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Ashless lubricant compositions for internal combustion engines

专利摘要

In accordance with the present invention, there are provided ashless heavy duty diesel lubricating oil compositions which comprise an oil of lubricating viscosity as the major component and as the minor component (A) at least 3 wt.% of at least one ashless dispersant, (B) at least 2 wt.% of at least one sulfurized alkyl phenol, and (C) at least 0.1 wt.% of at least one organo-sulfur compound of the formula wherein R⁴ and R⁵ are straight or branched chain alkyl, cyclic, alicyclic, aryl, alkylaryl or arylalkyl radicals having from 2 to about 30 carbon atoms, and w and z are numbers from 1 to about 8 wherein the lubricating oil is characterized by a total sulfated ash (SASH) level of less than 0.01 wt.%. ......

基本信息

专利类型:
发明专利
申请/专利号:
EP1988309139
申请日期:
1988-09-30
专利申请人:
埃克森化学专利公司
分类号:
["C10M163/00","C10M141/08","C10M159/16","C10M167/00","C10N30/04","C10N30/10","C10N30/12","C10N40/00","C10N40/25","F02B3/06","F02B75/02","C10N30/00"]
发明/设计人:
FETTERMAN, GLEN PAUL, JR. ， SCHETELICH, ALAN ALVIN
权利要求: 1. An ashless heavy duty diesel engine lubricating oil composition which comprises a major amount of an oil of lubricating viscosity and (A) at least 3 weight percent of at least one ashless dispersant, (B) at least 2 weight percent of at least one sulfurized alkyl phenol, and (C) at least 0.1 weight percent of at least one organo-sulfur compound of the formula wherein R4 and R5 are straight or branched chain alkyl, cyclic, alicyclic, aryl, alkylaryl or arylalkyl radicals having from 2 to 30 carbon atoms, and w and z are numbers from 1 to 8, wherein the lubricating oil is characterized by a total sullated ash (SASH) level of less than 0.01 weight percent. 2. The composition of claim 1 wherein said ashless dispersant comprises at least one member selected from the group consisting of oil soluble salts, amides, imides, oxazolines and esters, and mixtures thereof, of long chain hydrocarbon substituted mono and dicarboxylic acids or their anhydrides wherein said long chain hydrocarbon group is a polymer of a C2 to C10 monoolefin, said polymer having a number average molecular weight of from 700 to 5000. 3. The composition of claim 2 wherein said long chain hydrocarbyl substituted mono or dicarboxylic acid material comprises a polyolefin, substituted with an average of from 0.8 to 2.0 moles, per mole of polyolefin, of a substituent group comprising an alpha or beta-unsaturated C4 to C10 monounsaturated dicarboxylic acid producing material. 4. The composition of claim 3 wherein said alpha or beta- unsaturated C4 to C10 monounsaturated dicarboxylic acid producing material comprises a dicarboxylic acid, or anhydride or ester thereof. 5. The composition of claim 4 wherein said substituent group comprises a member selected from the group consisting of fumaric acid, itaconic acid, maleic acid, maleic anhydride, chloromaleic acid, dimethyl fumarate and chloromaleic anhydride. 6. The composition of claim 2 wherein said long chain hydrocarbyl substituted acid material comprises a polyolefin and substitutent group selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid and cinnamic acid. 7. The composition of claim 1 wherein said ashless dispersant comprises polyisobutenyl succinimide of a polyalkylene polyamine having an average of from 2 to 60 carbon atoms and from 1 to 12 nitrogen atoms per molecule of said polyamine, wherein said polyisobutylene moiety is derived from polyisobutylene having a number average molecular weight of from 800 to 3000. 8. The composition of any of claims 1 to 7, wherein said SASH level is zero. 9. The composition of claim 1 wherein said ashless dispersant comprises the product of (a) a hydrocarbyl substituted C4 to C10 monounsaturated dicarboxylic acid producing material formed by reacting an olefin polymer of C2 to C10 monoolefin having a number average molecular weight of weight of 700 to 5000 and a C4 to C10 monounsaturated acid material, said acid producing material having an average of 0.8 to 2.0 dicarboxylic acid producing moieties, per molecule of said olefin polymer present in the reaction mixture used to form said first acid producing material, and (b) a nucleophilic reactant selected from the group consisting of amines, alcohols, amino-alcohols and mixtures thereof. 10. The composition of claim 9 wherein said nucleophilic reactant comprises an amine. 11. The composition of claim 10 wherein said amine comprises amines containing from 2 to 60 carbon atoms and from 1 to 12 nitrogen atoms per molecule. 12. The composition of claim 11 wherein said amine comprises a polyalkylenepolyamine wherein said alkylene groups contain 2 to 40 carbons and said polyalkylenepolyamine contains from 3 to 9 nitrogen atoms per molecule. 13. The composition of claim 12 wherein said amine comprises polyethylenepolyamine. 14. The composition of claim 10 wherein said amine contains from 3 to 9 nitrogen atoms per molecule, and wherein said hydrocarbyl substituted acid producing material contains succinic moieties wherein from 0.1 to 1.0 mole of said succinic moieties containd in said olefin polymer is reacted per equivalent of said amine. 15. The composition of claim 16 wherein said ashless dispersant is borated and wherein said reaction mixture includes boric acid. 16. The composition of claim 15 wherein said reaction product contains 0.05 to 2.0 weight percent boron. 17. The composition of any of claims 9 to 16 wherein said number average molecular weight of said olefin polymer is from 1500 to 3000, and wherein said amine comprises a polyalkylene polyamine having an average of from 5 to 7 nitrogen atoms per molecule. 18. The composition of any of claims 9 to 17 wherein said olefin polymer comprises polyisobutylene. 19. An additive concentrate which comprises (A) from 10 to 70 weight percent of at least one oil soluble ashless dispersant, (B) from 10 to 40 weight percent of at least one sulfurized alkyl phenol, (C) from 0.5 to 5 weight percent of at least one organo-sulfur compound of the formula wherein R4 and R5 are straight or branched chain alkyl, cyclic, alicyclic, aryl, alklaryl or arylalkyl radicals having from 2 to about 30 carbon atoms, and w and z are numbers from 1 to 8, and from 30 to 80 weight percent base oil, the additive concentrate having a total sulfate ash level (SASH) of less than 0.01 weight %. 20. The use of the lubricating composition of claim 1 in a diesel engine in conjunction with a normally liquid fuel having a sulfur content of less than 1 weight percent. 21. The use of the lubricating composition of claim 1 in a diesel engine provided with at least one tight top land piston. 22. The use according to claim 21 wherein said diesel engine is adapted for use in conjunction with a normally liquid fuel having a sulfur content of less than 1 weight percent. 23. The use of the lubricating composition of claim 1 in a diesel engine provided with a lubricating oil crankcase and at least one tight top land piston. 24. The use according to claim 23 wherein said diesel engine is adapted for use in conjunction with a normally liquid fuel having a sulfur content of less than 1 weight percent.