GB1472142A - Combination of naphthol sulphonates and non-metallic detergents as rust inhibitors in lubricating and hydraulic oils - Google Patents

Combination of naphthol sulphonates and non-metallic detergents as rust inhibitors in lubricating and hydraulic oils

Info

Publication number
GB1472142A
GB1472142A GB1322175A GB1322175A GB1472142A GB 1472142 A GB1472142 A GB 1472142A GB 1322175 A GB1322175 A GB 1322175A GB 1322175 A GB1322175 A GB 1322175A GB 1472142 A GB1472142 A GB 1472142A
Authority
GB
United Kingdom
Prior art keywords
naphthol
lubricating
combination
oil
rust inhibitors
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
Application number
GB1322175A
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.)
ExxonMobil Oil Corp
Original Assignee
Mobil Oil Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mobil Oil Corp filed Critical Mobil Oil Corp
Publication of GB1472142A publication Critical patent/GB1472142A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M1/00Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants
    • C10M1/08Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants with additives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02Hydroxy compounds
    • C10M2207/023Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/025Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with condensed rings
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/04Ethers; Acetals; Ortho-esters; Ortho-carbonates
    • C10M2207/044Cyclic ethers having four or more ring atoms, e.g. furans, dioxolanes
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/282Esters of (cyclo)aliphatic oolycarboxylic acids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28Esters
    • C10M2207/34Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/102Polyesters
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/109Polyethers, i.e. containing di- or higher polyoxyalkylene groups esterified
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08Amides
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/08Amides
    • C10M2215/082Amides containing hydroxyl groups; Alkoxylated derivatives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/086Imides
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/20Containing nitrogen-to-oxygen bonds
    • C10M2215/204Containing nitrogen-to-oxygen bonds containing nitroso groups
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    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/26Amines
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28Amides; Imides
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/042Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds between the nitrogen-containing monomer and an aldehyde or ketone
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/043Mannich bases
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/04Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2217/046Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2217/00Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2217/06Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046Overbasedsulfonic acid salts
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00Metal present as such or in compounds
    • C10N2010/04Groups 2 or 12
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/12Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/02Bearings
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/08Hydraulic fluids, e.g. brake-fluids
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/135Steam engines or turbines
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    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10Semi-solids; greasy
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2070/00Specific manufacturing methods for lubricant compositions
    • C10N2070/02Concentrating of additives

Abstract

1472142 Lubricants MOBIL OIL CORP 1 April 1975 [30 May 1974] 13221/75 Heading C5F Rust inhibiting additives for lubricating oils comprises 1-naphthol, 2-naphthol or 1-nitroso-2- naphthol mixed with a sulphonate of a group II metal, e.g. Ba, Sr, Ca, Mg and Zn. The sulphonate may be overbased. The lubricating oil medium may be an hydraulic oil or a turbine oil. The composition may also contain a longchain hydrocarbyl-substituted organic condensation product having 20-300 carbon atoms in the substituent. Suitable products include an ester of an alkenylsuccinic anhydride and an alcohol of 1-4 OH groups, e.g. a polyester of a polybutenylsuccinic anhydride and pentaerythritol. Another suitable product is an alkenylsuccinimide of an ethylenepolyamine of formula H 2 N(C 2 H 4 NH) n -H wherein n is 1 to 10, e.g. a bis-(polybutenylsuccinimide) of tetraethylenepentamine.
GB1322175A 1974-05-30 1975-04-01 Combination of naphthol sulphonates and non-metallic detergents as rust inhibitors in lubricating and hydraulic oils Expired GB1472142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US474495A US3897350A (en) 1974-05-30 1974-05-30 Anti-rust compositions

Publications (1)

Publication Number Publication Date
GB1472142A true GB1472142A (en) 1977-05-04

Family

ID=23883772

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1322175A Expired GB1472142A (en) 1974-05-30 1975-04-01 Combination of naphthol sulphonates and non-metallic detergents as rust inhibitors in lubricating and hydraulic oils

Country Status (11)

Country Link
US (1) US3897350A (en)
JP (1) JPS50159432A (en)
AU (1) AU498950B2 (en)
BE (1) BE829011A (en)
CA (1) CA1037939A (en)
DE (1) DE2523774A1 (en)
FR (1) FR2275548A1 (en)
GB (1) GB1472142A (en)
IT (1) IT1038401B (en)
NL (1) NL7506184A (en)
ZA (1) ZA751282B (en)

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Publication number Priority date Publication date Assignee Title
US3966620A (en) * 1975-08-11 1976-06-29 Mobil Oil Corporation Lubricant compositions
US4100082A (en) * 1976-01-28 1978-07-11 The Lubrizol Corporation Lubricants containing amino phenol-detergent/dispersant combinations
US4107054A (en) * 1977-06-27 1978-08-15 Continental Oil Company Lubricating oil compositions
US4131551A (en) * 1977-08-15 1978-12-26 Standard Oil Company Railway lubricating oil
US4159957A (en) * 1978-06-30 1979-07-03 Chevron Research Company Mannich base dispersant combination
US4159958A (en) * 1978-06-30 1979-07-03 Chevron Research Company Succinate dispersant combination
US4159956A (en) * 1978-06-30 1979-07-03 Chevron Research Company Succinimide dispersant combination
CA1121793A (en) * 1978-06-30 1982-04-13 Louis De Vries Sulfonate dispersant compositions
US4419255A (en) * 1982-02-01 1983-12-06 Texaco Inc. Lubricating oil containing keto amide as friction reducing agent
US4657689A (en) * 1986-04-01 1987-04-14 Texaco Inc. Corrosion-inhibited antifreeze/coolant composition containing hydrocarbyl sulfonate
GB8713549D0 (en) * 1987-06-10 1987-07-15 Exxon Chemical Patents Inc Corrosion inhibiting composition
JP2805207B2 (en) * 1989-04-28 1998-09-30 東燃株式会社 Hydraulic oil composition
JP2922352B2 (en) * 1991-11-27 1999-07-19 日石三菱株式会社 Automatic transmission oil composition
US5449313A (en) * 1992-04-14 1995-09-12 Byelocorp Scientific, Inc. Magnetorheological polishing devices and methods
US6503414B1 (en) 1992-04-14 2003-01-07 Byelocorp Scientific, Inc. Magnetorheological polishing devices and methods
EP0636273B1 (en) * 1992-04-14 1997-08-20 Byelocorp Scientific, Inc. Magnetorheological fluids and methods of making thereof
WO1994004313A1 (en) * 1992-08-14 1994-03-03 Byelocorp Scientific, Inc. Magnetorheological polishing devices and methods
US5353839A (en) * 1992-11-06 1994-10-11 Byelocorp Scientific, Inc. Magnetorheological valve and devices incorporating magnetorheological elements
KR100335219B1 (en) * 1993-06-04 2002-11-07 바이엘로코프 사이언티픽, 인코퍼레이티드 Magnetohydrodynamic fluids and methods of surface preparation, devices and gloss methods using them
GB9505028D0 (en) * 1995-03-13 1995-05-03 Croda Int Plc Explosive compositions
GB2303128B (en) * 1995-03-13 1999-01-13 Croda Int Plc Explosive compositions
US5795212A (en) * 1995-10-16 1998-08-18 Byelocorp Scientific, Inc. Deterministic magnetorheological finishing
TW457295B (en) * 1996-10-29 2001-10-01 Idemitsu Kosan Co A lubricating oil composition for diesel engines
EP0972821A3 (en) * 1998-07-15 2001-04-04 Nippon Mitsubishi Oil Corporation Grease composition suitable for a constant velocity joint
CN102876432B (en) * 2012-09-20 2013-09-25 吴江市天源塑胶有限公司 Corrosion-resistant anti-rust oil
CN103980999A (en) * 2014-04-17 2014-08-13 天长市润达金属防锈助剂有限公司 Lubricating oil-type rust preventive oil
CN103992850A (en) * 2014-04-17 2014-08-20 天长市润达金属防锈助剂有限公司 Environmentally-friendly multi-effect antirust oil
CN103992847A (en) * 2014-04-17 2014-08-20 天长市润达金属防锈助剂有限公司 Rust preventive oil for refrigeration apparatuses
CN103992852A (en) * 2014-04-17 2014-08-20 天长市润达金属防锈助剂有限公司 Volatile rust preventive oil
WO2018000433A1 (en) * 2016-07-01 2018-01-04 深圳市恒兆智科技有限公司 Anti-rust agent, metal workpiece and anti-rust treatment method
CN114149853A (en) * 2021-12-15 2022-03-08 黄山钛可磨工业介质有限公司 Solvent anti-rust oil for forming wet film and preparation process thereof

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Publication number Priority date Publication date Assignee Title
US2691634A (en) * 1951-06-29 1954-10-12 California Research Corp Lubricant composition comprising a mixture of waxy mineral oil, poly-1, 2-oxy-propyleneglycol and a phthalyl chloride acylated tetraparaffin-alkylated phenol
US2833717A (en) * 1956-03-16 1958-05-06 Standard Oil Co Corrosion inhibiting lubricating oil
US2968620A (en) * 1957-10-28 1961-01-17 Standard Oil Co Inhibited soluble-oil
US3235510A (en) * 1962-04-17 1966-02-15 Sinclair Research Inc Emulsified anti-corrosion composition
US3492234A (en) * 1969-01-15 1970-01-27 Mobil Oil Corp Organic compositions containing polyalkylated naphthol
US3554945A (en) * 1969-07-02 1971-01-12 Mobil Oil Corp Lubricating compositions containing alkylated polyhydroxy aromatic compounds

Also Published As

Publication number Publication date
AU498950B2 (en) 1979-03-29
FR2275548A1 (en) 1976-01-16
BE829011A (en) 1975-11-13
IT1038401B (en) 1979-11-20
NL7506184A (en) 1975-12-02
ZA751282B (en) 1976-10-27
US3897350A (en) 1975-07-29
CA1037939A (en) 1978-09-05
JPS50159432A (en) 1975-12-24
DE2523774A1 (en) 1975-12-18
AU8172975A (en) 1976-12-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee