organic corrosion inhibitors of other structures 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 1H-1,2,3-Triazolen größer als 4 : 1 sein muß.In another preferred embodiment, the hydraulic fluids according to the invention, in particular Brake fluids for motor vehicles, up to 10% by weight, in particular up to 5% by weight of one or more further corro sionsinhibitoren (b), with the use of 1H-1,2,3-benzo triazole and / or 1H-1,2,3-tolutriazole and / or their derivatives the weight ratio of 1H-1,2,4-triazole to the above 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, Fett­ säuren wie Capryl-, Laurin-, Palmitin-, Stearin- oder Ölsäure so­ wie deren Alkalimetallsalze, Ester der Phosphorsäure und der phosphorigen Säure wie Ethylphosphat, Dimethylphosphat, Isopro­ pylphosphat, Diisopropylphosphat, Butylphosphit oder Dimethylphosphit, 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, Benz­ imidazol und hydriertes Tolutriazol sowie Nitroaromaten, z. B. 3-Nitrobenzaldehyd, in Betracht.Above all, there are other corrosion inhibitors (b) Alkali metal salts of phosphoric acid and phosphorous acid, fat acids such as caprylic, lauric, palmitic, stearic or oleic acid such as their alkali metal salts, esters of phosphoric acid and the phosphorous acid such as ethyl phosphate, dimethyl phosphate, isopro pyl phosphate, diisopropyl phosphate, butyl phosphite or dimethyl phosphite,  optionally ethoxylated mono- and dialkylamines and whose salts with mineral and fatty acids, e.g. B. butylamine, hexyl amine, octylamine, isononylamine, oleylamine, dipropylamine, diiso propylamine or dibutylamine, optionally ethoxylated alkanol amines, e.g. B. mono-, di- or triethanolamine, N, N'-di-n-butylami noethanol or 1,1'-iminodipropan-2-ol, cyclohexylamine, benz imidazole and hydrogenated tolutriazole and nitroaromatics, e.g. B. 3-nitrobenzaldehyde.

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, ins­ besondere Bremsflüssigkeiten für Kraftfahrzeuge, vor.The corrosion inhibitors (b) mentioned are preferably 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, ins special 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-To­ lutriazol, 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) verschie­ dene Korrosionsinhibitoren. Die genannten Purin-Derivate werden als Buntmetall-Korrosionsinhibitoren für hydraulische Flüssigkei­ ten 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, in addition to 1H-1,2,4-triazole (a) as additional corrosion inhibitors (b) 0.001 to 5% by weight, in particular 0.001 to 0.5% by weight, one or more Compounds from the group benzimidazole, hydrogenated 1H-1,2,3-To lutriazole, purine, adenine, 6-chloropurine, 2,6-dichloropurine, 6-me thoxypurine, 1H-1,2,3-triazolo (4,5B) pyridine, 6-histaminopurine and 6-furfurylaminopurine and optionally other from (a) their corrosion inhibitors. The purine derivatives mentioned are as non-ferrous metal corrosion inhibitors for hydraulic fluids ten or brake fluids in the 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. Brems­ flüssigkeiten addiert sich jeweils auf 100 Gew.-%.All of the above and following% by weight data relate to the total amount of hydraulic fluid or the brake fluid unless otherwise stated. The Sum of all components listed above and below for the hydraulic fluids or brakes according to the invention liquids add up to 100% by weight.

Gegenstand der vorliegenden Erfindung sind insbesondere Brems­ flüssigkeiten für Kraftfahrzeuge, die als Korrosionsinhibitoren die genannten Komponenten (a) und gegebenenfalls (b) enthalten.The present invention relates in particular to brakes Automotive fluids used as corrosion inhibitors contain said components (a) and optionally (b).

Die erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge ent­ halten in einer bevorzugten Ausführungsform neben den Komponenten (a) und gegebenenfalls (b) weiterhin 0,1 bis 97 Gew.-%, ins­ besondere 30 bis 97 Gew.-%, vor allem 50 bis 97 Gew.-%, eines oder mehrerer Polyglykolether und/oder deren Borsäureester. The brake fluids for motor vehicles according to the invention ent hold next to the components in a preferred embodiment (a) and optionally (b) further 0.1 to 97 wt .-%, ins particularly 30 to 97% by weight, especially 50 to 97% by weight, of one or several polyglycol ethers and / or their boric acid esters.  

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.Suitable polyglycol ethers are especially ethylene glycol mo noalkyl ether with up to 6 ethylene oxide units and with up to 4 Carbon atoms in the alkyl radical, such as methyl diglycol, Methyl triglycol, butyl triglycol or methyl tetraglycol. Farther come with up to ethylene glycol or propylene glycol dialkyl ether 6 alkylene oxide units and each with up to 4 carbon atoms in the alkyl radicals, such as Triethy lenglycol dimethyl ether, tetraethylene glycol dimethyl ether, the ethylene glycol di-tert-butyl ether, diethylene glycol dibutyl ether, Butyl diglycol tert-butyl ether or dipropylene glycol dimethyl ther.

Geeignete Borsäureester der genannten oder von anderen Polyglyko­ lethern sind insbesondere in den Schriften EP-B 013 925 (cycli­ sche Bis-borsäureester), DE-C 28 04 535 (stickstoffhaltige Bor­ säureester), 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 or other polyglyko Ethers are particularly described in the documents EP-B 013 925 (cycli Sche bis-boric acid ester), DE-C 28 04 535 (nitrogen-containing boron acid esters), DE-A 24 38 038 (boric acid-alkylene glycol monoalkyls ther esters) and DE-B 17 68 933 (tris-alkoxyalkyl borate) described.

Anstelle der genannten Polyglykolether und/oder deren Borsäuree­ ster können die erfindungsgemäßen Bremsflüssigkeiten für Kraft­ fahrzeuge als Hauptkomponente auch solche auf Basis von Carbon­ säureestern, Mineralölen oder Silikonölen enthalten.Instead of the polyglycol ethers and / or their boric acids mentioned ster can brake fluids for power according to the invention vehicles as the main component, including those based on carbon contain acid esters, mineral oils or silicone oils.

Die erfindungsgemäßen Bremsflüssigkeiten für Kraftfahrzeuge ent­ halten 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.The brake fluids for motor vehicles according to the invention ent hold in a further preferred embodiment in addition to the Components (a) and optionally (b) further 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 Umset­ zungsprodukte von Ethylenoxid und/oder Propylenoxid und/oder Butylenoxid mit Wasser oder Diolen, insbesondere finden ent­ sprechende 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 conversion tion products of ethylene oxide and / or propylene oxide and / or Butylene oxide with water or diols, in particular, find ent Talking reaction products of mixtures of ethylene oxide and Propylene oxide with water use. The number of alkylene oxide Units in such polyglycols are 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 Poly­ glykole verleihen den dünnflüssigen Polyglykolethern bei hohen Temperaturen genügend Viskosität und sorgen damit für eine aus­ reichende Schmierung. Eine genügende Schmierung ist deshalb in den Bauteilen des Kraftfahrzeug-Bremssystems notwendig, da dort Gummi oder Elastomere auf Metall möglichst verschleißfrei gleiten müssen. The effect of these high-boiling polyglycols is one Lubricant, which essentially indicates an improvement in the Temperature-viscosity behavior is attributable. The poly Glycols give the thin polyglycol ethers at high Temperatures enough viscosity and thus ensure a adequate lubrication. Sufficient lubrication is therefore in the components of the motor vehicle brake system necessary because there Glide rubber or elastomers on metal as wear-free as possible have to.  

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.Other components and auxiliaries in the invention Brake fluids for motor vehicles can be common anti oxidizing agents such as B. phenothiazine and / or such Phenol base, and usual defoamers.

Außerdem können die erfindungsgemäßen Bremsflüssigkeiten die in WO 00/65001 aufgeführten cyclischen Carbonsäurederivate enthal­ ten, welche als Komponenten zur Erniedrigung der Tieftemperatur­ viskosität in Anwesenheit von Wasser geeignet sind.In addition, the brake fluids of the invention WO 00/65001 listed cyclic carboxylic acid derivatives contain ten, which as components for lowering the low temperature viscosity in the presence of water are suitable.

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 Kraft­ fahrzeuge den eingangs genannten Anforderungen gerecht werden und daß insbesondere ein gegenüber dem Stand der Technik generell gu­ tes Korrosionsverhalten, d. h. ein verbesserter Korrosionsschutz bei Metallen wie Eisen, Stahl, Weißblech, Gußeisen (Grauguß), Blei, Zinn, Chrom, Zink, Aluminium, Magnesium und deren Legierun­ gen und bei Lötmetallen, beispielsweise Lötzinn, sowie bei Bunt­ metallen wie Kupfer und deren Legierungen, beispielsweise Mes­ sing, bewirkt wird.The presence of said small amount of 1H-1,2,4-triazole ensures in an excellent manner that the invention hydraulic fluids or brake fluids for power vehicles meet the requirements mentioned at the beginning and that in particular a generally good compared to the prior art t corrosion behavior, d. H. improved corrosion protection for metals such as iron, steel, tinplate, cast iron (gray cast iron), Lead, tin, chrome, zinc, aluminum, magnesium and their alloys gene and with solder metals, for example solder, as well as with colored metals such as copper and their alloys, for example mes sing, is effected.

Weitere Vorteile der erfindungsgemäßen hydraulischen Flüssigkei­ ten 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 fluid according to the invention Brake fluids for motor vehicles are their gün constant low temperature viscosity, good water compatibility, a gentle pH value, a good cold, high temperature and Oxidation stability as well as good chemical stability, a favorable behavior (i.e. good tolerance) towards Materials such as rubbers, plastics, glue joints, fiber, Elastomer and rubber seals and similar materials as well good lubrication behavior.

Nicht zuletzt ist der Einsatz einer nur geringen Menge an 1H-1,2,4-Triazol in den erfindungsgemäßen hydraulischen Flüssig­ keiten bzw. Bremsflüssigkeiten für Kraftfahrzeuge sowohl ökono­ misch als auch ökologisch vorteilhaft.Last but not least is the use of only a small amount 1H-1,2,4-triazole in the hydraulic fluid according to the invention or brake fluids for motor vehicles both economically mixed as well as ecologically advantageous.

Die nachfolgenden Beispiele sollen die vorliegende Erfindung er­ läutern, ohne sie zu beschränken.The following examples are intended to illustrate the present invention refine without restricting them.

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, kine­ matische Viskosität bei -40°C: 850 cSt) mit jeweils 0,05 Gew.-% 1H-1,2,3-Tolutriazol als Buntmetallkorrosionsinhibitor wurden im Vergleich dazu die erfindungsgemäßen Bremsflüssigkeiten BF 1a, BF 1b, BF 1c und BF 2a geprüft.Based on the commercially available DOT 4 or DOT 5.1 brake fluid 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, kine Matic viscosity at -40 ° C: 850 cSt) with 0.05% by weight each 1H-1,2,3-tolutriazole as a non-ferrous metal corrosion inhibitor was used in  Comparison with the brake fluids BF 1a, BF according to the invention 1b, BF 1c and BF 2a checked.

Die verwendeten Kraftfahrzeug-Bremsflüssigkeiten hatten folgende Zusammensetzungen:
The motor vehicle brake fluids used had the following compositions:

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.-% 1H-1,2,3-Tolutriazol
BF 1:
55.00% by weight of methyl triglycol borate,
43.44% by weight mixture of methyltriglycol, methyltetraglycol, butyltriglycol and methyldiglycol,
1.51% by weight mixture of 1,1'-iminodipropan-2-ol, phenothiazine and a phosphoric acid ester
0.05 wt% 1H-1,2,3-tolutriazole

BF 2:
68,00 Gew.-% Methyltriglykol-borat,
28,84 Gew.-% Mischung aus Methyltriglykol, Methyldiglykol, Butyl­ diglykol und Diglykol,
3,11 Gew.-% Mischung aus 1,1'-Iminodipropan-2-ol, Hydroxyanisol und einem Phosphonsäurederivat
0,05 Gew.-% 1H-1,2,3-Tolutriazol.BF 2:
68.00% by weight of methyl triglycol borate,
28.84% by weight mixture of methyl triglycol, methyl diglycol, butyl diglycol and diglycol,
3.11% by weight mixture of 1,1'-iminodipropan-2-ol, hydroxyanisole and a phosphonic acid derivative
0.05% by weight of 1H-1,2,3-tolutriazole.

Die erfindungsgemäßen Bremsflüssigkeiten BF 1a und BF 2a unter­ schieden sich von BF 1 und BF 2 nur dadurch, daß sie anstelle von 0,05 Gew.-% 1H-1,2,3-Tolutriazol die gleiche Menge an 1H-1,2 4-Triazol enthielten; die erfindungsgemäße Bremsflüssig­ keit BF 1b 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 1c enthielt anstelle von 0,05 Gew.-% 1H-1,2,3-Tolutriazol 0,07 Gew.-% 1H-1,2,4-Triazol (dafür jedoch nur 54,98 Gew.-% Methyltriglykol-borat).The brake fluids BF 1a and BF 2a under differed from BF 1 and BF 2 only in that they instead of 0.05% by weight of 1H-1,2,3-tolutriazole the same amount 1H-1,2 contained 4-triazole; the brake fluid according to the invention speed BF 1b contained 1H-1,2,3-tolutriazole instead of 0.05% by weight 0.04% by weight of 1H-1,2,4-triazole and 0.01% by weight of adenine; the Brake fluid BF 1c according to the invention contained instead of 0.05 wt% 1H-1,2,3-tolutriazole 0.07 wt% 1H-1,2,4-triazole (but only 54.98% by weight of 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-Citroën durchgefuhrt. Hierbei wird zuerst ein zuvor in Aceton gereinigtes Kupferblech mit einer Gesamtfläche von 1000 cm2 (Abmessungen: 71,4 cm × 7 cm × 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 Was­ ser 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 by PSA Peugeot-Citroën. Here, a copper sheet previously cleaned in acetone with a total area of 1000 cm 2 (dimensions: 71.4 cm × 7 cm × 0.05 cm) 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 at 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 the appearance of the liquid are assessed optically and the copper content of the liquid is determined.

Die Ergebnisse nach dem beschriebenen Test sind der nachfolgenden Tabelle 1 zu entnehmen.The results after the test described are as follows Table 1.

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 the formulations according to the invention in Contrary to conventional brake fluids like BF 1 and BF 2 not just very good copper corrosion protection with little Offer Cu content in the test liquid, but also additionally a deposit-free metal surface and no sediment formation in the Cause 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 1d mit einem hohen 1H-1,2,4-Triazol-Gehalt Vorteile bieten, da sie bei Kupfer ein besseres Korrosionsergebnis zeigen (BF 1d ent­ sprach BF 1, enthielt anstelle von 1H-1,2,3-Tolutriazol jedoch 0,20 Gew.-% 1H-1,2,4-Triazol und nur 54,85 Gew.-% Methyltrigly­ kol-borat):The results listed below in the corrosion test according to SAE J 1704 (Jan. 97) also demonstrate that inventive brakes liquids like BF 2a with a low 1H-1,2,4-triazole Ge compared to formulations not according to the invention such as BF 1d with a high 1H-1,2,4-triazole content offer advantages because they show a better corrosion result with copper (BF 1d ent spoke BF 1, but contained 1H-1,2,3-tolutriazole instead 0.20% by weight of 1H-1,2,4-triazole and only 54.85% by weight of methyl trigly kol-borate):

Die Ergebnisse nach dem Korrosionstest gemäß SAE J 1704 (Jan. 97) sind der nachfolgenden Tabelle 2 zu entnehmen. The results after the corrosion test according to SAE J 1704 (Jan. 97) are shown in Table 2 below.  

Tabelle 2 Table 2

Claims (7)

1. Hydraulische Flüssigkeiten mit verbessertem Korrosionsschutz, enthaltend
  • a) 0,005 bis 0,125 Gew.-% 1H-1,2,4-Triazol und
  • 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 De­ rivaten das Gew.-Verhältnis von 1H-1,2,4-Triazol zu den genannten 1H-1,2,3-Triazolen größer als 4 : 1 sein muß.
1. Containing hydraulic fluids with improved corrosion protection
  • a) 0.005 to 0.125% by weight of 1H-1,2,4-triazole and
  • b) 0 to 10 wt .-% of one or more further corrosion inhibitors, the weight when using 1H-1,2,3-benzotriazole and / or 1H-1,2,3-tolutriazole and / or their derivatives . Ratio of 1H-1,2,4-triazole to the 1H-1,2,3-triazoles mentioned 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 Triazole-based. 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-Histaminopurin 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-dich loropurine, 6-methoxypurine, 1H-1,2,3-triazolo (4,5B) pyryidine, 6-histaminopurine and 6-furfurylaminopurine and optionally other corrosion inhibitors other than (a). 5. Bremsflüssigkeiten für Kraftfahrzeuge, enthaltend als Korro­ sionsinhibitoren die Komponenten (a) und gegebenenfalls (b) gemäß den Ansprüchen 1 bis 4.5. Brake fluids for motor vehicles, containing as a corro sion inhibitors components (a) and optionally (b) according to claims 1 to 4. 6. Bremsflüssigkeiten für Kraftfahrzeuge nach Anspruch 5, ent­ haltend neben den Komponenten (a) und gegebenenfalls (b) wei­ terhin 0,1 bis 97 Gew.-% eines oder mehrerer Polyglykolether und/oder deren Borsäureester.6. Brake fluids for motor vehicles according to claim 5, ent holding next to components (a) and optionally (b) white thereafter 0.1 to 97 wt .-% 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.
DE10117647A 2001-04-09 2001-04-09 Hydraulic fluids with improved corrosion protection Withdrawn DE10117647A1 (en)

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DE10117647A DE10117647A1 (en) 2001-04-09 2001-04-09 Hydraulic fluids with improved corrosion protection
CA2442697A CA2442697C (en) 2001-04-09 2002-04-03 Hydraulic fluids having improved corrosion protection
CZ20032736A CZ299651B6 (en) 2001-04-09 2002-04-03 Brake fluid for motor vehicles exhibiting enhanced protection against corrosion
KR1020037013131A KR100861969B1 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
CNB028079027A CN1312261C (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
HU0303757A HUP0303757A2 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
US10/469,770 US20040116306A1 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
MXPA03007944A MXPA03007944A (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties.
JP2002579971A JP4116445B2 (en) 2001-04-09 2002-04-03 Hydraulic fluid with improved corrosion protection
SK1192-2003A SK286828B6 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
PL367159A PL197796B1 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
AU2002308121A AU2002308121B2 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
BR0208415-5A BR0208415A (en) 2001-04-09 2002-04-03 automotive brake fluid
PT02759789T PT1379615E (en) 2001-04-09 2002-04-03 HYDRAULIC FLUIDS WITH IMPROVED ANTI-CORROSIVE PROPERTIES
ES02759789T ES2235077T3 (en) 2001-04-09 2002-04-03 HYDRAULIC LIQUIDS WITH IMPROVED ANTI-CORROSION PROTECTION.
DE50201902T DE50201902D1 (en) 2001-04-09 2002-04-03 HYDRAULIC LIQUIDS WITH IMPROVED CORROSION PROTECTION
EP02759789A EP1379615B1 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
ARP020101223A AR033453A1 (en) 2001-04-09 2002-04-03 HYDRAULIC LIQUIDS WITH ANTI-CORROSIVE PROTECTION
PCT/EP2002/003671 WO2002081604A1 (en) 2001-04-09 2002-04-03 Hydraulic fluids with improved anti-corrosion properties
AT02759789T ATE286112T1 (en) 2001-04-09 2002-04-03 HYDRAULIC FLUIDS WITH IMPROVED CORROSION PROTECTION
NO20034495A NO325635B1 (en) 2001-04-09 2003-10-08 Brake Fluid for Motor Vehicles
ZA200308690A ZA200308690B (en) 2001-04-09 2003-11-07 Hydraulic fluids with improved anti-corrosion properties.

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