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Lubricating oil compositions

a technology of lubricating oil and composition, applied in the direction of lubricant composition, liquid carbonaceous fuel, fuel, etc., can solve the problems of network formation, deficiency in one or more of the others, and poor thickening efficiency of amorphous ocp

Inactive Publication Date: 2008-04-10
TSE KWOK LEUNG +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0016]Other and further objects, advantages and features of the present invention will be understood by reference to the following specification.

Problems solved by technology

Some polymers are excellent in some of the above properties, but are deficient in one or more of the others.
However, amorphous OCP provide relatively poor thickening efficiency (TE) in oil for a given shear stability index (30-cycle SSI).
Semi-crystalline OCP show improved TE in oil for a given SSI, however, the crystalline nature of such copolymers causes both intermolecular and intramolecular interactions, which leads to network formations.
Formation of such networks causes difficulties in handling of copolymer concentrates, even at room temperature, and interactions between such copolymers and base stocks can lead to poor low temperature viscometric properties, such as high MRV viscosities and scanning Brookfield gelation index values.

Method used

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  • Lubricating oil compositions
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Examples

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Effect test

example 1

[0099]Various polymeric VI improvers and VI improver blends were tested, in the form of a 1 wt. % polymer solution in diluent oil, to determine shear stability index, or SSI (30 cycle; ASTM D6278-98); and thickening efficiency, or TE.

VII-1 is a commercially available star polymer having a number average molecular weight (Mn) of 360,000 and comprising at least 5 arms; each of which is hydrogenated isoprene.

VII-2 is a commercially available star polymer having a number average molecular weight (Mn) of 460,000 and comprising at least 5 arms; each of which is a styrene-hydrogenated isoprene copolymer having a styrene content of about 4 mass %.

VII-3 is a commercially available, Ziegler-Natta catalyzed amorphous OCP having an ethylene-derived content of 46.2 mass % and a number average molecular weight (Mn) of 67,700.

VII-4 is a commercially available, metallocene catalyzed amorphous OCP having an ethylene-derived content of 43.8 mass % and a number average molecular weight (Mn) of 44,800....

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Abstract

Lubricating oil compositions and viscosity index (VI) improver concentrates containing combinations of first polymers that are amorphous ethylene α-olefin copolymers; and second polymers that are star polymers, the arms of which are derived from diene, and optionally vinyl aromatic hydrocarbon monomer, wherein the star polymers have a Shear Stability Index (SSI) of from about 1% to about 35% (30 cycle).

Description

FIELD OF THE INVENTION[0001]The invention is directed to lubricating oil compositions formulated with blended viscosity index improver compositions. More specifically, the present invention is directed to lubricating oil compositions comprising a major amount of oil of lubricating viscosity and a viscosity index improver composition containing at least two polymeric viscosity index improvers, which lubricating oil compositions provide simultaneously improved viscometric properties, particularly at low temperatures, and shear stability performance.BACKGROUND OF THE INVENTION[0002]Lubricating oil compositions for use in crankcase engine oils comprise a major amount of base oil and minor amounts of additives that improve the performance and increase the useful life of the lubricant. Crankcase lubricating oil compositions conventionally contain polymeric components that are used to improve the viscometric performance of the engine oil, i.e., to provide multigrade oils such as SAE 5W-30,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L1/16
CPCC10M143/00C10M143/08C10M2205/022C10N2220/021C10N2220/03C10N2230/02C10M2205/028C10M2205/06C10N2020/04C10N2020/075C10N2030/02
Inventor TSE, KWOK-LEUNGEMERT, JACOBBANSAL, JAI G.
Owner TSE KWOK LEUNG
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