EP0011730B2 - Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure - Google Patents
Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure Download PDFInfo
- Publication number
- EP0011730B2 EP0011730B2 EP79104326A EP79104326A EP0011730B2 EP 0011730 B2 EP0011730 B2 EP 0011730B2 EP 79104326 A EP79104326 A EP 79104326A EP 79104326 A EP79104326 A EP 79104326A EP 0011730 B2 EP0011730 B2 EP 0011730B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- weight
- formula
- oleic acid
- brake fluids
- 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.)
- Expired
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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
- 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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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- 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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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
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- 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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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
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- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
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- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
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- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
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- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
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- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
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- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
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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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- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
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- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
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- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/08—Hydraulic fluids, e.g. brake-fluids
Definitions
- Brake fluids with a preservative effect containing oleic acid Brake fluids with a preservative effect containing oleic acid.
- the invention relates to brake fluids based on polyglycol ethers and polyglycols containing fatty acids.
- DOT-3 brake fluids generally have good corrosion protection against tinplate, steel, cast iron, brass, copper and aluminum. Corrosion protection is only guaranteed if the metals are completely immersed in the liquid or otherwise well wetted by it.
- a major disadvantage of this brake pastes is that they greatly increase in re-filling of the brake system with brake fluid, the viscosity, so that the viscosity of the filled fluid under circumstances, the maximum viscosities of 1,500.10- 3 m 2 / s at -40 ° C substantially exceeds. Such mixtures then no longer meet the requirements of FMVSS 116, DOT3.
- Brake fluids containing corrosion-inhibiting oleic acid based on polyglycol ethers and polyglycols are already known from British patent specification 1,081,294.
- di- or trialkylene glycols should be used according to the teaching of the patent mentioned.
- these brake fluids provide insufficient rust protection in moisture corrosion tests compared to the brake fluids of the invention.
- a brake fluid consisting of a) 20% by weight polypropylene glycol with an average molecular weight of 2000; b) an alkenyl dicarboxylic acid anhydride; c) 78.2% by weight of a commercial, technical polyglycol ether mixture and d) antioxidants were available to the public prior to the priority date of the present patent.
- the task was therefore to propose brake fluids that can be used for impregnation at the same time and that allow the components to be stored for longer periods without corrosion.
- the high molecular weight polyalkylene glycols are carrier substances that have low water solubility and are characterized by high lipophilicity. This allows them to dissolve the oleic acid more, so that the concentration of oleic acid in the brake fluid can be up to 3%.
- Polyalkylene glycols of the formula I contained therein can consist solely of polypropylene glycols or can be prepared by mixing predominantly polypropylene glycols with polyethylene glycols or by reacting mixtures of ethylene oxide and (in excess) propylene oxide, statistical mixtures of compounds being formed which on average contain more propylene oxide than ethylene oxide residues and have molecular weights in the specified range.
- polyethylene glycols can also be reacted with propylene oxide or polypropylene glycols with ethylene oxide, the starting polyglycols the amount of alkylene oxides and the polymerization conditions being chosen so that polyalkylene glycols according to the formula with the molecular weights specified there of 500 to 3000, preferably 1800 to 2200, are formed.
- the procedure is expediently such that an epoxy mixture consisting of the desired molar ratios of ethylene oxide and propylene oxide is polymerized by methods known per se.
- Oleic acid is used as corrosion inhibitor.
- the basic components are the polyglycol ethers of the formula 11 which are customary in brake fluids, for example
- the brake fluids according to the invention can also contain boric acid esters of glycol ethers of the formula 11, e.g. in amounts of 20 to 50% by weight.
- Suitable boric acid esters are e.g. Methyl-tri-glycol-ortho-bora, ethyl-tri-glycol-ortho-borate, methyl / ethyl-di / tri-ortho-borate.
- cast iron wheel brake cylinders are halved on the long side, cleaned with isopropanol and dried well.
- the halved brake cylinder is then immersed in the brake fluid for 5 seconds each, drained for 5 seconds and stored in a closed container over a water vapor-saturated atmosphere.
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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)
Description
- Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure.
- Die Erfindung betrifft Bremsflüssigkeiten auf der Basis von Polyglykolethern und Polyglykolen mit einem Gehalt an Fettsäuren.
- Handelsüblichen Bremsflüssigkeiten, die den US-Normen des Federal Motor Vehicle Safety Standard FMVSS 115, DOT 3 bzw. des Handbook of the Society of Automotive Engineers SAE J 1703 entsprechen, bestehen im wesentlichen aus Glykolethern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten und enthalten Inhibitoren zwecks Korrosionsschutz und Antioxidationsmittel.
- Diese DOT-3-Bremsflüssigkeiten weisen im allgemeinen guten Korrosionsschutz gegenüber Weissblech, Stahl, Grauguss, Messing, Kupfer und Aluminium auf. Der Korrosionsschutz ist jedoch nur dann gewährleistet, wenn die Metalle vollständig in die Flüssigkeit eingetaucht werden oder sonst von ihr gut benetzt werden.
- Um Bremsteile, insbesondere Radbremszylinder aus Grauguss, nach der Herstellung und Funktionsprüfung rostfrei lagern zu können, ist die Imprägnierung mit speziellen Bremspasten üblich.
- Ein wesentlicher Nachteil dieser Bremspasten besteht darin, dass sie bei Wiederbefüllung des Bremssystems mit Bremsflüssigkeit die Viskosität erheblich erhöhen, so dass die Viskosität der eingefüllten Bremsflüssigkeit unter Umständen die maximalen Viskositäten von 1,500.10-3 m2/s bei -40°C wesentlich übersteigt. Derartige Mischungen erfüllen dann nicht mehr die Anforderungen der FMVSS 116, DOT3.
- Aus der britischen Patentschrift 1 081 294 sind schon korrosionsinhibierende Ölsäure enthaltende Bremsflüssigkeiten auf der Basis von Polyglykolethern und Polyglykolen bekannt. Im Gegensatz zu den vorliegenden Bremsflüssigkeiten, die 10 und mehr Alkylenoxideinheiten im Polyalkylenglykol enthalten, sollen gemäss der Lehre der genannten Patentschrift Di- oder Trialkylenglykole verwendet werden. Diese Bremsflüssigkeiten geben jedoch im Vergleich mit den Bremsflüssigkeiten der Erfindung einen unzureichenden Rostschutz in Feuchtigkeitskorrosionstests.
- Eine Bremsflüssigkeit bestehend aus a) 20 Gew.% Polypropylenglykol mit einem durchschnittlichen Molekulargewicht von 2000; b) einem Alkenyldicarbonsäureanhydrid; c) 78,2 Gew.% eines handelsüblichen, technischen Polyglykolethergemisches und d) Antioxidantien war der Öffentlichkeit vor dem Prioritätstag vorliegenden Patents zugänglich.
- Es bestand daher die Aufgabe, Bremsflüssigkeiten vorzuschlagen, die gleichzeitig zur Imprägnierung verwendet werden können und die die Lagerung der Bauteile über längere Perioden ohne Korrosion ermöglichen.
- Allein die Erhöhung der Inhibitorkonzentration bzw. die Verwendung anderer Inhibitoren, z.B. von Fettsäuren kann zwar die korrosionsschützende Wirkung auf den benetzten Teil erhöhen. Man erhält aber nicht Flüssigkeiten die den Anforderungen, die an Bremsschutzflüssigkeiten gestellt werden, entsprechen. Ausserdem kann man die Konzentration der Fettsäuren oder Fettsäurederivate nur geringfügig steigern, weil diese Komponenten bei tiefer Temperatur zur Ausfällung neigen bzw. erhöhte Gummiquellung der SBR-Manschetten verursachen.
- Es wurde nun überraschenderweise gefunden, dass Bremsflüssigkeiten auf der Grundlage von Polyglykolethern als Basiskomponenten, Polyglykolen als Schmiermittelkomponenten mit einem Gehalt an Ölsäure als Korrosionsinhibitor gegebenenfalls weiteren Inhibitoren und Antioxydationsmittel der genannten Forderung genügen, wenn sie einen Gehalt von
- A) 10 bis 40 Gew.%, bezogen auf die Bremsflüssigkeit, Polyalkylenglykole in Form von einheitlichen Verbindungen oder Gemischen der Formel 1
- B) 0,1 bis 3 Gew.% Ölsäure, sowie als Ergänzung zu 100% die folgenden Bestandteile,
- C) Polyglykolether der Formel
- D) gegebenenfalls Polyglykol des Ethylenoxids und/oder Propylenoxids mit einem Molekulargewicht im Molekulargewichtsbereich üblicher Schmiermittel in Bremsflüssigkeiten, und/oder
- E) gegebenenfalls 20 bis 50 Gew.% von Borsäureestern von Glykolethern der Formel 11 und
- F) geringe Mengen an sich bekannter Antioxydantien und Inhibitoren ausgewählt aus der Gruppe bestehend aus Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Ethanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol
- Die hochmolekularen Polyalkylenglykole sind dabei Trägersubstanzen, die geringe Wasserlöslichkeit aufweisen und durch hohe Lipophilität gekennzeichnet sind. Dadurch können sie die Ölsäure vermehrt lösen, so dass die Konzentration der Ölsäure bis zu 3% in der Bremsflüssigkeit betragen kann.
- Die erfindungsgemäss in den Bremsflüssigkeiten enthaltenen Polyalkylenglykole der Formel I können allein aus Polypropylenglykolen bestehen oder durch Mischen von vorwiegend Polypropylenglykolen mit Polyethylenglykolen oder durch Umsetzen von Gemischen von Ethylenoxid und (in Überschuss) Propylenoxid hergestellt werden, wobei statistische Gemische von Verbindungen entstehen, die im Mittel mehr Propylenoxid als Ethylenoxidreste enthalten und Molekulargewichte in dem angegebenen Bereich aufweisen.
- Man kann aber auch Polyethylenglykole mit Propylenoxid oder Polypropylenglykole mit Ethylenoxid umsetzen, wobei die Ausgangspolyglykole die Menge der Alkylenoxide und die Polymerisationsbedingungen so gewählt werden, dass Polyalkylenglykole gemäss Formel mit den dort spezifizierten Molgewichten von 500 bis 3000, vorzugsweise 1800 bis 2200, entstehen.
- Zweckmässig geht man zur Herstellung der Polyalkylenglykole der Formel im einzelnen so vor, dass ein Epoxid-Gemisch, bestehend aus den jeweils gewünschten Molverhältnissen Ethylenoxid und Propylenoxid nach an sich bekannten Methoden polymerisiert wird.
- Als Korrosionsinhibitoren wird Ölsäure verwendet.
-
- Als weitere Inhibitoren und Antioxydationsmittel kommen die ebenfalls an sich bekannten Verbindungen:
- Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Ethanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol in Betracht.
- Die erfindungsgemässen Bremsflüssigkeiten können auch Borsäureester von Glykolethern der Formel 11 enthalten, z.B. in Mengen von 20 bis 50 Gew.%. Geeignete Borsäureester sind z.B. Methyl-tri-glykol-ortho-bora, Ethyl-tri-glykol-ortho-borat, Methyl-/Ethyl-di/tri-ortho-borat.
- Weitere Boresterverbindungen sind in der USA-3 711 410 im einzelnen beschrieben.
- Zur Untersuchung der Wirkung der erfindungsgemässen Bremsflüssigkeiten werden Radbremszylinder aus Grauguss längsseitig halbiert, mit Isopropanol gereinigt und gut getrocknet. Man taucht dann den halbierten Bremszylinder jeweils 5 Sekunden in die Bremsflüssigkeit ein, lässt 5 Sekunden abtropfen und lagert sie in einem geschlossenen Gefäss über einer wasserdampfgesättigten Atmosphäre.
- Zum Vergleich mit üblichen Bremsflüssigkeiten wurden folgende Versuche durchgeführt:
- 1. Feuchtigkeitskorrosionstest mit der SAE RM 1 Reference-Fluid: Bereits nach wenigen Tagen war starke Korrosion der Graugussbremszylinder festzustellen.
- 2. Verwendung einer handelsüblichen Bremsflüssigkeit gemäss DOT 3 der folgenden Zusammensetzung: 20% Polyglykol, Mol-Verh. EO/PO 2:4 (EO = Ethylenoxid, PO = Propylenoxid), Mol-Gew. 300, 20% Triethylenglykol, 5% Butyltriglykol, 25% Ethyltriglykol, 29,4% Ethyldiglykol, 0,25% Dibutylamin, 0,30% Bisphenol A, 0,05% Benzotriazol. Nach wenigen Stunden bis zwei Tagen war starker Rostansatz auf den Graugussteilen zu beobachten.
- 3. Verwendung von einer Bremsflüssigkeit, bestehend aus ca. 70 Gewichtsteilen Glykolether, 25% eines handelsüblichen Schmiermittels auf EO/PO-Basis (Molverhältnis 2:1, Molgewicht 1100), 3% einer Mischung von Korrosionsinhibitoren aus Benzotriazol, Dodecylamin, Triethanolamin und 2% Ölsäure. (Die Ölsäure scheidet sich beim Abkühlen teilweise aus; es tritt eine Trübung ein.) Nach ca. 8 Stunden konnte Rostansatz beobachtet werden.
- 4. Es wurde die gleiche Mischung wie unter 3, angegeben verwendet, nur wurden anstelle der 25% Schmiermittel nur 15% Schmiermittel verwendet und 10% eines PO-Adduktes in Kombination mit einem PO/EO-Addukt (Zusammensetzung 90% PO/10% EO, mittlerer MG 2000). Im Korrosionsversuch zeigte sich nach 30 Tagen keinerlei Rostansatz.
- 5. 25% Polypropylenglykol mit Molgewicht 900, 20% Ethyltriglykol, 30% Ethyldiglykol, 2% Ölsäure, 1,5% Dibutylamin, 4% eines Glycerin-Borsäureadduktes, 0,05% Benzotriazol und 17,45% Methyltriglykol. Die Viskosität bei -40°C betrug 1,276.10-3 m2/s, der Kochpunkt 215°C, pH-Wert 9,3. Die Flüssigkeit entspricht SAE J 1703. Im Feuchtigkeitskorrosionstest nach 30 Tagen kein Rostansatz.
Claims (1)
- Bremsflüssigkeiten auf der Basis von Polyglykolethern und Polyglykolen mit einem Gehalt von Fettsäuren, dadurch gekennzeichnet, dass sie enthaltenA) 10 bis 40 Gew.%, bezogen auf die Bremsflüssigkeit, Polyalkylenglykole in Form von einheitlichen Verbindungen oder Gemischen der Formel 1B) 0,1 bis 3 Gew.% Ölsäure sowie, als Ergänzung zu 100%, die folgenden Bestandteile:C) Polyglykolether der FormelD) gegebenenfalls Polyglykole des Ethylenoxids und/oder Propylenoxids mit einem Molekulargewicht im Molekulargewichtsbereich üblicher Schmiermittel in Bremsflüssigkeiten und/ oderE) gegebenenfalls 20 bis 50 Gew.% von Borsäureestern von Glykolethern der Formel 11 undF) geringe Mengen an sich bekannter Antioxydantien und Inhibitoren ausgewählt aus der Gruppe bestehend aus Benzotriazol, Imidazol, Imidazolin, prim., sek. Amine, Ethanolamine, Bisphenol A, Triphenylphosphit oder 2,4-Di-tert.-butyl-kresol.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782851057 DE2851057A1 (de) | 1978-11-25 | 1978-11-25 | Bremsfluessigkeiten mit konservierender wirkung |
DE2851057 | 1978-11-25 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0011730A1 EP0011730A1 (de) | 1980-06-11 |
EP0011730B1 EP0011730B1 (de) | 1982-10-06 |
EP0011730B2 true EP0011730B2 (de) | 1986-06-04 |
Family
ID=6055539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79104326A Expired EP0011730B2 (de) | 1978-11-25 | 1979-11-06 | Bremsflüssigkeiten mit konservierender Wirkung mit einem Gehalt an Ölsäure |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0011730B2 (de) |
DE (2) | DE2851057A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1227061B (it) * | 1988-09-13 | 1991-03-14 | Lubritalia Spa | Fluidi idrodinamici di sicurezza resistenti alla propagazione della fiamma e con elevata temperatura di autoaccensione e procedimento per la loro preparazione. |
US6855676B2 (en) * | 2002-02-11 | 2005-02-15 | Ecolab., Inc. | Lubricant for conveyor system |
WO2010053641A1 (en) * | 2008-11-07 | 2010-05-14 | Dow Global Technologies Inc. | Low viscosity functional fluids |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2434978A (en) * | 1944-04-15 | 1948-01-27 | William A Zisman | Anticorrosion additives for synthetic lubricants |
NL302392A (de) * | 1962-12-28 | |||
GB1388012A (en) * | 1972-02-09 | 1975-03-19 | Shell Int Research | Hydraulic fluids and their preparation |
-
1978
- 1978-11-25 DE DE19782851057 patent/DE2851057A1/de not_active Withdrawn
-
1979
- 1979-11-06 DE DE7979104326T patent/DE2963824D1/de not_active Expired
- 1979-11-06 EP EP79104326A patent/EP0011730B2/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0011730A1 (de) | 1980-06-11 |
EP0011730B1 (de) | 1982-10-06 |
DE2963824D1 (en) | 1982-11-11 |
DE2851057A1 (de) | 1980-06-12 |
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