润滑科技信息平台

Lubricating composition and method of lubricating an internal combustion engine

专利摘要

The disclosed technology provides a lubricating composition and a method of lubricating an internal combustion engine where the lubricating composition contains an oil of lubricating viscosity, one or more metal-containing, sulfur-free, alkyl-phenol based detergents, an alkaline earth metal sulfonate detergent, a polyisobutenyl succinimide dispersant, and a dispersant viscosity modifier having a number average molecular weight of at least 20,000.The lubricating composition of the present invention can be formulated to have lower HTHS viscosity, and reduced phosphorous content, while providing protection against adhesive wear. ......

基本信息

专利类型:
发明专利
申请/专利号:
US18/205732
申请日期:
2023-06-05
专利申请人:
路博润公司
分类号:
["C10M129/10","C10M135/08","C10M149/12","C10M161/00","C10M137/06"]
发明/设计人:
LOOP, JOHN G. ， RAGUZ, MARY GALIC
权利要求: 1. A low viscosity lubricating composition, comprising:a) an oil having a viscosity of 4.5 to 6.5 cSt;b) up to 0.45 weight percent of one or more metal-containing sulfur-free alkyl-phenol based detergents derived from an alkylphenol in an amount to deliver at least 0.2 weight percent alkylphenol-containing soap to the composition;c) one or more alkaline earth metal sulfonate detergents in an amount to deliver at least 0.8% by weight sulfonate soap to the composition; andd) 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants; ande) 0.2 wt % to 1 wt % of a mixture of dispersant viscosity modifiers , wherein the mixture of dispersant viscosity modifiers comprises at least one low molecular weight dispersant viscosity modifier having a number average molecular weight of less than 10,000 and one high molecular weight dispersant viscosity modifier having a number average molecular weight of at least 45,000 up to 150,000;wherein the lubricating composition contains less than 0.2 wt % of a sulfur-coupled phenate detergent and wherein the lubricating composition has a viscosity of less than 3.5 cP at 150° C.2. The composition of claim 1, wherein the lubricating composition contains less than 0.15 wt % of a sulfur-coupled phenate detergent.3. The composition of claim 1, wherein the high molecular weight dispersant viscosity modifier has a number average molecular weight of 60,000 to 100,000.4. The composition of claim 1, wherein the low molecular weight dispersant viscosity modifier has a number average molecular weight of 9,000 or lower.5. The composition of claim 1, wherein the composition contains 0.2 wt % to 0.8 wt % of the mixture of dispersant viscosity modifiers.6. The composition of claim 1, wherein the sulfur-free alkylphenol-based detergent is selected from alkylene coupled alkylphenol detergents, alkylsalicylate detergents, and combinations thereof.7. The composition of claim 1, further comprising:a metal dialkyl dithiophosphate, wherein about 65 mol % of the alkyl groups have 5 or more carbon atoms, present in an amount to deliver 0.01 to 0.08 weight percent phosphorus to the composition.8. The composition of claim 1, further comprising:a metal dialkyl dithiophosphate, wherein about 75 mol % of the alkyl groups have 5 or more carbon atoms, present in an amount to deliver 0.01 to 0.08 weight percent phosphorus to the composition and wherein the composition comprises 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants.9. A method of lubricating a compression ignition internal combustion engine comprising supplying to the engine a low phosphorus lubricant composition comprising:a) an oil having a viscosity of 4.5 to 6.5 cSt;b) up to 0.45 weight percent of one or more metal-containing sulfur-free alkyl-phenol based detergents in an amount to deliver at least 0.2 weight percent alkylphenol-containing soap to the composition;c) one or more alkaline earth metal sulfonate detergents in an amount to deliver at least 0.8% by weight sulfonate soap to the composition;d) 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants;e) 0.2 wt % to 1 wt % of a mixture of dispersant viscosity modifiers wherein the mixture of dispersant viscosity modifiers comprises at least one low molecular weight dispersant viscosity modifier having a number average molecular weight of less than 10,000 and one high molecular weight dispersant viscosity modifier having a number average molecular weight of at least 45,000 up to 150,000;wherein the composition contains less than 0.2 weight percent of a sulfur-coupled phenate detergent and wherein the lubricant composition has a viscosity of less than 3.5cP at 150° C.10. The method of claim 9, wherein the high molecular weight dispersant viscosity modifier has a number average molecular weight of 60,000 to 100,000 .11. The method of claim 9, wherein the low molecular weight dispersant viscosity modifier has a number average molecular weight of 9,000 or lower.12. The method of claim 9, wherein the lubricant composition contains 0.2 wt % to 0.8 wt % of the mixture of dispersant viscosity modifiers13. The method of claim 9, wherein the sulfur-free alkylphenol-based detergent is selected from alkylene coupled alkylphenol detergents, alkylsalicylate detergents, and combinations thereof14. The method of claim 9, further comprising:a metal dialkyl dithiophosphate, wherein at least about 65 mol % of the alkyl groups have 5 or more carbon atoms, present in an amount to deliver 0.01 to 0.08 weight percent phosphorus to the composition.15. The method of claim 9, further comprising:a metal dialkyl dithiophosphate, wherein at least about 75 mol % of the alkyl groups have 5 or more carbon atoms, present in an amount to deliver 0.01 to 0.08 weight percent phosphorus to the composition and wherein the composition comprises 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants.16. A method of reducing adhesive wear in a compression engine lubricated with a low phosphorus lubricant composition, comprising supplying to the engine a lubricant composition comprising:a) an oil having a viscosity of 4.5 to 6.5 cSt;b) up to 0.45 weight percent of one or more metal-containing sulfur-free detergents derived from an alkylphenol in an amount to deliver at least 0.2 weight percent alkylphenol-containing soap to the composition;c) one or more alkaline earth metal sulfonate detergents in an amount to deliver at least 0.8% by weight sulfonate soap to the composition;d) 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants; ande) 0.1 wt % to 1.2 wt % of a mixture of dispersant viscosity modifiers wherein the mixture of dispersant viscosity modifiers comprises at least one low molecular weight dispersant viscosity modifier having a number average molecular weight of less than 10,000 and one high molecular weight dispersant viscosity modifier having a number average molecular weight of at least 45,000 up to 150,000;wherein the lubricant composition contains less than 0.2 weight percent of a sulfur-coupled phenate detergent and wherein the lubricant composition has a viscosity of less than 3.5cP at 150° C.17. The method of claim 16, wherein the lubricating composition comprises less than 0.15 wt % of a sulfur-coupled phenate detergent.18. The method of claim 16, wherein the high molecular weight dispersant viscosity modifier has a number average molecular weight of 60,000 to 100,000 and the low molecular weight dispersant viscosity modifier has a number average molecular weight of 9,000 or lower.19. The method of claim 16, wherein the sulfur-free alkylphenol-based detergent is selected from alkylene coupled alkylphenol detergents, alkylsalicylate detergents, and combinations thereof.20. The method of claim 16, further comprising:a metal dialkyl dithiophosphate, wherein at least about 75 mol % of the alkyl groups have 5 or more carbon atoms, present in an amount to deliver 0.01 to 0.08 weight percent phosphorus to the composition and wherein the composition comprises 1 wt % to 4 wt % of one or more polyisobutylene succinimide dispersants.