Low viscosity lubricating oil composition

a lubricating oil and low viscosity technology, applied in the direction of lubricant composition, base materials, additives, etc., can solve the problems of high evaporation loss, increase in oil consumption, and low viscosity of base oils, so as to reduce evaporation loss and improve fuel efficiency of engines

Pending Publication Date: 2021-09-23
CHEVRON JAPAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]In accordance with another embodiment of the present invention, provided is a method of reducing evaporation loss in an internal combustion engine comprising lubricating said engine with a lubricating oil composition comprising: a base oil comprising a diester having one of the following structures:wherein each R is independently selected from the group consisting of C1-C20 saturated or unsaturated alky group and n is an integer from 1 to 8, wherein the diester has a kinematic viscosity at 100° C. of from 2.5 to 3.5 mm2 / s according to ASTM D445 and a viscosity index of from 110 to 175 according to ASTM D2270; and 75 to 500 ppm of boron based on the entire weight of the lubricating oil composition, wherein the boron is provided by one or more boron-containing dispersant.
[0006]In accordance with yet another embodiment of the present invention, provided is a method of improving fuel efficiency of an engine comprising lubricating the engine with a lubricating oil composition comprising: a base oil comprising a diester having one of the following structures:wherein each R is independently selected from the group consisting of C1-C20 saturated or unsaturated alky group and n is an integer from 1 to 8, wherein the diester has a kinematic viscosity at 100° C. of from 2.5 to 3.5 mm2 / s according to ASTM D445 and a viscosity index of from 110 to 175 according to ASTM D2270; and 75 to 500 ppm of boron based on the entire weight of the lubricating oil composition, wherein the boron is provided by one or more boron-containing dispersant.

Problems solved by technology

A disadvantage of low viscosity engine oils is that they can have high volatility which leads to high evaporation loss (meaning an increase in oil consumption).
However, these base oils may not be ideal for low viscosity engine oils such as 0W-12, 0W-8, and 0W-4.

Method used

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  • Low viscosity lubricating oil composition
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  • Low viscosity lubricating oil composition

Examples

Experimental program
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Effect test

example 1

[0103]A lubricating oil composition was prepared by adding 98 wt. % of Bis-2-ethylhexyl azelate base oil and 1.59 wt. % based on the concentrate of a borated polyisobutenyl bis-succcinimide dispersant where the number average molecular weight of the polyisobutene is approximately 1300 providing the finished oil with approximately 0.008 wt. % of boron. The formulation had a NOACK of 17.7% and HTHS 80 of 3.73 mPa·s.

example 2

[0104]A lubricating oil composition was prepared by adding 97 wt. % of Bis-2-ethylhexyl azelate base oil and 3 wt. % based on the concentrate of a borated polyisobutenyl bis-succcinimide dispersant where the number average molecular weight of the polyisobutene is approximately 1300 providing the finished oil with approximately 0.019 wt. % of boron. The formulation had a NOACK of 16.4% and HTHS 80 of 4.01 mPa·s.

example 3

[0105]A lubricating oil composition was prepared by adding 48 wt. % of Bis-2-ethylhexyl azelate base oil, 48 wt. % of Group III base oil (KV 100=4.19, VI=125) and 3 wt. % based on the concentrate of a borated polyisobutenyl bis-succcinimide dispersant where the number average molecular weight of the polyisobutene is approximately 1300 providing the finished oil with approximately 0.019 wt. % of boron. The formulation had a NOACK of 15.9% and HTHS 80 of 4.50 mPa·s.

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Abstract

The present invention generally relates to lubricating oil compositions useful for reducing NOACK volatility in finished lubricating oils of an internal combustion engine. Also disclosed is a method for reducing NOACK volatility in finished lubricating oils in said engine.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to 62 / 992,210 filed Mar. 20, 2020, which is incorporated by reference in its entirety.BACKGROUND OF THE DISCLOSURE[0002]The lubricant industry is actively engaged in research related to improving fuel economy. One well-known way of increasing fuel economy is to decrease the viscosity of lubricating oils. Engine oils that demonstrate excellent fuel economy performance are usually formulated to be low viscosity oils. Viscosity index improvers (VII) are often used to reduce fluid friction from viscosity resistance under low temperature. A disadvantage of low viscosity engine oils is that they can have high volatility which leads to high evaporation loss (meaning an increase in oil consumption).[0003]Attempts to overcome the above problems include formulating with low volatility base oils such as esters and poly-α-olefins. However, these base oils may not be ideal for low viscosity engine oils ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04C10M105/36C10M101/00C10M111/02C10M155/04
CPCC10M169/041C10M105/36C10M101/00C10M111/02C10N2020/02C10M2207/2825C10M2203/003C10M2229/00C10M155/04C10M169/048C10M169/04C10N2060/14C10M2215/28C10M2207/2855C10N2030/54C10N2030/74C10N2030/68C10N2030/02C10N2030/04C10N2040/25
Inventor TANAKA, ISAOHATTORI, TAIKIAKAHORI, WATARU
Owner CHEVRON JAPAN
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