US2588970A - Hydraulic fluid composition - Google Patents

Hydraulic fluid composition Download PDF

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US2588970A
US2588970A US121899A US12189949A US2588970A US 2588970 A US2588970 A US 2588970A US 121899 A US121899 A US 121899A US 12189949 A US12189949 A US 12189949A US 2588970 A US2588970 A US 2588970A
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parts
tall oil
alkylene oxide
weight
hydraulic fluid
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US121899A
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Esposito Vito
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R M HOLLINGSHEAD CORP
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R M HOLLINGSHEAD CORP
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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
    • C10M173/00—Lubricating compositions containing more than 10% water
    • C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/02—Water
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • 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
    • C10M2209/109—Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26—Amines
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/102—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon only in the ring
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
    • C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
    • C10M2219/106—Thiadiazoles
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • 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
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/01—Emulsions, colloids, or micelles

Definitions

  • the present invention relates generally to hydraulicfiuids useful for transmitting pressure in closed; systems and it relates more particularly to-a new and useful hydraulic fluid composition containing alkyleneoxide-treated tall oil.
  • one object of the present invention is to provide a new and useful hydraulic fluid composition 'which will overcome the disadvantages of the prior art compositions.
  • a further object is to provide a hydraulic fluid which'will not appreciably corrode, attack or otherwise deleteriously affect the various metallic and non-metallic materials commonly employed in servo systems or hydraulic braking systems or the like. 7
  • the present invention contemplates a new and improved hydraulic fluid composition prepared by reacting tall oil (which is a commercially available oil composed essentially of mixtures of rosin and resin acids a'n'd'fatty acids obtained as a by-product in the treatment of wood-pulp in paper mills) with an alkylene oxide (as for example ethylene oxide or propylene oxide) and thereafter incorporate ing the reaction product into a fluid composition comprising essentially ethylene glycol and water along with small amounts of appropriate and well-known corrosion inhibitors, vaporphase inhibitors and oil-soluble detergents.
  • tall oil which is a commercially available oil composed essentially of mixtures of rosin and resin acids a'n'd'fatty acids obtained as a by-product in the treatment of wood-pulp in paper mills
  • an alkylene oxide as for example ethylene oxide or propylene oxide
  • tall oil is heated to a temperature of about 350 F. to 450 F. in a suitable pressure chamber.
  • Ethylene or propylene oxide under a pressure of about 3000 pounds per square inch is then gradually introduced into the pressure chamber and the pres sure is allowed to rise in the reaction chamber until it exceeds 2000 pounds per square inch, after which it is maintained during the reaction period within the range from about 2000 pounds per square inch to 3000 pounds per square inch.
  • the amount of alkylene oxide introduced is preferably in the range from about 14 moles alkylene oxide per mole of tall oil to about 18 moles alkylene oxide per mole of tall oil.
  • a somewhat improved product may be obtained by a preliminary purification of the tall oil which may be carried out by heating the tall oil with about 1% by weight of maleic acid and then filtering off the precipitated material. Where this preliminary purification step is employed the amount of alkylene oxide is calculated with respect to the amount of purified tall oil introduced into the reaction chamber.
  • the final re action product is obtained by allowing the reaction mixture to cool and then adding a few parts by weight of decolorizing charcoal after which the mixture is stirred and'filtered. The final filtrate is heated to about F. and agitated to drive off substantially all unreacted alkylene oxide.
  • the alkylene oxide-treated tall oil (the exact composition of which is not known but which appears to be an esterified product) is then incorporated into a mixture of ethylene glycol or propylene glycol and water.
  • To the mixture are also added small amounts of one or more in- 3 hibitors such as sodium mercaptobenzothiozole, ortho benzoic ethanolamine, polymethyl'siloxane, Z-amino, 2-methyl, 1-propanol and diisopropylamine nitrite.
  • in- 3 hibitors such as sodium mercaptobenzothiozole, ortho benzoic ethanolamine, polymethyl'siloxane, Z-amino, 2-methyl, 1-propanol and diisopropylamine nitrite.
  • Example I parts by weight of ethylene oxide-treated tall oil is mixed with 45 parts of ethylene glycol and 35 parts of water.
  • the resultnig fluid is an excellent hydraulic fluid which is non-inflammable, and has a pour point of minu 70 F. Itskinematic viscosity is approximately 10.5 centistokes at 130 F., 450 centistokes at -40 F. and 2350 centistokes at minus 65 F.
  • the fluid has a freezing point of about 85 F. and a boiling I point of about 235 F.
  • the fluid is a true solution at all temperatures between the pour point and the boiling point and remains homogeneous throughout this temperature range. The fluid has no appreciable tendency to vaporize at any temperature much below its boiling point so that there is no danger of vapor lock resulting at high-temperature operation.
  • alkylene oxidetreated tall oil is intended to mean the reaction products obtained when tall oil is reacted with an alkylene oxide under conditions of elevated, temperature and elevated pressure.
  • a hydraulicfluid composition comprising a mixture consisting essentially of about 40-50 parts by weight of a glycol, about 30-40 parts by weight Water, and a minor proportion on the order of about 10-20 parts by weight of the product obtained by reacting an alkylene oxide with tall oil at elevated temperature of about 350 F.-450f F. and pressure of about 2000-3000 pounds per square inch, said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and being initially present in proportions of about 14-18 mols alkylene oxide per mol tall oil.
  • a hydraulic fluid composition comprising a mixture consisting essentially of about 40-50' parts by weight of a glycol selected from thegroup which consists of ethylene glycol and propylene glycol, 30-40 parts by WBight water, and 10-20 parts by weight of the product of reaction of about 14-18 mols alkylene oxide with about one mol tall oil, said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at elevated temperature and pressur 3.
  • a hydraulic fluid composition comprising a mixture consisting essentially of about 40-50 parts by weight glycol selected from the group consisting of ethylene glycol and propylene glycol, -40 parts by weight water, and 10-20 parts by weight of the product of reaction of about 14-18 mols of alkylene oxide with about one mol tall oil.
  • said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at average temperatures of about 350 F.-450 F. and at average pressures of about 2000-3000 pounds per square inch.
  • a hydraulic fluid composition compring' a mixture consisting essentiallyof about 45 parts by weight ethylene glycol, parts by weight water, and 15 parts by weight of the product of reaction at 350-450 F. and 2000-3000 pounds. per square inch pressure between ethylene oxide and tall oil in a proportion of about 14-18 mols ethylene oxide per mol tall oil.
  • a hydraulic fluid composition comprising a mixture consisting essentially of about ;--50 parts by weight ethylene glycol, 30-40 parts by weight water, 1-2 parts by weight light mineral oil, and 10-20 parts by weight of the product of reaction of about 14-18 mols ethylene oxide with about one mol tall oil, said alkylene oxideFbeing' selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at average temperatures of about 350 F.-450 F. and at average pressures of about 2000-3000 pounds per square inch.
  • composition as defined in claim 2 further characterized by the fact that the glycol is ethyleno glycol. 'r
  • composition as defined in claim 2 further characterized by the fact that the glycol is propylene glycol.

Description

Patented Mar. 11, 1952 HYDRAULIC FLUID COMPOSIT ION Vito Esposito fladdonHeights, N. J., assignor to R. M. Hollingshead Corporation, Camden, N. L, a corporation of New Jersey No Drawing; Application October 17, 1949, Serial :No. 121,899
- 1 l The present invention relates generally to hydraulicfiuids useful for transmitting pressure in closed; systems and it relates more particularly to-a new and useful hydraulic fluid composition containing alkyleneoxide-treated tall oil.
Gonsiderable work has been done on the problem of developing a suitable pressure-transmitting-fluidfor use inservo-mechanisms and hydraulic; braking systems and the like particularly as they relate to aircraft whereinspecial problems are encountered. Hydraulic fluids having aicastor oil base or a polymer-thickened petroleum base have been employed in aircraft sys tems for some time but these compositions have to swell the various parts made of rubber or the like which are used in pressure-transmitting systems. "Various glycols have heretofore been tested for this. purpose but have proven unsatisfactory due to their extremely high viscosity at the low temperatures (-40 F. and below) which may bezencountered during aircraft operation particularly at high altitudes. Moreover, the cost of the" glycol-base hydraulic fluids heretofore proposed has been excessive due to the factthat they cannot be mixed with Water because glycolwater mixtures do nothave a sufficiently low freezing point to remain liquid at these extremely low temperatures. v
Various water-base hydraulicfluids have also been proposed but have provenunsatisfactory due to their low surface tension which results ins-"marked" tendency of the fluid to leak out through materials which would normally confine a fluid of high surface tension.
Accordingly, one object of the present invention is to provide a new and useful hydraulic fluid composition 'which will overcome the disadvantages of the prior art compositions.
the like which is non-inflammable, which is capable of operating at high unit-pressures, which has a sufficiently low freezing point to permit its use in aircraft and which is capable of maintaining appropriate viscosity and lubricity at both low and high operating temperatures. A further object is to provide a hydraulic fluid which'will not appreciably corrode, attack or otherwise deleteriously affect the various metallic and non-metallic materials commonly employed in servo systems or hydraulic braking systems or the like. 7
Other objects and advantages of the present invention will be apparent from the following detailed description and from the appended claims. Generally speaking, the present invention contemplates a new and improved hydraulic fluid composition prepared by reacting tall oil (which is a commercially available oil composed essentially of mixtures of rosin and resin acids a'n'd'fatty acids obtained as a by-product in the treatment of wood-pulp in paper mills) with an alkylene oxide (as for example ethylene oxide or propylene oxide) and thereafter incorporate ing the reaction product into a fluid composition comprising essentially ethylene glycol and water along with small amounts of appropriate and well-known corrosion inhibitors, vaporphase inhibitors and oil-soluble detergents.
In preparing the tall oil-alkylene oxide reaction product referred to above tall oil is heated to a temperature of about 350 F. to 450 F. in a suitable pressure chamber. Ethylene or propylene oxide under a pressure of about 3000 pounds per square inch is then gradually introduced into the pressure chamber and the pres sure is allowed to rise in the reaction chamber until it exceeds 2000 pounds per square inch, after which it is maintained during the reaction period within the range from about 2000 pounds per square inch to 3000 pounds per square inch. The amount of alkylene oxide introduced is preferably in the range from about 14 moles alkylene oxide per mole of tall oil to about 18 moles alkylene oxide per mole of tall oil. A somewhat improved product may be obtained by a preliminary purification of the tall oil which may be carried out by heating the tall oil with about 1% by weight of maleic acid and then filtering off the precipitated material. Where this preliminary purification step is employed the amount of alkylene oxide is calculated with respect to the amount of purified tall oil introduced into the reaction chamber. The final re action product is obtained by allowing the reaction mixture to cool and then adding a few parts by weight of decolorizing charcoal after which the mixture is stirred and'filtered. The final filtrate is heated to about F. and agitated to drive off substantially all unreacted alkylene oxide.
The alkylene oxide-treated tall oil (the exact composition of which is not known but which appears to be an esterified product) is then incorporated into a mixture of ethylene glycol or propylene glycol and water. To the mixture are also added small amounts of one or more in- 3 hibitors such as sodium mercaptobenzothiozole, ortho benzoic ethanolamine, polymethyl'siloxane, Z-amino, 2-methyl, 1-propanol and diisopropylamine nitrite.
The following examples represent preferred embodiments of the novel hydraulic fluid compositions of the present invention.
Example I parts by weight of ethylene oxide-treated tall oil is mixed with 45 parts of ethylene glycol and 35 parts of water. The resultnig fluid is an excellent hydraulic fluid which is non-inflammable, and has a pour point of minu 70 F. Itskinematic viscosity is approximately 10.5 centistokes at 130 F., 450 centistokes at -40 F. and 2350 centistokes at minus 65 F. The fluid has a freezing point of about 85 F. and a boiling I point of about 235 F. The fluid is a true solution at all temperatures between the pour point and the boiling point and remains homogeneous throughout this temperature range. The fluid has no appreciable tendency to vaporize at any temperature much below its boiling point so that there is no danger of vapor lock resulting at high-temperature operation.
As used in the present specification and the appended claims, the expression alkylene oxidetreated tall oil is intended to mean the reaction products obtained when tall oil is reacted with an alkylene oxide under conditions of elevated, temperature and elevated pressure.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and itis therefore desired that the present embodiments be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention. Having thus described my invention, I claim: 1. A hydraulicfluid composition comprising a mixture consisting essentially of about 40-50 parts by weight of a glycol, about 30-40 parts by weight Water, and a minor proportion on the order of about 10-20 parts by weight of the product obtained by reacting an alkylene oxide with tall oil at elevated temperature of about 350 F.-450f F. and pressure of about 2000-3000 pounds per square inch, said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and being initially present in proportions of about 14-18 mols alkylene oxide per mol tall oil.
2. A hydraulic fluid composition comprising a mixture consisting essentially of about 40-50' parts by weight of a glycol selected from thegroup which consists of ethylene glycol and propylene glycol, 30-40 parts by WBight water, and 10-20 parts by weight of the product of reaction of about 14-18 mols alkylene oxide with about one mol tall oil, said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at elevated temperature and pressur 3. A hydraulic fluid composition comprising a mixture consisting essentially of about 40-50 parts by weight glycol selected from the group consisting of ethylene glycol and propylene glycol, -40 parts by weight water, and 10-20 parts by weight of the product of reaction of about 14-18 mols of alkylene oxide with about one mol tall oil. said alkylene oxide being selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at average temperatures of about 350 F.-450 F. and at average pressures of about 2000-3000 pounds per square inch.
4. A hydraulic fluid composition compring' a mixture consisting essentiallyof about 45 parts by weight ethylene glycol, parts by weight water, and 15 parts by weight of the product of reaction at 350-450 F. and 2000-3000 pounds. per square inch pressure between ethylene oxide and tall oil in a proportion of about 14-18 mols ethylene oxide per mol tall oil.
5. A hydraulic fluid composition comprising a mixture consisting essentially of about ;--50 parts by weight ethylene glycol, 30-40 parts by weight water, 1-2 parts by weight light mineral oil, and 10-20 parts by weight of the product of reaction of about 14-18 mols ethylene oxide with about one mol tall oil, said alkylene oxideFbeing' selected from the class which consists of ethylene oxide and propylene oxide, and said reaction being carried out at average temperatures of about 350 F.-450 F. and at average pressures of about 2000-3000 pounds per square inch.
6. A composition as defined in claim 2, further characterized by the fact that the glycol is ethyleno glycol. 'r
7. A composition as defined in claim 2, further characterized by the fact that the glycol is propylene glycol.
8. A composition as defined in claim 2, further characterized by the fact that the alkylene oxide REFERENCES CITED The following references are of record in the file of this patent:
V UNITED STATES PATENTS Number Name 1 Date.
2,060,110 Paxton Nov. 10, 19 36 2,457,139 Fife et a1 Dec. 28, 1948 2,469,493 arker May 10. 1949

Claims (1)

1. A HYDRAULIC FLUID COMPOSITION COMPRISING A MIXTURE CONSISTING ESSENTIALLY OF ABOUT 40-50 PARTS BY WEIGHT OF A GLYCOL, ABOUT 30-40 PARTS OF WEIGHT WATER, AND A MINOR PROPORTION ON THE ORDER OF ABOUT 10-20 PARTS BY WEIGHT OF THE PRODUCT OBTAINED BY REACTING AN ALKYLENE OXIDE WITH TALL OIL AT ELEVATED TEMPERATURE AN ALKYLENE OXIDE WITH TALL OIL AND PRESSURE OF ABOUT 2000-3000 POUNDS PER SQUARE INCH, SAID ALKYLENE OXIDE BEING SELECTED FROM THE CLASS WHICH CONSISTS OF ETHYLENE OXIDE AND PROPYLENE OXIDE, AND BEING INITIALLY PRESENT IN PROPORTIONS OF ABOUT 14-18 MOLS ALKYLENE OXIDE PER MOL TALL OIL.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2755251A (en) * 1953-07-17 1956-07-17 Atlas Powder Co Hydraulic fluid compositions
US2758976A (en) * 1953-03-09 1956-08-14 Atlas Powder Co Nonflammable hydraulic fluid
US2841560A (en) * 1954-12-02 1958-07-01 Atlas Powder Co Pressure transmitting fluids
US2944976A (en) * 1956-03-19 1960-07-12 Celanese Corp Functional fluids
US2950272A (en) * 1957-03-25 1960-08-23 Visco Products Co Polyoxyalkylene esters of tall oil rosin acids
US3152961A (en) * 1960-10-24 1964-10-13 Monsanto Co Stabilization of organic fluids against radiation decomposition and systems employing same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060110A (en) * 1934-09-07 1936-11-10 Chicago Hydraulic Oil Co Hydraulic pressure fluid
US2457139A (en) * 1946-02-26 1948-12-28 Carbide & Carbon Chem Corp Esters of polyoxyalkylene diols
US2469493A (en) * 1947-07-02 1949-05-10 Atlas Powder Co Synthetic detergent composition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060110A (en) * 1934-09-07 1936-11-10 Chicago Hydraulic Oil Co Hydraulic pressure fluid
US2457139A (en) * 1946-02-26 1948-12-28 Carbide & Carbon Chem Corp Esters of polyoxyalkylene diols
US2469493A (en) * 1947-07-02 1949-05-10 Atlas Powder Co Synthetic detergent composition

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758976A (en) * 1953-03-09 1956-08-14 Atlas Powder Co Nonflammable hydraulic fluid
US2755251A (en) * 1953-07-17 1956-07-17 Atlas Powder Co Hydraulic fluid compositions
US2841560A (en) * 1954-12-02 1958-07-01 Atlas Powder Co Pressure transmitting fluids
US2944976A (en) * 1956-03-19 1960-07-12 Celanese Corp Functional fluids
US2950272A (en) * 1957-03-25 1960-08-23 Visco Products Co Polyoxyalkylene esters of tall oil rosin acids
US3152961A (en) * 1960-10-24 1964-10-13 Monsanto Co Stabilization of organic fluids against radiation decomposition and systems employing same

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