US3231497A - Polyphenyl ether blends - Google Patents

Polyphenyl ether blends Download PDF

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Publication number
US3231497A
US3231497A US277020A US27702063A US3231497A US 3231497 A US3231497 A US 3231497A US 277020 A US277020 A US 277020A US 27702063 A US27702063 A US 27702063A US 3231497 A US3231497 A US 3231497A
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US
United States
Prior art keywords
bis
ester
blends
ether
cobalt
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 - Lifetime
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US277020A
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English (en)
Inventor
Stanley D Koch
John O Smith
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.)
Monsanto Research Corp
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Monsanto Research Corp
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Publication date
Priority to GB1053062D priority Critical patent/GB1053062A/en
Application filed by Monsanto Research Corp filed Critical Monsanto Research Corp
Priority to US277021A priority patent/US3274107A/en
Priority to US276992A priority patent/US3231499A/en
Priority to US277020A priority patent/US3231497A/en
Priority to US276976A priority patent/US3189548A/en
Priority to BE647154D priority patent/BE647154A/xx
Priority to CH555964A priority patent/CH450599A/fr
Priority to NL6404793A priority patent/NL6404793A/xx
Priority to ES299300A priority patent/ES299300A1/es
Priority to DE19641594482 priority patent/DE1594482A1/de
Priority to SE5381/64A priority patent/SE309817B/xx
Priority to FR972832A priority patent/FR1398990A/fr
Application granted granted Critical
Publication of US3231497A publication Critical patent/US3231497A/en
Anticipated expiration legal-status Critical
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    • C10N2040/13—Aircraft turbines

Definitions

  • This invention relates to functional fluids, and more particularly, provides novel functional fluids comprising mixtures of ester base fluids and polyphenyl ethers.
  • polyphenyl ether fluids have been found to be well adapted for use as functional fluids in applications requiring high temperature stability. They have unusually good thermal and oxidative stability. These fluids, moreover, have superior lubricating ability and resistance to foaming.
  • the polyphenyl ethers have a very wide liquid range, remaining in the. liquid phase at temperatures from below 100 F. up to as high as 800 F. or above.
  • the metalinked variety have a particularly wide liquid range, and it has been found that a mixture of about 65% (by weight) In bis(m-phenoxyphenoxy)benzene, 30% m-[(m-phenoxyphenoxy) (p-phenoxyphenoxy)]benzene and mbis(p-phenoxyphenoxy)benzene provides a composition which is liquid at below ordinary room temperature, while retaining thermal stability to above 800 F.
  • the pour point of this mixture at which its viscosity becomes above 500,000 centistokes, is about 40 F., so that use of this material itself where engine cold starts are required is impractical.
  • a particular object of this invention is to provide functional fluid compositions comprising polyphenyl ether base fluids having an improved liquid operating temperature range.
  • blends of polyphenyl ether and ester lubricant base fluids provide functional fluid compositons having an advantageous liquid range and which, particularly when combined with antioxidant additives as set forth hereinafter, also possess unusual high temperature oxidative stability.
  • These functional fluid compositions are particularly adapted for use as lubricants in environments such as jet engines, requiring fluidity in the liquid phase combined with oxidative stability over a range such as from 0 F. to 500 F.
  • the polyphenyl ethers are not generally miscible with other base fluids: they do not dissolve more than about 5% by weight mineral oil, for example. Attempts to blend silicones with the phenylether base fluids have shown that only a few of this class of fluids are miscible with the polyphenyl ethers, and then to a limited extent. However, it has been found that the polyphenyl ethers can be combined 'with other oxygenated carbonaceous base fluids to provide homogeneous fluids having advantageous properties.
  • Blending of ester base fluids with the polyphenyl ethers has been discovered to result in an unexpectedly steep reduction of the viscosity of the ethers.
  • the viscosities of the blends are not the arithmetical average of the components, and indeed, reduction of the ether viscosity produced by introduction of the ester is even greater than can be attributed to a logarithmic effect.
  • blends can be produced with the fluidity range needed for lubricant use, where the engine must be able to make a cold start and yet operate at elevated temperatures, employing ether: ester weight ratios in the range of from 25:75 to :25.
  • blends containing a substantial proportion of the polyphenyl ethers, have desirably enhanced high temperature oxidative stability as compared to the ester components thereof.
  • the percentage viscosity increase on exposure of the blends to oxidative conditions at elevated temperatures is sufliciently diminished to make the blends useful as functional fluids at operating temperatures where the ester itself cannot be used.
  • blends of 25 to 75 weight percent polyphenyl ethers with 75 to 25 weight percent neopentyl polyol ester base fluids are found to be unexpectedly responsive to certain anti-oxidant additives.
  • Temperature has been shown to be critical to the high temperature oxidative stability of neopentyl polyol base fluids.
  • an inhibited trimethylolpropane ester is degraded only slightly by exposure to an air flow as high as 96 liters per hours (Gunderson et al., eds, Synthetic Lubricants, Reinhold, 1962, p. 395).
  • Att 500 F. the same fluid almost doubles in viscosity within 24 hours at a 5 liter per hour air flow rate.
  • blends of neopentyl polyol esters with polyphenyl ethers have been found to exhibit a unique and pronounced oxidative stability increase upon combination with an (alkanedionato) cobalt coordination compound.
  • the 500 F. oxidative stability of the blends combined with such cobalt compounds is markedly superior to that of a blend containing the inhibitor used in the ester providing the above-stated results.
  • other metal pentanedionates do not exhibit such antioxidant activity, and indeed, exert a pro-oxidant eifect in the blends.
  • the useful amines include polyaryl amines and polyarylidene polyamines containing at least two benzene nuclei.
  • compositions which not only have the fluidity at 0 F. and below that the polyphenyl ethers lack, but also the oxidative stability at 500 F. that the neopentyl polyol esters lack, and which are uniquely adapted as lubricants for jet engine systems requiring ability to operate from a cold start up to running temperatures of about 500 F.
  • the polyphenyl ethers employed in the compositions of this invention have from 3 to 7 benzene rings and from 1 to 6 oxygen atoms, with the stated oxygen atoms joining the benzene rings in chains as ether linkages.
  • One or more of the benzene rings in these polyphenyl ethers may be hydrocarbyl substituted.
  • the hydrocarbyl substituents for thermal stability, must be free of CH and aliphatic CH, so that preferred aliphatic substituents are lower saturated hydrocarbon radicals (1 to 6 carbon atoms) like methyl and tert-butyl, and preferred aromatic substituents are aryl radicals like phenyl, tolyl, t-butylphenyl and u-cumyl.
  • the benzene ring supplied in the hydrocarbyl substituent contributes to the total number of benzene rings in the molecule.
  • Polyphenyl ethers consisting exclusively of chains of from 3 to 7 benzene rings with at least one oxygen atom joining the stated benzene rings in the chains as an ether linkage have particularly desirable thermal stability.
  • polyphenyl ethers containing aliphatic carbon which are suitable for high temperature base fluids are 3-ring polyphenyl ethers like 1-(p-methylphenoxy)-4- phenoxybenzene and 2,4-diphenoxy 1 methylbenzene, 4-ring polyphenyl ethers like bis[p-(p-methylphenoxy) phenyl] ether and bis[p-(p-tert-butylphenoxy)phenyl] ether, and so forth.
  • Polyphenyl ethers consisting exclusively of benzene rings and including ether oxygen atoms linking said rings are exemplified by the triphenoxy benzenes and arylsubstituted polyphenyl ethers such as biphenylyl phenoxyphenyl ether, biphenylyloxyphenyl phenoxyphenyl ether, biphenylyl ether, dibiphenylyloxybenzene, bis(biphenylyloxyphenyl) ether, and the like.
  • a preferred class of the polyphenyl ethers are those consisting of benzene rings joined in a chain by oxygen atoms as ether linkages between each ring, of the formula C H O(C H.,O ,,C H where n is an integer of from 1 to 5.
  • polyphenyl ethers contemplated in this class are the bis(phenoxyphenyl) ethers (4 benzene rings joined in a chain by 3 oxygen atoms), illustrative of which is bis(m-phenoxyphenyl) ether.
  • the bis(phenoxyphenoxy) benzenes are particularly valuable in the present connection. Illustrative of these are m-bis(mphenoxyphenoxy)benzene, m bis (p phenoxyphenoxy) benzene, o-bis(o-phenoxyphenoxy)benzene, and so forth.
  • polyphenyl ethers contemplated herein include the bis(phenoxyphenoxyphenyl) ethers such as bis- [m- (m-phenoxyphenoxy) phenyl] ether, bis [p-(p-phenoxyphenoxy)phenyl] ether, and m (m-phenoxyphenoxy) phenyl m-(o-phenoxyphenoxy)phenyl ether, and the bis- (phenoxyphenoxyphenoxy)benzenes such as m-bis[m-(mphenoxyphenoxy) phenoxy] benzene, p-bis [p- (m-phenoxyphenoxy)phenoxy]benzene and m-bis [m (p phenoxyphenoxy) phenoxy] benzene.
  • bis(phenoxyphenoxyphenyl) ethers such as bis- [m- (m-phenoxyphenoxy) phenyl] ether, bis [p-(p-phenoxyphenoxy)phenyl] ether, and m (m-phenoxyphenoxy
  • the preferred polyphenyl ethers are those having all their ether linkages in the meta-positions since the allmeta-linked ethers are particularly advantageous because of their wide liquid range and high thermal stability.
  • mixtures of the polyphenyl ethers either isomeric mixtures or mixtures of homologous ethers, can also advantageously be used in some applications, especially where particular properties such as lower solidification points are required.
  • Mixtures of polyphenyl ethers in which the non-terminal phenylene rings are linked through oxygen atoms in the meta and para positions have been found to be particularly suitable to provide compositions with wide liquid ranges.
  • a preferred polyphenyl ether mixture of this invention is the mixture of bis- (phenoxyphenoxy)benzenes wherein the non-terminal phenylene rings are linked through oxygen atoms in the meta and para position, and composed by weight of about 65% m-bis(m-phenoxyphenoxy)benzene, 30% m[(mphenoxyphenoxy) (p-phenoxyphenoxy) ]benzene and 5 m-bis(p-phenoxyphenoxy)benzene.
  • Such a mixture solidiprimary alcohols of the C to C range.
  • polyphenyl ethers can be obtained by known procedures such as, for example, the Ullmann ether synthesis, which broadly relates to ether-forming reactions wherein alkali metal phenoxides such as sodium and potassium phenoxide are reacted with aromatic halides such as bromobenzene in the presence of a copper catalyst such as metallic copper, copper hydroxides, or copper salts.
  • Ullmann ether synthesis which broadly relates to ether-forming reactions wherein alkali metal phenoxides such as sodium and potassium phenoxide are reacted with aromatic halides such as bromobenzene in the presence of a copper catalyst such as metallic copper, copper hydroxides, or copper salts.
  • the high temperature, oxygenated carbonaceous base fluids employed in the compositions of this invention will also comprise a synthetic ester base fluid.
  • These are fluids of lubricating viscosity and thermally stable to at least about 400 R, which are esters of alcohols containing at least 4 carbon atoms and which generally contain more than one ester group. They may be esters of polyhydric alcohols, of polybasic acids, or both.
  • Ester fluids with particularly advantageous low temperature viscosity properties are provided by the diesters of dibasic acids.
  • Ester lubricants of the dibasic acid ester type are illustrated by diesters of long chain dicarboxylic acids like azelaic acid with long-chain branched
  • the synthetic ester lubricants also frequently include the esters of long chain monobasic acids such as pelargonic acid with glycols such as polyethylene glycols.
  • Complex esters are also formed by linking dibasic acid half esters through a glycol such as dipropylene glycol, a polyethylene glycol of 200 molecular weight, and so forth.
  • polyester type lubricant fluids have been reported to be valuable and also, it is common practice to achieve desired properties in the ultimate base fluid by blending different polyester products.
  • Simple esters providing suitable fluids can be exemplified, for example, by bis(2-methylbutyl) sebacate, bis(1-methyl-4-ethyloctyl) sebacate, bis(2-ethylhexyl) sebacate, dipropylene glycol dipelargonate, the diesters of acids such as sebacic, azelaic and adipic acid with complex C -C primary branched chain alcohols such as those produced by the oxo process, polyethylene glycol 200 bis(2-ethylhexyl sebacate), diisoamyl adipate, 1,6-hexamethylene glycol di(2-ethylhexanoate), bis(dimethylamyl) azelate and so forth.
  • Ester fluids with particularly good high temperature oxidation resistance are provided by neopentyl polyol esters.
  • the alcohols from which these esters are derived have the carbon structure of neopentane, with a central carbon atom surrounded by 4 substituent carbon atoms.
  • Included in the neopentyl polyols are neopentyl glycol, trimethylolethane, trimethylolpropane and pentaerythritol.
  • the base fluids comprising neopentyl polyol esters are the esters with monocarboxylic acids. Such esters are generally more oxidatively and thermally stable than the dibasic. acid esters.
  • the useful esters of the neopentyl polyols include, for example, the esters of trimethylol propane, neopentyl glycol and pen taerythritol with normal, branched chain and mixed acids having chain lengths varying from C to C
  • an illustrative series of esters are trimethylolpropane tri-npelargonate, trimethylolpropane tricaprate, trimethylolpropane tricaprylate, the trimethylolpropane triester of mixed octanoates, and the like.
  • ester fluids adapted for use as lubricant base stocks and useful in the provision of the blends of this invention, reference may be made, for example, to the discussion in Gunderson et al. Synthetic Lubricants (Reinhold, 1962).
  • the polyphenyl ether blends of the present invention will consist of a blend of at least one polyphenyl ether and at least one ester lubricant base fluid, with the polyphenyl ether component providing from about 25 to 75 weight percent of the total. These blends will have a pour point at least as low as about F.; desirably, they will have a pour point Well below 0 F., and a viscosity of below about 25,000 centistokes at 0 F.
  • Illustrative of the fluid blends of this invention are, for example, blends of polyphenyl ethers with diesters.
  • Preferred compositions of this nature include blends of bis(phenoxyphenoxy)benzenes with alkanedicarboxylic acid diesters of alkanols of the formula wherein each of R R and R are saturated aliphatic hydrocarbon of from 4 to 12 C atoms.
  • such blends are illustrated by blends in which 25 to 75 weight percent of the total is a bis(phenoxyphenoxy)benzene and the remainder is a dialkyl alkanedicarboxylate such as bis(Z-ethylhexyl) sebacate, bis(2 ethylhexyl) azelate, bis(l-methylcyclohexyl) sebacate, di-C -oxo azelate and di-C -oxo azelate (where the 0x0 alcohols are mixtures of branched chain alcohols made by the 0x0 process, C oxo alcohol consisting chiefly of a mixture of 3,4-, 3,5-, and 4,5-dimethyl-1- hexanol, for example).
  • a dialkyl alkanedicarboxylate such as bis(Z-ethylhexyl) sebacate, bis(2 ethylhexyl) azelate, bis(l-methylcyclo
  • blends including diesters can be provided, for example, by combining one or more bis(phenoxyphenoxy)benzenes with a fiuoroalkyl diester such as 1,1-H-perfluoroheptyl sebacate, with a polyalkylene glycol ester such as dipropylene glycol dipelargonate, and so forth.
  • a fiuoroalkyl diester such as 1,1-H-perfluoroheptyl sebacate
  • a polyalkylene glycol ester such as dipropylene glycol dipelargonate
  • Still other useful blends may be prepared by combining polyphenyl ethers such as trisphenoxybenzenes, bis(phenoxyphenyl) ethers, diphenoxybenzenes and the like with ethers such as bis(l-ethylpropyl) adipate, bis(l,3-dimethylbutyl) sebacate, di(2-ethylhexyl) sebacate and the like, or with other combinations of the polyphenyl ethers and diester lubricant base stocks such as those mentioned above.
  • polyphenyl ethers such as trisphenoxybenzenes, bis(phenoxyphenyl) ethers, diphenoxybenzenes and the like
  • ethers such as bis(l-ethylpropyl) adipate, bis(l,3-dimethylbutyl) sebacate, di(2-ethylhexyl) sebacate and the like, or with other combinations of the polyphenyl ethers and
  • the especially preferred class of blends of polyphenyl ethers with neopentyl polyesters is the especially preferred class of blends of polyphenyl ethers with neopentyl polyesters.
  • exemplary of this class are blends of bis (phenoxyphenyl) ethers and of bis(phenoxyphenoxy)benzenes, preferably including the ethers with meta-oriented substituents, with trimethylolpropane esters such as the tri-n-heptanoate and trineoheptanoate and with entaery-thritol esters such as the tetracaprate and tetracaproate esters, and so forth.
  • blends are provided by combinations of polyphenyl ethers such as 1-(p-u-cumy1phen-oxy)- 4-phenoxybenzene, mixed bis(phenoxyphenoxy)benzenes, and so forth, with neopentyl glycol n-heptanoate, pentaerythritol tetraester with mixed nonanoic acids and the like, as well as by other combinations of the polyphenyl ethers with neopentyl polyol esters as discussed above. Also, it is to be appreciated that mixtures of different polyphenyl ethers, diesters and neopentyl polyol esters are in the scope of the blend compositions of this invention.
  • compositions wherein an antioxidant additive is combined with the stated base stock blends are provided in accordance with the present invention, wherein an adjuvant amount of an (alkanedionato) cobalt coordination compound is combined with polyphenyl ether/ synthetic ester base fluid blend of the above-discussed nature.
  • the presently useful cobalt coordination compounds include the cobaltous and cobaltic 1,3-propanedionates (alkanedionates with beta-positioned 0x0 groups) wherein substituents of the propanedione carbon chain are hydrocar-bon free of aliphatic (olefinic and acetylenic) unsaturation, and the dione may contain from to 15 carbon atoms.
  • cobalt compounds of the stated nature are bis(2,4-pentanedionato) cobalt, tris(2,4 pentanedionato) cobalt, tris(2 ethyl lphenyl-1,3-hexanedionato) cobalt, tris(2,4-hexanedionato) cobalt, bis(2,4-hexanedionato) cobalt, tris(5,5-dimethyl- 2,4-hexanedionato) cobalt, tris(5-methyl-2,4-hexanedi- 6 onato) cobalt, tris(3-benzyl-2,4pentanedionat-o) cobalt, bis(Z-ethyl-l-phenyl-1,3-butanedionato) cobalt, tris(2- methyl-l-phenyl-1,3-butanedionato) cobalt, tris(l-na
  • the antioxidant additive employed in the formulated lubricants of this invention may consist of the cobalt alkanedionate alone or in combination with further oxidation-suppressing additives. It has been found that particularly effective suppression of the oxidative degradation of the present base stock blends is produced by combinations of aromatic amines with the cobalt alkanedionate compounds.
  • an aromatic amine is meant an amine including a benzene ring.
  • useful amines contain at least two benzene nuclei, which may be either phenyl radicals or part of a fused ring system such as napht-hyl.
  • benzene nuclei include arylamines and arylidene amines wherein the benzene nuclei are attached to the amine nitrogen atoms either directly by a ring carbon atom or through a single aliphatic carbon atom.
  • aromatic amines contemplated herein are free of aliphatic (olefinic and aetylenic) unsaturation, contain from 12 to 36 carbon atoms, and consist of hydrocarbon radicals and amino nitrogen atoms, which may or may not have oxy (oxygen joined to atoms selected from C and H) radicals as substituents.
  • aliphatic (olefinic and aetylenic) unsaturation contain from 12 to 36 carbon atoms, and consist of hydrocarbon radicals and amino nitrogen atoms, which may or may not have oxy (oxygen joined to atoms selected from C and H) radicals as substituents.
  • oxy oxygen joined to atoms selected from C and H radicals
  • aryl amines such as naphthylamine (0a or B), naphthylenediamine (1,2- l,5- 1,8-), N-methyl-fl-naphthylamine, benzidine, 2,4'-diaminobiphenyl, Z-aminobiphenyl, 4-aminobiphenyl, diphenylamine, 4-a-minodiphenylamine, N-phenylphenylenediamine, N-ethyl-a-naphthylamine, 2,4-diaminodiphenylamine, 1,2-diphenylethylenediamine, 'N-benzylaniline, methylenedianiline, l-aminoanthracene, l-aminophenanthrene, di-p-tolylamine, 4-dimethylaminodiphenylamine, N,N'-diphenylethylenediamine, o-di
  • Exemplary of presently useful arylidene amines are N,N'-dibenzylidene-p-phenylenediamine, N,N bis(2,3- dimethylbenzylidene)-p phenylenediamine, N,N bis(Z- hydroxybenzylidene)-p-phenylenediamine, N,N' bis(2- ethoxybenzylidene)-p-phenylenediamine, N,N' bis(Z-hydroxybenzylidene)ethylenediamine, N,N bis(2 hydroxybenzylidene)-1,2-propylenediamine, N,N' bis(2- hydroxybenzylidene)-l,3-propylenediamine, N,N bis(3- ethoxy 4 hydroxybenzylidene)-l,2-propylenedia:inine, N,N bis(2-hydroxy-4-methylbenzylidene)-p-phenylenediamine, N-3-methylbenzylidene
  • the antioxidant compounds are combined with the base fluid to the extent of, generally, between about 0.01% and 10%, individually or jointly, by weight of the fluid.
  • compositions may additionally include any of a wide variety of further additives.
  • the base fluids may be combined with lubricity improvers effective to increase load-carrying ability, decrease wear, or both, with viscosity index improvers such as polymethacrylate alkyl esters, with detersives and dispersants, and so forth.
  • the antioxidant eifect of the present additive compounds air is bubbled through heated samples of the base fluids and base fluids plus additives.
  • the percent change in (100 F.) viscosity from before to after oxidation is an index of anti-oxidant activity.
  • the conditions employed are temperatures of 500 and a flow rate of 1 liter of air per hour. Samples are run in the presence :and absence of metal wires (silver, copper, aluminum, stainless steel) as a check on the efiect of such metals on the oxidation rate.
  • Example 1 This example illustrates the blends of this invention, and viscosity properties of the blends.
  • the polyphenyl ether base stock referred to in the following discussion is a bis(phenoxyphenoxy)benzene mixture of the composition 65 m-bis (m-phenoxyphenoxy) benzene 30% m-[ (m-phenoxyphenoxy) (p-phenoxyphenoxy) benzene 5 m-bis (p-phenoxyphenoxy) benzene.
  • This fluid is liquid at room temperature, has a viscosity of about 350 centistokes (cs.) at 100 F., and has a pour point (viscosity above 500,000 cs.) of 40 F.
  • Viscosity cs. Percent Ester Low Temp. 100 F.
  • Example 2 conducted by exposing the base stocks to an air flow rate of 1 liter per hour for 24 hours at 500 F. in the presence of metal (Al, Cu. Ag, and Fe) wires.
  • Blends are prepared by combining bis(m-phenoxyphenyl) ether with the trimethylolpropane trienanthate identified in Example 2 as C-TMP.
  • the composition consisting of ether and 20% ester has a 0 F. viscosity of 22,000 cs., and a F. viscosity of 38 es; in the proportion of 70% ether and 30% ester, the base stock blend has a 0 F. viscosity of 6800 cs. and .a 100 F. viscosity of 32 cs.
  • Example 4 This example illustrates still other blend compositions of this invention, produced by combining three different base stocks.
  • Blends having a 100 F. viscosity of 39 cs. are prepared by combining pentaerythritol tetracaprate, the trimethylolpropane trienanthate ester identified above as the C-TMP ester, and the mixture of bis(phenoxyphenoxy)benzenes described in Example 1, in the following weight proportions:
  • Example 5 100 F. Viscosity, cs. Pentane- Evap., Ester, percent dionato 00 percent;
  • composition-s including base stocks blends prepared and identified as described in Example 3, and 1 g./100 g. base stock of freshly pre- 9 pared cobalt 2,4-pentanedionate, results obtained are as follows:
  • the blend containing 45% C-TMP ester combined with 1% of 5-phenyl-lO,10-diphenylp-henazas-ilane has an initial viscosity of 50 es, and an after-test viscosity of 76 cs., which is an increase of 52% in 24 hours, with an evaporation loss of 5.0%.
  • the TMP ester blends combined with the 1,3-pen-tanedionato sodium, chromium, titanium and zinc chelate compounds form heavy deposits in 24 hours, amounting to as much as 90% of the weight of the sample.
  • Bis bis(2,4-pentanedionato) cobalt.
  • Tris tris(2,4-pentanedionato) cobalt.
  • Percent weight percent of weight of base fluid.
  • a functional fluid composition having a pour point below about 0 F., consisting essentially of a base stock blend of at least one polyphenyl ether and at least one synthetic ester base fluid, in which the polyphenyl ether constituent provides from 25 to 75 weight percent of the total, and the said synthetic ester base fluid constituent is a fluid of lubricating viscosity thermally stable to at least about 400 F., said ester being the ester of an alcohol containing at least 4 carbon atoms, and a 1,3- propanedionato cobalt compound, in an amount sufficient to increase the oxidative stability of said base stock blend.
  • a functional fluid composition having a pour point below about 0 F., consisting essentially of a base stock blend of a polyphenyl ether consisting of a chain of benzene rings including at least one oxygen atoms as an ether linkage between said benzene rings and a neopentyl polyol ester, wherein said polyphenyl ether provides from 25 to 75 weight percent of the total, an aromatic amine containing at least two benzene nuclei, in an amount of from about 0.01% to 10% by weight of said base stock blend, and a 1,3-propanedionato cobalt compound, in
  • a functional fluid composition having a pour point below about 0 F. consisting essentially of a base fluid blend of a polyphenyl ether consisting of a chain of from 3 to 7 benzene rings and oxygen atoms as other linkages between each ring in the chain, and a trimethylolpropane trialkanoate ester, wherein said polyphenyl ether provides from 25 to 75 percent of the weight of the total, and a 1,3-propanedionato cobalt compound, in an amount sufficent to increase the oxidative stability of said base stock blend.
  • composition of claim 3 wherein said 1,34propanedionato cobalt compound is a (2,4-pentanedionato) cobalt compound.
  • a functional fluid composition having a pour point below about 0 F., consisting essentially of a base fluid blend of a polyphenyl ether consisting of a chain of from 3 to 7 benzene rings and oxygen atoms as ether linkages between each ring in the chain, and a trimethylolpropane trialkanoate ester, wherein said polyphenyl ether provides from 25 to 75 percent of the weight of the total, from about 0.01% to 10%, by weight of said base fluid blend, of a 1,3-propanedionato cobalt compound, and from about 0.01% to 10%, by weight of said base fluid blend, of an aromatic amine containing at least two benzene nuclei, the combined amounts of said 1,3-pr0panedionato cobalt com-pound and said aromatic amine being sufficient to increase the oxidative stability of said base stock blend.
  • a functional fluid composition having a pour point below about 0 F. consisting essentially of a base fluid blend of a mixture of bis(phenoxyphenoxy)benzenes and trimethylolpropane trienanthate, wherein said mixture of bistphenoxyphenoxy)benzenes provides from 25 to 75 percent of the weight of the total, and a 1,3-propanedionato cobalt compound in an amount sufficient to increase the oxidative stability of said base fluid blend.
  • composition of claim 6 in which said cobalt compound is bis(2,4-pentanedionato) cobalt (II).
  • a functional fluid composition having a pour point below about 0 F., consisting essentially of a base fluid blend of a mixture of bis (phenoxyphenoxy)benzenes and trimethylolpropane trienanthate, wherein said mixture of bis(phenoxyphenoxy)benzenes provides from 25 to 75 percent of the total, from about 0.01% to 10% by weight of said base fluid blend, of a 1,3-propanedionato cobalt compound, and from about 0.01% to 10%, by weight of said base fluid blend, of an aromatic amine containing at least two benzene nuclei, the combined amounts of said 1,3-propanedionato cobalt compound and said aromatic amine being suflicient to increase the oxidative stability of said base stock blend.
  • composition of claim 9 in which said 1,3-propanedionato cobalt compound is bis(2,4-pentanedionato)- cobalt, and said aromatic amine is N-[(l-aminocyclohexyl) methyl] -N-phenyl-p-phenylenediamine.
  • a functional fluid composition having a pour point below about 0 F. consisting essentially of a base fluid blend of a mixture of bis(phenoxyphenoxy)benzenes and trimethylolpropane trienanthate, wherein said mixture of bis(phenoxyphenoxy)benzenes provides from 25 to 75 percent of the weight of the total, from about 0.01% to 10%, by weight of said base fluid blend, of N,N'-bis(2- hydroxybenzylidene) p phenylene diamine, and from 0.01% to 10%, by weight of said base fluid blend, of a (2,4-pentanedionato)cobalt compound.

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US277020A US3231497A (en) 1963-04-30 1963-04-30 Polyphenyl ether blends
US276976A US3189548A (en) 1963-04-30 1963-04-30 Polyphenyl ethers containing an extreme pressure additive
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CH555964A CH450599A (fr) 1963-04-30 1964-04-28 Composition à propriétés lubrifiantes
NL6404793A NL6404793A (es) 1963-04-30 1964-04-29
ES299300A ES299300A1 (es) 1963-04-30 1964-04-29 Mejoras introducidas en la preparación de composiciones de mezclas de polifenil éteres
DE19641594482 DE1594482A1 (de) 1963-04-30 1964-04-29 Polyphenyl-aether-Mischungen
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US3412028A (en) * 1966-12-13 1968-11-19 Texaco Inc Synthetic ester base lubricating composition containing a copper or cobalt acetylacetonate
US4753741A (en) * 1986-05-27 1988-06-28 Japan Atomic Energy Research Institute Super highly radiation-resistant grease
US9644127B2 (en) 2012-09-14 2017-05-09 Tokyo Ohka Kogyo Co., Ltd. Heating medium composition for solar thermal power generation system

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US3409552A (en) * 1964-04-01 1968-11-05 Chevron Res Alkyl aryl ether polymers in lubricants
US3492229A (en) * 1966-08-26 1970-01-27 Monsanto Co Functional fluid compositions
US3455846A (en) * 1966-12-29 1969-07-15 Monsanto Co Lubricant compositions
US3773665A (en) * 1971-11-17 1973-11-20 Mobil Oil Corp Lubricants containing amine antioxidants
US4032462A (en) * 1976-05-24 1977-06-28 Chevron Research Company Lubricating oil additive composition
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Also Published As

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US3231499A (en) 1966-01-25
BE647154A (es) 1964-08-17
NL6404793A (es) 1964-11-02
US3274107A (en) 1966-09-20
DE1594482A1 (de) 1971-06-09
GB1053062A (es)
CH450599A (fr) 1968-01-31

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