Composition for low temperature

Abstract

Lubricant composition comprising a dicarboxylic acid ester component which is formed from a dicarboxylic acid selected from the list consisting of adipic acid, phthalic acid, pimilic acid, suberic acid, azelaic acid and sebacic acid, and mixtures thereof and a branched aliphatic alcohol R—OH which is defined according to the following formula (I)whereas q, r and s are defined as follows,q+r=4 to 9,s=0 to 5,q=1 to 8, andr=1 to 6,andan ethylene-propylene copolymer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national stage application (under 35 U.S.C. §371) of PCT / EP2014 / 075816, filed Nov. 27, 2014, which claims benefit of European Application No. 13194911.7, filed Nov. 28, 2013, both of which are incorporated herein by reference in their entirety.DESCRIPTION[0002]The present invention relates to the field of lubricants. The lubricant compositions contain a di-carboxylic acid ester and an ethylene-propylene copolymer. The lubricant compositions can be used in a variety of different oil formulations required in motor vehicles.TECHNICAL BACKGROUND[0003]Commercially available lubricant compositions are based on a multitude of different natural or synthetic components. The resulting properties of the various existing lubricant compositions are tailored to the specific technical requirements by the addition of further components and selected combinations thereof. In this way, lubricant compositions are obtained which can fulf...

AI Technical Summary

Benefits of technology

The present invention relates to a lubricant composition that includes a combination of a dicarboxylic acid ester component and an ethylene-propylene copolymer. This composition has been found to have excellent properties such as low-temperature viscosity, high viscosity index, good fuel efficiency, acceptable seal compatibility, and excellent wear protection. The technical effect of this invention is to provide a lubricant composition that exceeds the performance characteristics of existing lubricant compositions, particularly in extreme conditions.

Problems solved by technology

U.S. Pat. No. 5,451,630 describes the general dilemma when using thickening agents in lubricant compositions because the increase of viscosity is directly related to the molecular weight of the polymeric thickening agent while on the other hand the shear stability decreases due to the greater tendency of breakage under shear and high temperature conditions.

It is particularly difficult to develop lubricant compositions that offer the desired excellent rheological properties at very low temperatures as well as at elevated temperatures.

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