Abstract: A process for making a lube base stock wherein an olefinic feedstock is separated into a light olefin fraction and a medium olefin fraction. The light olefin fraction is contacted with a first oligomerization catalyst in a first oligomerization zone to produce a first product. Both the medium olefin fraction and the first product are contacted with a second oligomerization catalyst in a second oligomerization zone to produce a second product. The second product is separated into a light byproduct fraction and a heavy product fraction that includes hydrocarbons in the lube base stock range.

Abstract: A fluid blend suitable for use as a lube basestock comprises two major components: (A) a copolymer made from ethylene with one or more alpha olefins, the copolymer (i) containing not more than 50 wt % ethylene; (ii) having a number average molecular weight of from 400 to 10,000; and (iii) a molecular weight distribution<3; and (B) a polyalphaolefin fluid or a hydroprocessed oil having a VI greater than 80.

Abstract: A traction drive fluid is provided containing a naphthenic compound represented by the formula: wherein R1 is an alkyl group having 1 to 8 carbon atoms, R2 through R4 are each independently hydrogen or an alkyl group having 1 to 8 carbon atoms, and A is a naphthenic hydrocarbon group, a saturated polycyclic hydrocarbon group, a naphthenic ester group, or a naphthenic carbonate group.

Abstract: The invention provides methods for preparing a blended lube base oils comprising at least one highly paraffinic Fischer Tropsch lube base stocks and at least one base stock composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof. The use of base stocks composed of alkylaromatics, alkylcycloparaffins, or mixtures thereof improves the yield of lube base oils from Fischer Tropsch facilities, as well as provides moderate improvements in physical properties including additive solubility. The invention provides processes for obtaining such blended lube base oils using the products of Fischer Tropsch processes.

Abstract: The present invention concerns friction reducers for use in lubricating oil compositions which comprise certain groups of aromatic compounds, esters, narrow mixtures of base stocks, and/or amorphous polymers such as amorphous olefin copolymers. These compositions can provide substantial reductions in the coefficient of friction and fuel economy improving benefits when admixed to lubricating oils without deleterious effects such as instability, undesirable high viscosities and deposits. In one aspect of the invention, pentaerythritol esters and optionally triol esters are added to lubricating oil compositions to provide reduced friction and improved fuel economy. In a second aspect of the invention, similar results are obtained by adding hydrocarbyl aromatics to a lubricating oil composition containing one or more of Groups II and III base stock. In a third aspect, the invention concerns a lubricating oil composition comprising an amorphous olefin copolymer and one or more of Groups II and III base stocks.

Abstract: A two-cycle oil is disclosed consisting of a polybutene polymer, solvent and mineral oil which passes the JASO engine test for gasoline fueled two-cycle engines.

Abstract: The present invention provides a viscosity index improving lubricant additive which comprises an olefinic oligomer of about 2,000 to about 20,000 number average molecular weight having a viscosity of 75 to about 3,000 cSt at 100° C. and a hydrocarbyl aromatic which contains at least about 5% of its weight from aromatic moieties having a viscosity of about 3 to about 50 cSt at 100° C. where the weight ratio of hydrocarbyl aromatic component to olefin oligomer is from about 1:2 to about 50:1. In another aspect, the invention provides for a lubricating oil composition comprising a base oil and the instant viscosity index improving additive.

Abstract: A lube base oil comprising a synthetic lube base oil, such as a Fischer Tropsch-derived component, and a non-synthetic lube base oil is defined that has improved stability to oxidation both during storage and during use in engines or other applications, even in the substantial absence of anti-oxidant additives and oxidation promoters.

Abstract: A process for preparing hydrocarbons in the lube base oil range, lube base oils and lube oil compositions from a fraction with an average molecular weight above a target molecular weight and a fraction with an average molecular weight below a target molecular weight via molecular averaging is described. The fractions can be obtained, for example, from Fischer-Tropsch reactions, and/or obtained from the distillation of crude oil. Molecular averaging converts the fractions to a product with a desired molecular weight, for use in preparing a lube oil composition. The product can optionally be isomerized to lower the pour point, and also can be blended with suitable additives for use as a lube oil composition.

Abstract: The inventions relate to light oil compositions comprising a base oil, not less than 0.01% by volume of a light oil resulting from catalytic cracking and 20 to 200 ppm (on the weight basis) of a lubricity improver, with a total sulfur content of not more than 0.05% by weight, characterized in that the light oil resulting from catalytic cracking contains (1) not less than 25% by volume of bicyclic polycyclic aromatic compounds and (2) not less than 5% by volume of tricyclic polycyclic aromatic compounds. These compositions have a sulfur content of not more than 0.05% by weight and is excellent in lubricant performance.

Abstract: The inventions relate to light oil compositions comprising a base oil, not less than 0.01% by volume of a light oil resulting from catalytic cracking and 20 to 200 ppm (on the weight basis) of a lubricity improver, with a total sulfur content of not more than 0.05% by weight, characterized in that the light oil resulting from catalytic cracking contains (1) not less than 25% by volume of bicyclic polycyclic aromatic compounds and (2) not less than 5% by volume of tricyclic polycyclic aromatic compounds. These compositions have a sulfur content of not more than 0.05% by weight and is excellent in lubricant performance.

Abstract: Discloses novel biodegradable high performance hydrocarbon base oils useful as lubricants in engine oil and industrial compositions, and process for their manufacture. A waxy, or paraffinic feed, particularly a Fischer-Tropsch wax, is reacted over a dual function catalyst to produce hydroisomerization and hydrocracking reactions, at 700° F.+ conversion levels ranging from about 20 to 50 wt. %, preferably about 25-40 wt. %, sufficient to produce a crude fraction, e.g., a C5-1050° F.+ crude fraction, containing 700° F.+ isoparaffins having from about 6.0 to about 7.5 methyl branches per 100 carbon atoms in the molecule. The methyl paraffins containing crude fraction is topped via atmospheric distillation to produce a bottoms fraction having an initial boiling point between about 650° F. and 750° F. which is then solvent dewaxed, and the dewaxed oil is then fractionated under high vacuum to produce biodegradable high performance hydrocarbon base oils.

Abstract: This invention relates to mineral oil based gear oils and transmission fluids which comprise a major amount of a mineral oil having an iodine number of less than 9 and where at least 55% of the saturates are aliphatic, and gear oil or transmission fluid additives. In one embodiment, the invention relates to a gear oil or transmission fluid composition comprising a major amount of lubricant basestock and at least one functional additive wherein a major amount of the lubricant basestock comprises a mineral oil having an iodine number of less than 9 and comprising at least 45% by weight of aliphatic saturates. These gear oils and transmission fluids have good viscosity and oxidation properties.

Abstract: Premium synthetic lubricants comprise a synthetic isoparaffinic hydrocarbon base stock and an effective amount of at least one, and typically a plurality of lubricant additives such as a detergent, dispersant, antioxidant, antiwear additive, pout point depresant, VI improver and the like. The base stock is derived from a waxy, paraffinic, Fischer-Tropsch synthesized hydrocarbon feed fraction having an initial boiling point in the range of about 650-750° F. and continuously boiling up to at least 1050° F., by a process which comprises hydroisomerizing the feed and dewaxing the isomerate. The waxy feed has a T90−T10 temperature difference of at least 350° F. and is preferably hydroisomerized without any pretreatment, other than optional fractionation. The lubricant may also contain hydrocarbonaceous and synthetic base stock material.

Abstract: A functional fluid base oil is described comprising a mixture of (1) one or more naphthenic base stocks, and (2) one or more conventional solvent neutral base stocks and (3) one or more hydrocracked base stocks. The functional fluid base oil can be additized by the addition of one or more performance additives. The fluid is especially usefull as a power steering fluid base oil.

Abstract: A premium synthetic lubricating oil base stock having a high VI and low pour point is made by hydroisomerizing a Fischer-Tropsch synthesized waxy, paraffinic feed wax and then dewaxing the hydroisomerate to form a 650-750° F.+ dewaxate. The waxy feed has an initial boiling point in the range of about 650-750° F., from which it continuously boils up to at least 1050° F. and has a T90−T10 temperature difference of at least 350° F. The feed is preferably hydroisomerized without any pretreatment, other than optional fractionation. The 650-750° F.+ dewaxate is fractionated into two or more base stocks of different viscosity.

Abstract: There is disclosed a metal sheet product, more particularly formed food container stock and/or industrial sheet product, which has been treated with a lubricant composition having a vegetable oil portion which is less than about 60% monounsaturate in character, said composition comprising: (a) about 10-90 wt. % of a technical white mineral oil, preferably a polyalphaolefin, and/or white mineral oil, said component having an average molecular weight greater than about 400; and (b) about 10-90 wt. % of an edible vegetable oil selected from the group consisting of: safflower oil, canola oil, sunflower oil, corn oil, olive oil, cottonseed oil and combinations thereof. Preferably, the latter additive is a combination of about 8-20 wt. % safflower oil and about 25-50 wt. % canola oil. When applied in total deposited weights of about 0.

Abstract: A functional fluid base oil is described comprising a mixture of (1) one or more naphthenic base stocks, and (2) one or more conventional solvent neutral base stocks and (3) one or more hydrocracked base stocks. The functional fluid base oil can be additized by the addition of one or more performance additives. The fluid is especially useful as a power steering fluid base oil.

Abstract: A bitumen is rendered pipelineable by partially hydroconverting the bitumen and then adding sufficient diluent to the partially hydroconverted bitumen to provide a mixture having an API gravity at 15° C. of at least 19° and a viscosity at 40° C. in the range of about 35 to about 60 cP.

Abstract: A traction drive fluid comprising a naphthenic compound represented by the formula 1

Abstract: A process for making a lube base stock wherein an olefinic feedstock is separated into a light olefin fraction and a medium olefin fraction. The light olefin fraction is contacted with a first oligomerization catalyst in a first oligomerization zone to produce a first product. Both the medium olefin fraction and the first product are contacted with a second oligomerization catalyst in a second oligomerization zone to produce a second product. The second product is separated into a light byproduct fraction and a heavy product fraction that includes hydrocarbons in the lube base stock range.

Abstract: Lubricating oil compositions containing a medium molecular weight paraffin (MMWP) which is effective in improving the lubricant properties of an engine oil. The medium molecular weight paraffins disclosed include those having from between 10 to 20 carbon atoms. Compositions containing from 0.1% to 2% by volume of the engine oil are disclosed. The MMWP reduces varnishing, sludging, production of chemical byproducts and glazing. It also improves seal life and extends the life of lubricating oil compositions containing it.

Abstract: This invention provides a lubricant oil composition for internal combustion engines which shows a sufficiently low volatility at high temperature and good low-temperature viscosity characteristics.The lubricant oil composition for internal combustion engines comprises a base oil which simultaneously satisfies the following relationships (a.sub.1) and (b.sub.1):[(A.cndot.GCD5-50+B)Exp((C.cndot.GCD5-50+D)KV100)]/KV40>1, and(a.sub.1)E.cndot.Exp(F.cndot.KV100)/KV40>1, (b.sub.1)wherein, GCD5-50 is a difference between 5% and 50% distillation points (.degree. C.) by gas chromatographic distillation test, KV40 and KV100 are kinematic viscosities (mm.sup.2 /s) at 40.degree. C. and 100.degree. C., and A to F are constants, A: -3.17.times.10.sup.-3, B: 2.87, C: -3.78.times.10.sup.4, D: 4.91.times.10.sup.-1, E: 9.41, and F: 2.09.times.10.sup.-1.

Abstract: A premium synthetic lubricating oil base stock having a high VI and low pour point is made by hydroisomerizing a Fischer-Tropsch synthesized waxy, paraffinic feed wax and then dewaxing the hydroisomerate to form a 650-750.degree. F.+ dewaxate. The waxy feed has an initial boiling point in the range of about 650-750.degree. F., from which it continuously boils up to at least 1050.degree. F. and has a T.sub.90 -T.sub.10 temperature difference of at least 350.degree. F. The feed is preferably hydroisomerized without any pretreatment, other than optional fractionation. The 650-750.degree. F.+ dewaxate is fractionated into two or more base stocks of different viscosity.

Abstract: Conditioning oil for use on bowling lanes. The oil contains a mixture of mineral oil, a leveling agent, and an antistatic agent. The mineral oil is a combination of paraffin and petroleum based mineral oils, and in some embodiments, the mixture also includes isopropyl alcohol, a fluorescent whitening agent, and a lubricity agent.

Abstract: Petroleum products are marked with a marker such as thymolphthalein or cresolphthalein. When the marked petroleum products are contacted with a developing reagent, a color develops.

Abstract: Improving the flowability of mineral oils and mineral oil distillates using alkylphenol-aldehyde resinsThe invention relates to a process for improving the flowability of paraffin-containing mineral oils and mineral oil distillates by adding flow improvers based on ethylene/vinyl ester co- and terpolymers, alkylphenol-aldehyde resins and, if appropriate, other paraffin dispersants, mixtures of these different flow improvers and mineral oils and mineral oil distillates which comprise these flow improvers.

Abstract: Reaction products of polyolefins having predominantly a terminal double bond and a number average molecular weight of from 250 to 10,000, which possess an aliphatic hydrocarbon skeleton which is straight-chain or carries C.sub.1 -C.sub.4 -alkyl side chains, with from 1 to 10 mol, per equivalent of double bond, of one or more vinyl esters I ##STR1## are obtainable by reacting the stated polyolefins with the vinyl esters I in the presence of a free radical initiator at from 80 to 200.degree. C., it being possible for these reaction products subsequently to have been hydrolyzed to the corresponding alcohols or converted into the corresponding amines by reductive amination with amines II ##STR2## .

Abstract: A catalytic hydrodewaxing process is described for producing liquid hydrocarbon lubricant base stock from liquid hydrocarbon feedstock in greater yield and viscosity index equivalent to solvent dewaxing methods. The process involves contacting a feedstream comprising hydrogen and the hydrocarbon feedstock with shape selective metallosilicate catalyst particles under hydrodewaxing conditions sufficient to produce a base stock having a predetermined viscosity index without regard to the base stock pour point temperature produced by the process. Pour point depressants are added to the base stock to lower the pour point temperature of the base stock to a predetermined temperature.

Abstract: Composition of lubricating oil which comprises: a) a greater portion of synthetic lubricating component or a mixture of synthetic lubricating component and a mineral base for lubricating oils, the synthetic lubricating component being prepared by the oligomerization and subsequent hydrogenation and the possible removal of low-boiling by-products, of a composition of olefins basically consisting of:1) a mixture of n-olefins having a content of olefins from C.sub.14 to C.sub.17, preferably from C.sub.15 to C.sub.16, of at least 80%, preferably greater than 85%,2) alpha olefins from C.sub.15 to C.sub.17, preferably basically C.sub.16, the content of the alpha olefin (2) being from 5 to 25% by weight, preferably from 10 to 20%, with respect to the sum of (1)+(2).

Abstract: A method of making a novel lubricant additive comprising a boric acid modified aminoamide compound is disclosed. A lubricating oil composition incorporating the modified aminoamide compound is also disclosed, which exhibits enhanced high-temperature cleanliness when used particularly for two stroke cycle engines.

Abstract: A lubricant oil composition suitable for use as a tractor hydraulic fluid which comprises (a) a lubricating oil base stock which is a blend of a major amount of paraffinic mineral oil and a minor amount of a naphthenic mineral oil, and (b) a blend of a polymethacryalte viscosity index improver having a weight average molecular weight of 25,000 to 150,000 and a shear stability index less than 5 and a polymethacryate viscosity index improver having a weight average molecular weight of 500,000 to 1,000,000 and a shear stability index of 25 to 60. The formulated oil composition has a kinematic viscosity of 8.0 to 9.0 cSt at 100.degree. C., a minimum kinematic viscosity of 7.0 cSt at 100.degree. C. after 30 shear cycles, a maximum Brookfield viscosity of 17,000 cSt at -40.degree. C. and a maximum pour point of -45.degree. C.

Abstract: A semi-synthetic two-stroke engine oil formulation which comprises a base oil consisting of a high-viscosity mineral oil, a medium-viscosity mineral oil, a solvent and a mixture of three polyisobutylenes with different molecular weights, and appropriate detergents and dispersants. This semi-synthetic two-stroke engine has both high lubricity and high detergency, and also meets the requirements of low smoke and low exhaust system blocking.

Abstract: A composition which contains a 2-halo-2-halomethyl glutaronitrile and a 4,5-polymethylene-4-isothiazolin-3-one. The compositions exhibit anti-microbial activity and certain combinations of isothiazolinones together with the glutaronitrile are surprisingly effective against both bacteria and fungi.

Abstract: Lubricant base oils are made up essentially of 2-15% by weight of a total aromatics content, greater than 60% by weight of isoparaffins and monocyclic naphthenes in total, more than 30% by weight of alkylbenzenes in the total aromatics content and smaller than 4% by weight of tricyclic and tetracyclic aromatics in the total aromatics content. The base oil has great viscosity index, small pour point, high oxidative stability and heat stability and sufficient capability to dissolve sludge.

Abstract: Oil compositions are disclosed which are substantially undeteriorative even in an oxidizing atmosphere and suitably applicable as lubricating oils, heat transfer oils, heat treating oils and electrical discharge machining oils. The composition is essentially comprised of 100 weight parts of a selected base oil of a mineral or synthetic class and 0.1 to 20 weight parts of a specified oil fraction. The oil fraction is an oil generated from a hydrogenated pitch and distilled to boil at from 160.degree. to 550.degree. C., the pitch being derived by primarily heat-treating and hydrogenating a heavy oil of a petroleum or coal origin, or an oil resulting from secondarily heat-treating the pitch and boiling at from 160.degree. to 550.degree. C.

Abstract: Solvent-free lubricant compositions having improved lubricity properties comprising a basestock having a kinematic viscosity of about 1.5 to 3.0 cSt at 100.degree. C., about 3 to 15 wt % of bright stock having a kinematic viscosity about 20 to 40 cSt at 100.degree. C., about 3 to 15 wt % of a polyisobutylene having a number average molecular weight of about 400 to 1050 and about 3 to 15 wt % of a polyisobutylene having a number average molecular weight of about 1150 to 1650. Minor amounts of the lubricant composition may be incorporated into a distillate fuel to provide a lubricant oil-fuel composition for two-cycle engines.

Abstract: A blended mineral oil lubricant is made having a higher viscosity index than predicted by calculating the viscosity index from an ASTM standard method designated D 341-87 or by calculating the average of the actual VI based on the proportion of each component of the blend. The lubricant is treated with a peroxide compound, preferably an organic peroxide such as di-tertiary butyl peroxide to increase the viscosity index. The treated lubricant is blended with a lubricant of lower viscosity index to achieve a blended lubricant having an enhanced viscosity index. The lubricant charge stock and blending component can be a wax-derived lubricant fraction or a conventional light neutral or heavy neutral mineral oil.

Abstract: Liquid hydrocarbon lubricant viscosity index improver compositions are disclosed having high shear stability. The compositions comprise the homopolymer or copolymer product of the oligomerization of C.sub.3 to C.sub.5 alpha-olefin or mixtures thereof, with or without ethylene as co-monomer. The process is carried out under oligomerization conditions in contact with a reduced valence state Group VIB metal catalyst on porous support. The viscosity index improver of the invention has a regio-irregularity of at least 20%, weight average molecular weight between 6,000 and 30,000 and molecular weight distribution between 2 and 5.

Abstract: A lubricating oil composition comprising: (A) a base oil having a naphthene content of at least 30%, an aromatic content of not more than 2%, and a kinematic viscosity at 100.degree. C. of 1.5 to 30 cSt; and (B) 0.01 to 5% by weight based on the total weight of the composition of a friction modifier. This composition is very useful as a lubricating oil for use in an automatic transmission or a continuously variable transmission, or as a lubricating oil for use in parts including a wet clutch or a wet brake of an agricultural tractor, etc.

Abstract: An oil composition contains 100 parts by weight of a base oil selected from the group consisting of mineral base oil, synthetic base oil and mixtures thereof, and 0.1 to 20 parts by weight of a hydrogenated oil obtained by hydrogenating an oil selected from the group consisting of coal type tar, oil produced by fractionating coal type tar, a hydrocarbon obtained by thermally cracking petroleum and having a boiling point of not lower than 200.degree. C., a hydrocarbon obtained by catalytically cracking petroleum and having a boiling point of not lower than 200.degree. C., a hydrocarbon obtained by catalytically reforming petroleum and having a boiling point of not lower than 200.degree. C., and mixtures thereof, whereby the hydrogenated oil has the hydrogen-donating properties of not lower than three times the hydrogen-donating properties of the base oil at temperatures of not lower than 350.degree. C.

Abstract: The quality and yield of dewaxed, hydrotreated lube oil base stocks are improved by reducing the top temperature in the hydrotreated lube stripper so as to increase the proportion of heavy kerosene components in the lube oil base stock. The separation system provides for a two stage stripping of the lube oil fraction such that the kerosene fraction stripped from the lube product in the primary product stripper under vacuum is stripped in a second stage stripper at a higher pressure with recycle of the heavy kerosene fraction as a reflux stream to the primary vacuum stripper so that a product with improved viscosity index and flash point is separated in the primary stripper.

Abstract: A substantially non-carcinogenic light lubricant and a process for its production. The process comprises the step of blending an effective amount of a substantially non-tumorigenic vacuum distilled hydrocarbon oil of luricating viscosity with a tumorigenic atmospheric distilled light hydrocarbon oil, the tumorigenic light hydrocarbon oil having an initial boiling point of at least 250.degree. F., wherein the resultant blend is substantially non-carcinogenic and of lubricating viscosity.

Abstract: Disclosed is a refrigerating machine oil composition comprising:(A) 85 to 30% by weight of alkyl benzene having a kinematic viscosity at 40.degree. C. of 30 cSt or more;(B) 5 to 70% by weight of a paraffin-based mineral oil having a kinematic viscosity at 40.degree. C. of 20 to 500 cSt, a pour point of -35.degree. C. or lower, a viscosity index of 60 or more, and a sulfur content of 100 ppm or less; and(C) 1 to 30% by weight of a naphthene-based mineral oil having a kinematic viscosity at 40.degree. C. of 5 to 500 cSt, a pour point of -30.degree. C. or lower, and a sulfur content of 0.05 to 1% by weight, the total sulfur content of said composition being 0.01 to 0.10% by weight.The present composition is excellent in stability, lubricity, compatibility with refrigerants, and low temperature property.

Abstract: A process for preparing a baseoil blend of predetermined coking tendency, and for measuring the effectiveness of additives for reducing coking tendency in baseoils, utilizing the relationship of the content of volatile fractions and how boiling fractions in baseoil to the onset and/or progression of asphaltene formation.

Abstract: Crude oil (one of which is a high fouling crude oil) are blended to maintain the incompatible asphaltene thereof below a predetermined level thereby reducing the fouling tendency of the high fouling crude oil. Paraffinic liquids, LPG's, and condensates may also be blended with crude oil, while monitoring and controlling incompatible asphaltenes thereof.

Abstract: Polysiloxanes of the general formula ##STR1## wherein R.sup.1 is the same or different and represents alkyl or phenyl,R.sup.2 is the same as R.sup.1 or represents the C.sub.n F.sub.2n+1 (CH.sub.2).sub.2 O--, in which n is a whole number from 4 to 16, with the proviso that no more than 90% of R.sup.2 has the meaning of R.sup.1,andx=5 to 100 andy=0 to 10.The polysiloxanes are effective defoamers of preparations containing organic solvents or of crude oil and may be synthesized from preferably equilibrated hydrogensiloxanes by reaction with C.sub.n F.sub.2n+1 (CH.sub.2).sub.2 OH.

Abstract: The present invention relates to a refrigerator oil composition which comprises 70 to 98 wt % of a paraffin base oil having a pour point of not more than -35.degree. C., a sulfur content of not more than 50 ppm (parts per million), and a kinematic viscosity at 40.degree. C. of 5 to 500 cSt (centistrokes) and 30 to 2 wt % of a naphthene base oil having a pour point of not more than -35.degree. C., a sulfur content of 0.05 to 1 wt % and a kinematic viscosity at 40.degree. C. of 5 to 500 cSt, and in which the sulfur content is 0.01 to 0.10 wt %.The refrigerator oil composition of the present invention effectively prevents the formation of valve sludge. The refrigerator oil composition of the present invention is also excellent in anti-wear properties. Furthermore the refrigerator oil composition of the present invention is excellent in stability and baking resistance in the condition that is in contact with the refrigerant (Furon) and further is excellent in low temperature solubility.

Abstract: A lubricating oil composition comprising: (A) a base oil having a naphthene content of at least 30%, an aromatic content of not more than 2%, and a kinematic viscosity at 100.degree. C. of 1.5 to 30 cSt; and (B) 0.01 to 5% by weight based on the total weight of the compositon of a friction modifier. This composition is very useful as a lubricating oil for use in an automatic transmission or a continuously variable transmission, or as a lubricating oil for use in parts including a wet clutch or a wet brake of an agricultural tractor, etc.

Abstract: Compounds of the formula I ##STR1## in which R.sub.1 and R.sub.2, independently, denote alkyl with 1 to 6 carbon atoms, cycloalkyl with 5 to 8 carbon atoms, allyl, methallyl, aralkyl with 5 to 9 carbon atoms, phenyl, 1- or 2-naphthyl, or alkaryl with 7 to 9 carbon atoms, R.sub.2 moreover also denotes hydrogen, R.sub.3 denotes hydrogen, alkyl with 1 to 6 carbon atoms, unsubstituted phenyl or phenyl substituted by one or two chlorine atoms and/or one or two methyl groups, B denotes a hetero atom, the group --OC(O)--, --OC(O)--CH.sub.2 CH.sub.2 -- or a direct bond, m is an integer from 0 to 6, and n is an integer from 1 to 6, are prepared by reaction of a thioglycerol derivative with a carboxylic acid containing the hindered phenol moiety in the presence of an acid and are used as antioxidants and thermal stabilizers for lubricating oils, plastics, resins and other organic substrates.