DE1047356B - Schmieroel auf der Basis fluessiger Ester - Google Patents
Schmieroel auf der Basis fluessiger EsterInfo
- Publication number
- DE1047356B DE1047356B DES48336A DES0048336A DE1047356B DE 1047356 B DE1047356 B DE 1047356B DE S48336 A DES48336 A DE S48336A DE S0048336 A DES0048336 A DE S0048336A DE 1047356 B DE1047356 B DE 1047356B
- Authority
- DE
- Germany
- Prior art keywords
- lubricating oil
- hydrocarbon
- mineral
- viscosity
- mixture
- 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.)
- Pending
Links
Classifications
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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
- 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
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
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- C10M101/00—Lubricating compositions characterised by the base-material being a mineral or fatty oil
- C10M101/02—Petroleum fractions
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- C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
- C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
- C10M105/32—Esters
- C10M105/36—Esters of polycarboxylic acids
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- C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
- C10M107/34—Polyoxyalkylenes
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/08—Resistance to extreme temperature
-
- 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
- C10N2040/02—Bearings
-
- 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
-
- 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
- C10N2040/12—Gas-turbines
-
- 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
- C10N2040/12—Gas-turbines
- C10N2040/13—Aircraft turbines
-
- 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
- C10N2070/00—Specific manufacturing methods for lubricant compositions
- C10N2070/02—Concentrating of additives
Landscapes
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- Lubricants (AREA)
Description
Schmieröle, die in Flugzeugmotoren und für Gasturbinen angewendet werden sollen, müssen eine
Schmierung über einen weiten Temperaturbereich ermöglichen, sie sollen ferner zwecks Anwendung bei
hohen Temperaturen eine ausreichende Oxydationsund Wärmebeständigkeit aufweisen und möglichst
einen niedrigen Stockpunkt für das Arbeiten bei niedrigen Temperaturen zeigen. Gleichzeitig sollen sie
wenig flüchtig sein und einen hohen Flammpunkt haben, um Verdampfungsverluste und die Gefahr
einer Entzündung zu vermeiden.
Für diesen speziellen Zweck sind bereits Schmieröle auf der Basis flüssiger Diester von der Formel
R'OOC.R.COOR", in welcher R einen zweiwertigen
gesättigten aliphatischen Kohlenwasserstoffrest und R' sowie R" Alcyl-, Aralcyl- oder Cycloalcylreste
mit mehr als 2 Kohlenstoffatomen bedeuten, verwendet worden, welche zusätzlich 2 bis 30 Gewichtsprozent
eines polymeren Acrylsäure- oder Alcylacrylsäureesters und solche Mengen eines Salzes
einer aromatischen Carbonsäure oder eines Phenoles mit einem Metall aus der zweiten Gruppe des
Periodischen Systems enthalten, daß der Metallgehalt des Schmieröls 0,01 bis 1 Gewichtsprozent beträgt.
Solche Schmieröle verhalten sich zwar in vielen praktischen Anwendungsfällen recht befriedigend, da
das Polymerisat als Verdickungsmittel und Viskositätsindexverbesserer wirkt, doch zeigen sie auch
häufig den Nachteil einer Viskositätsverminderung im Verlauf des Schmiervorganges, was auf eine Depolymerisierung
der polymeren Komponente infolge der mechanischen Beanspruchung zurückzuführen sein
dürfte. Dieser Mangel wirkt sich besonders nachteilig bei hydraulischen Einrichtungen und in solchen
Gasturbinen aus, bei denen das Schmiermittel gleichzeitig als hydraulische Flüssigkeit dient.
Es ist ferner bekannt, bestimmte Komplexester, die bei der vollständigen Veresterung einer Dicarbonsäure
mit einem Ester einer gesättigten aliphatischen, mindestens eine Äthergruppe enthaltenden Hydroxysäure
erhalten werden, wegen ihres hohen Viskositätsindex und niedrigen Stockpunktes nicht nur an sich
als Schmieröle zu verwenden, sondern sie auch Mineralschmierölen von gleicher Viskosität zur Aufbesserung
zuzusetzen.
Desgleichen ist empfohlen worden, Ester aus Dicarbonsäure und verzweigtkettigen, aus der Oxosynthese
gewonnenen Alkoholen mit 10( bis 36 Kohlenstoffatomen im Alkoholteil Mineralschmierölen beizumischen,
um SO' deren Viskositätsindex zu erhöhen.
Es wurde nun überraschenderweise gefunden, daß die erwähnten Nachteile bei den bisher bekannten
Esterschmierölen überwunden werden können, indem man die flüssigen Diester von der Formel
Schmieröl auf der Basis flüssiger Ester
Anmelder:
»Shell« Research Limited, London
»Shell« Research Limited, London
Vertreter: Dr. K. Schwarzhans, Patentanwalt,
München 19, Romanplatz 9
München 19, Romanplatz 9
Beanspruchte Priorität:
Großbritannien vom 14. April 1955
Großbritannien vom 14. April 1955
John Owen Cliffe, Whitby, Cheshire,
und Donald Reece, Birkenhead,
und Donald Reece, Birkenhead,
Cheshire (Großbritannien),
sind als Erfinder genannt worden
sind als Erfinder genannt worden
R'OOC.R.COOR" mit ganz bestimmten Kohlenwasserstoffschmierölen
in Mengen von 2 bis 50 Gewichtsprozent, berechnet auf das Gemisch aus Ester und Kohlenwasserstofföl, und mit Salzen aus einer
aromatischen Carbonsäure oder einem Phenol und einem Metall aus der II. Gruppe des Periodischen
Systems kombiniert. Das Kohlenwasserstoffschmieröl soll erfindungsgemäß einen Viskositätsindex über 70
und eine Viskosität von mindestens 374 SUS bei 38° C aufweisen. Das Salz eines zweiwertigen Metalles
wird in solchen Mengen verwendet, daß das fertige Schmieröl 0,01 bis 1 Gewichtsprozent an
Metall enthält.
Diese neuen Schmieröle sind ausreichend oxydationsbeständig, sie haben einen hohen Flammpunkt
und einen für praktische Zwedce ausreichend hohen Viskositätsindex. Gegenüber den bekannten Zusammensetzungen
weisen sie aber den wesentlichen Vorteil einer stabilen Viskosität auch bei stärkerer
mechanischer Beanspruchung auf, was sich insbesondere zu erkennen gibt, wenn man ein solches Öl
mehrmals durch eine Injektionsdüse führt.
Die erfindungsgemäß in Betracht kommenden flüssigen Diester, in deren Formel R' und R" Alcyl-,
Aralcyl- oder Cy clo alcyl reste mit mehr als 2 Kohlenstoffatomen bedeuten und R ein zweiwertiger gesättigter
aliphatischer Kohlenwasserstoffrest ist, sind abgeleitet von gesättigten aliphatischen zweibasischen
Säuren, wie Malon-, ÄÜiylmalon-, Bernstein-, Methylbernstein-,
1,1- oder 1,2-Diäthylbernstein-, Glutar-,
1- oder 2-Methylglutar-, 1,3-Diäthylglutar-, Adipin-,
809 700/520
1- oder 2-Methyladipin-, Pimelin-, 1,2,5-Trimethylpimelin-,
Kork-, Azelain-, Sebacin-, Nonan-, 1,9-Dicarbon- und Decan-l.lO-dicarbonsäure sowie von
Alkanolen, wie den Propanolen, Butanolen, Hexanolen,
Octanolen und Nonanolen oder Aralkanolen, wie Benzyl- und Phenyläthylalkohol, oder Cycloalkanolen,
wie Cyclopentanon Cyclohexanol und Methylcyclohexanol. Typische flüssige Ester, welche
im Rahmen der Erfindung mit Vorteil verwendet werden können, sind Di-(2-methylheptyl) -adipinsäureester,
Di- (3,5,5-trimethylhexyl) -adipinsäureester oder der entsprechende Sebacinsäureester, Di-(3-äthylhexyl)-adipinsäureester
oder der entsprechende Sebacinsäureester, Dihexylpimelinsäureester, Di-(2-äthylhexyl)
-sebacinsäureester, Di-sek.-butyl-sebacinsäureester, Di-sek.-hutylmalonsäureester, Di-(l-äthylpropyl)-azelainsäureester
und Di-butyläthy!malonsäureester.
Als Schmiermittelgrundlage für die erfindungsgemäßen Zusammensetzungen kann ein einzelner
flüssiger Ester oder ein Gemisch aus zwei oder mehreren solchen Estern verwendet werden.
Das Kohlenwasserstoffschmieröl kann irgendein Mineralöl oder ein synthetisch hergestelltes Öl sein,
welches die angegebenen Eigenschaften in bezug auf den Viskositätsindex und die Mindestviskosität aufweist.
Vorzugsweise liegt die Viskosität zwischen 681 und 1364 SUS bei 38° C und der Viskositätsindex
über 85. Mineralische Schmieröle werden bevorzugt verwendet, insbesondere mit Lösungsmitteln
raffinierte mineralische Schmieröle und entparaffinierte mineralische Schmieröle. Wenn ein solches
Öl besonders zur Abscheidung von Paraffin bei niederen Temperaturen neigt, so kann ihm ein üblicher
Stockpunktserniedriger einverleibt werden.
Die dritte wichtige Komponente der erfindungsgemäßen Schmieröle ist ein Salz einer aromatischen
Carbonsäure oder eines Phenols mit einem Metall der Gruppe II des Periodischen Systems, welches in dem
Gemisch aus flüssigem Ester und Kohlenwasserstoffschmieröl in dem erforderlichen Ausmaß löslich ist.
Diese Salze erhöhen die Beständigkeit des zusammengesetzten Schmiermittels gegen Oxydation und Hitzeeinwirkung
unter den Arbeitsbedingungen bei hoher Temperatur und verhindern die Lackbildung auf den
Lagern von beispielsweise Gasturbinen.
Von den Metallen der II. Gruppe sind Zink und Calcium für den vorliegenden Zweck am geeignetsten;
man kann aber auch Beryllium-, Magnesium-, Strontium-, Cadmium-, Barium- oder Quecksilbersalze
verwenden. Die aromatische Carbonsäure bzw. das Phenol soll ausreichende oleophile Eigenschaften aufweisen,
um zu gewährleisten, daß das verwendete Metallsalz in dem Schmierölgemisch so weit löslich
ist, daß in dem Gesamtschmieröl der Metallgehalt zwischen 0,01 und 1 Gewichtsprozent beträgt. Man
kann neutrale oder basische Salze oder Gemische aus normalen und basischen Salzen benutzen.
Besonders geeignete aromatische Säuren sind Benzoesäure, Naphthoesäure, 4-tert.-Butylbenzoesäure,
2,4-Ditert.-butylbenzoesäure, Di-isopropylsalicylsäuren,
Octylsalicylsäuren, Pentadecenylsalicylsäuren, Octadecylsalicylsäuren, Stearylsalicylsäuren und Octyl-4-oxybenzoesäuren.
Die Salze der alkylierten Oxybenzoesäuren sind bevorzugt. So können z. B. Salze der Gemische von alkylierten Oxybenzoesäuren
verwendet werden, die man durch Umsetzung von Salicylsäure oder 4-Oxybenzoesäure mit einem Gemisch
von Alkenen erhält, wie es beim Spalten von festem Paraffin anfällt, oder mit einem Gemisch von
Alkoholen in Anwesenheit eines geeigneten Kondensierungsmittels, wie 90- bis 98%üge Schwefelsäure
oder Zinkchlorid. Besonders wirksam sind die Zinksalze alkylischer Salicylsäuren mit 12 bis 20 und insbesondere
14 bis 18 Kohlenstoffatomen in der Alkylgruppe.
Geeignete Phenole sind Phenol selbst, die Naphthole, die Kresole und die höheralkylierten Phenole,
wie Amyl-, Octyl-, Nonyl-, Decyl-, Tetradecyl-,
ίο Pentadecanyl- und Octadecyl-phenol. Es können Salze
von Mischungen aus Alkylphenolen, wie man sie z. B. durch Alkylieren eines Phenols mit Alkengemischen
erhält, verwendet werden, und diese werden wegen ihrer niedrigen Schmelzpunkte im Vergleich zu den
reinen Alkylphenolen bevorzugt. So kann z. B. ein Gemisch von Alkylphenolen, das durch Alkylieren von
Phenol oder eines Kresols oder von 1- bzw. 2-Naphthol mit einem Alkengemisch von 8 bis 18 Kohlenstoffatomen
im Molekül hergestellt worden ist, verwendet werden. In dem Phenol kann mehr als eine Alkyl-
oder Alkenylgruppe und es können auch andere Ringsubstituenten vorhanden sein, sofern sie die Öllöslichkeit
des Phenols nicht unerwünscht herabsetzen. So können in dem Phenol Halogene bzw.
Alkoxy-, Alcylmercapto- und Alcylaminogruppen vorliegen.
Salze, welche sich von Kondensationsprodukten gewisser, kohlenwasserstoffsubstituierter Phenole mit
Formaldehyd oder Acetaldehyd ableiten, sind besonders wirksam. Insbesondere kommen solche Kondensationsprodukte
in Betracht, die aus einem kohlenwasserstoffsubstituierten Phenol hergestellt sind,
welches mindestens 4 Kohlenstoffatome im Substituenten enthält und mit Formaldehyd oder Acetaldehyd
unter Bildung harzartiger Kondensationsprodukte reagieren kann. Diese Kondensationsprodukte können durch Umsetzen mit basischen Verbindungen
der Metalle aus der II. Gruppe in Salze umgewandelt werden, oder die Salze können direkt
hergestellt werden, indem man die Kondensationsreaktion in Anwesenheit einer basischen Verbindung
eines Metalls der II. Gruppe, vorzugsweise in Anwesenheit eines inerten Verdünnungsmittels, durchführt.
Um auch das Verhalten der erfindungsgemäßen Schmieröle bei hohen Temperaturen weiter zu verbessern,
kann man ihnen 0,05 bis 5 Gewichtsprozent Phenthiazin oder eines im Kern substituierten Derivates
von Phenthiazin einverleiben. Als solche Zusatz stoffe kommen beispielsweise 2,2'-Dimethylthiodiphenylamin,
3-Fluorthiodiphenylamin, 4-Aminothiodiphenylamin, N-Benzyl-2-aminothiodiphenylamin,
Thiophenylnaphthylamin und Thiodinaphthylamin in Frage.
Vorzugsweise verwendet man ein praktisch reines Phenthiazin oder Kernsubstitutionsprodukte desselben,
da manche der im Handel erhältlichen Produkte beim Erhitzen in Anwesenheit von Schmierstoffen
die Neigung zur Abscheidung einer geringen Menge eines schwarzen Niederschlages haben.
Das Phenthiazin oder sein Kernsubstitutionsprodukt verbessert die Beständigkeit des Schmieröles
gegenüber der Oxydation bei hohen Temperaturen, setzt die Menge des gebildeten Lackes herab und verringert
auch die Korrosion von Metallen, welche sonst bei hohen Temperaturen in verstärktem Maße
eintritt. Vor allem wird aber der Ölabbau bei hohen Temperaturen verringert und gleichzeitig kann auch
die Menge des verwendeten Metallsalzes herabgesetzt werden, ohne daß die Beständigkeit des Gemisches
1 U4/ DOO
gegen Oxydation und Lackbildung beeinträchtigt wird.
Die folgenden Beispiele erläutern die Erfindung näher. Die genannten Teile und Prozentsätze beziehen
sich auf das Gewicht.
Gemisch I
63 Teile eines Gemisches von Estern, welches 70% Di-(3,5,5-trimethylhexyl)-sebazat, 20% Di-(2-äthylhexyl)-sebazat
und 10% Di-(3,5,5-trimethylhexyl)-adipat enthält;
34 Teile eines mit Lösungsmittel raffinierten und entparaffinierten mineralischen Schmieröls
mit einem Viskositätsindex von 96 und einer Viskosität von 650 Sekunden Redwood I bei 60° C = 739 SUS (60° C);
3 Teile von Konzentrat A.
3 Teile von Konzentrat A.
Gemisch II
67,5 Teile des Estergemisches gemäß Gemisch I;
29,5 Teile eines mit Lösungsmittel raffinierten und entparaffinierten mineralischen Schmieröls
mit einem Viskositätsindex von 95 und einer Viskosität von 100O1 Sekunden Redwood
I bei 60° C = 1137 SUS (60° C); 3 Teile von Konzentrat A.
Gemisch III
69 Teile des im Gemisch I verwendeten Estergemisches ;
28 Teile eines mit Lösungsmittel raffinierten und entparaffinierten
mineralischen Schmieröls mit einem Viskositätsindex von 95 und einer Viskosität von 1000 Sekunden Redwood bei
60° C = 1137 SUS (6O0C);
3 Teile von Konzentrat A.
Gemisch IV
68,75 Teile des in Gemisch I verwendeten Estergemisches ; 30 Teile des in Gemisch II verwendeten mineralischen
Schmieröls;
0,75 Teile von Konzentrat A;
0,5 Teile Phenthiazin.
0,75 Teile von Konzentrat A;
0,5 Teile Phenthiazin.
Gemisch V
66 Teile des in Gemisch I verwendeten Estergemisches ;
30 Teile des in Gemisch II verwendeten mineralischen Schmieröls;
30 Teile des in Gemisch II verwendeten mineralischen Schmieröls;
3 Teile von Konzentrat A;
1 Teil eines handelsüblichen Stockpunktserniedrigers.
Das Konzentrat A wird wie folgt hergestellt: 60 Teile Paraoctylphenol werden in 260 Teile eines
lösungsraffinierten mineralischen Schmieröls eingerührt, welches 1 Teil Wasser und 9,7 Teile Calciumhydroxyd
enthält, anschließend werden 10,1 Teile Paraformaldehyd zugesetzt. Das Gemisch wird auf 85° C
erhitzt und die Temperatur im Verlaufe von 30 Minuten auf 95° C gesteigert und während einer weiteren
Stunde auf 95° C gehalten. Dann wird heiß filtriert. Man erhält ein Konzentrat mit einem Calciumgehalt
von l,2«/o.
Um den Vorteil der vorliegenden Erfindung aufzuzeigen, wurde das Gemisch IV 40mal durch eine
Injektionsdüse hindurchgeführt. Seine Viskosität vor und nach dieser Behandlung war die gleiche. Wenn
jedoch ein Gemisch X von ähnlicher Viskosität, welche Teile des in Gemisch I verwendeten Estergemisches,
Teile von Konzentrat A und 14 Teile eines PoIyalkylmethacrylats enthielt, der gleichen Behandlung
unterworfen wurde, erniedrigte sich seine Viskosität um mehr als 20 cSt.
Claims (8)
1. Schmieröl auf der Basis flüssiger Ester von der allgemeinen Formel R'OOC.R.COOR",
worin R ein zweiwertiger gesättigter aliphatischer Kohlenwasserstoffrest und R' und R" Alkyl-,
Aralkyl- oder Cycloalkylreste mit mehr als 2 Kohlenstoffatomen sind, dadurch gekennzeichnet,
daß es ein Kohlenwasserstoffschmieröl mit einem Viskositätsindex über 70 und einer Viskosität
von mindestens 374 SUS bei 38° C in einer Menge von 2 bis 50 Gewichtsprozent, berechnet
auf das Gesamtgewicht der Ester-Kohlenwasserstoff-Schmierölmischung, sowie 0,01 bis 1 Gewichtsprozent
des Gesamtschmieröls, berechnet auf das Metall, eines als Schmiermittelzusatz an
sich bekannten Salzes einer aromatischen Carbonsäure oder eines Phenols mit einem Metall aus
der II. Gruppe des Periodischen Systems, enthält.
2. Schmieröl nach Anspruch 1, dadurch gekennzeichnet, daß es als Kohlenwasserstoff schmieröl
ein solches mit einem Viskositätsindex über 85 enthält.
3. Schmieröl nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß es als Kohlenwasserstoffschmieröl
ein solches mit einer Viskosität zwischen 681 und 1364 SUS bei 38° C enthält.
4. Schmieröl nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es als Kohlenwasserstoffschmieröl
ein mineralisches Schmieröl enthält.
5. Schmieröl nach Anspruch 4, dadurch gekennzeichnet, daß es als mineralisches Schmieröl ein
mit Lösungsmittel raffiniertes mineralisches Schmieröl enthält.
6. Schmieröl nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß es als mineralisches Schmieröl
ein entparaffiniertes mineralisches Schmieröl enthält.
7. Schmieröl nach Anspruch 4, 5 oder 6, dadurch gekennzeichnet, daß es ein mineralisches Schmieröl
mit einem Stockpunktserniedriger enthält.
8. Schmieröl nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß es zusätzlich 0,05 bis 5 Gewichtsprozent
Phenthiazin oder ein im Kern substituiertes Derivat von Phenthiazin enthält.
In Betracht gezogene Druckschriften:
Britische Patentschriften Nr. 668 663, 668 796;
französische Patentschrift Nr. 1063 912;
Industr. and Eng. Chemistry, (1950), S. 2442.
Britische Patentschriften Nr. 668 663, 668 796;
französische Patentschrift Nr. 1063 912;
Industr. and Eng. Chemistry, (1950), S. 2442.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB311808X | 1951-06-25 | ||
GB10809/55A GB768905A (en) | 1951-06-25 | 1955-04-14 | Improvements in and relating to lubricating compositions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1047356B true DE1047356B (de) | 1958-12-24 |
Family
ID=26247776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES48336A Pending DE1047356B (de) | 1951-06-25 | 1956-04-12 | Schmieroel auf der Basis fluessiger Ester |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1047356B (de) |
GB (1) | GB768905A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2195674A1 (de) * | 1972-08-09 | 1974-03-08 | Sun Oil Co Pennsylvania |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB668663A (en) * | 1949-04-21 | 1952-03-19 | Standard Oil Dev Co | Improvements in or relating to synthetic ester lubricants |
GB668796A (en) * | 1950-01-03 | 1952-03-19 | Standard Oil Dev Co | Improvements in or relating to lubricating compositions |
FR1063912A (fr) * | 1951-06-25 | 1954-05-10 | Shell Refining & Marketing Co | Composition lubrifiante |
-
1955
- 1955-04-14 GB GB10809/55A patent/GB768905A/en not_active Expired
-
1956
- 1956-04-12 DE DES48336A patent/DE1047356B/de active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB668663A (en) * | 1949-04-21 | 1952-03-19 | Standard Oil Dev Co | Improvements in or relating to synthetic ester lubricants |
GB668796A (en) * | 1950-01-03 | 1952-03-19 | Standard Oil Dev Co | Improvements in or relating to lubricating compositions |
FR1063912A (fr) * | 1951-06-25 | 1954-05-10 | Shell Refining & Marketing Co | Composition lubrifiante |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2195674A1 (de) * | 1972-08-09 | 1974-03-08 | Sun Oil Co Pennsylvania |
Also Published As
Publication number | Publication date |
---|---|
GB768905A (en) | 1957-02-20 |
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