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Carboxylate-vinyl ester copolymer blend compositions for lubricating oil flow improvement

A kind of lubricating oil composition, technology of flow improver, applied in improved lubricating oil composition, fumaric acid ester, compound of carbon number, improve the flow performance of oily composition specifically engine crankcase lubricating composition, Additives for improving its flow properties, additives for low-temperature flow properties, and lubricating oil compositions, which can solve the problem of no disclosure of binary pour point depressants, etc.

Inactive Publication Date: 2004-08-04
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No dual pour point depressants are disclosed in combination with viscosity index improvers

Method used

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  • Carboxylate-vinyl ester copolymer blend compositions for lubricating oil flow improvement
  • Carboxylate-vinyl ester copolymer blend compositions for lubricating oil flow improvement
  • Carboxylate-vinyl ester copolymer blend compositions for lubricating oil flow improvement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] In group II base material C 12.0 -FVA and C 13.2 -Comparison of FVA with commercially available LOFIs

[0115]A SAE 5W-30 formulation was prepared containing 9.75% of a detergent-inhibitor additive package (comprising the following components: polyisobutenyl succinimide dispersant, calcium sulfonate detergent, zinc dialkyldithiophosphate resistant grinding agent, diarylamine antioxidant), 8.10% viscosity index improver and 82.15% Group II binder. The viscosity index improver consisted of a mixture of 20 wt% ethylene-propylene copolymer containing 50 wt% ethylene and 80 wt% ethylene-propylene copolymer containing 72 wt% ethylene. The base stock has a kinematic viscosity of 22 cSt at 40°C and 4.5 cSt at 100°C, a viscosity index of 118 and a pour point of -18°C. The resulting LOFI-free formulation had a cold start viscosity of 2,500 cP in the CCS test at -25°C and a pour point of -21°C.

[0116] A comparison of the low-temperature performance of various LOFIs is given ...

Embodiment 2

[0124] Formulations containing high-ethylene content olefin copolymer viscosity index improvers

[0125] A SAE 5W-30 formulation was prepared containing 9.75% of the detergent-inhibitor additive package (as described in Example 1), 8.60% of viscosity index improver, and 81.65% of Group II binder. The viscosity index improver is an ethylene-propylene copolymer containing 72 wt% ethylene. The base stock has a kinematic viscosity of 22 cSt at 40°C and 4.5 cSt at 100°C, a viscosity index of 118 and a pour point of -18°C. The resulting LOFI-free formulation had a CCS viscosity of 2,300 cP at -25°C and a pour point of -21°C.

[0126] The use of high ethylene OCPs in such formulations disadvantageously increases the pour point of the lubricating oil. To overcome this pour point disadvantage, the prior art has taught that high- and low-ethylene OCP compositions can be used (see Engel et al. US 3,697,429). But this approach represents a compromise. When adding a low-ethylene OCP to...

Embodiment 3

[0134] In a mixture of Group I and Group III base materials C 12.0 -FVA and C 13.2 -Comparison of FVA with standard LOFIs

[0135] A SAE 5W-30 formulation was prepared containing 8.90% detergent-inhibitor additive package (as described in Example 1), 8.50% viscosity index improver, and 45.43% Group I base and 37.17% Group III Binder. The viscosity index improver consisted of a mixture of 20 wt% ethylene-propylene copolymer containing 50 wt% ethylene and 80 wt% ethylene-propylene copolymer containing 72 wt% ethylene.

[0136] As shown in Table 5, no matter the standard LOFIs (LOFI-1 and LOFI-3 as described above; LOFI-4 is a dialkyl fumarate / vinyl acetate with an average side chain carbon number of 14.0 copolymers), nor combinations thereof, failed to achieve acceptable performance in this base mixture (all failed at yield stress). but C 12.0 -FVA and C 13.2 - Composition of FVA leads to very good low temperature performance.

[0137] ...

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Abstract

Compositions for improving at least the low temperature flow properties of high viscosity index, high saturates, low sulfur lubricating oils (also known as American Petroleum Institute Group II and Group III oils). The compositions comprise a mixture of lubricating oil flow improvers (LOFIs) that are specified first and second component copolymers of unsaturated dicarboxy esters, including a first component which is a polymer or copolymer of a carboxylate containing pendent ester groups wherein the average side chain carbon number is between 11.0 and 12.4, such as dialkyl fumarate / vinyl acetate copolymer, and a second component which also is a polymer or copolymer such as dialkyl fumarate / vinyl acetate copolymer, but wherein the average side chain carbon number is between 12.7 and 15.0. Alternatively, each of the polymers or copolymers can be esterified styrene / maleic anhydride copolymer, or esterified olefin / maleic anhydride copolymer provided that each of the two components has the specified, different average side chain carbon numbers.

Description

Background of the invention [0001] The present invention relates to additives for improving the flow properties of defined oleaginous compositions, in particular lubricating oil compositions, wherein said lubricating oil compositions employ the compounds characterized by the American Petroleum Institute as "Group II" and "Group III" lubricant base stock. More particularly, the present invention relates to additives for improving at least the low temperature flow properties of lubricating oil compositions, and more particularly to a lubricating oil composition comprising an ethylene alpha-olefin copolymerized with a high ethylene content Lubricant oil flow improver in combination with EAO viscosity index improver. And more particularly, the present invention relates to improved lubricating oil compositions including such additives for improving their flow properties. The present invention also relates to a method of improving the flow properties of oily compositions, in parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M157/10C10M101/02C10M143/04C10M143/06C10M143/08C10M143/10C10M143/14C10M145/08C10M145/10C10M145/12C10M145/16C10M169/04C10N20/02C10N20/04C10N30/02C10N30/08
CPCC10M169/041C10M145/16
Inventor R·A·布洛克D·J·马特拉
Owner INFINEUM INT LTD
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