Method for improving low-temperature fluidity of lubricating oils using high-and-low-molecular weight polymer additive mixtures

Inactive Publication Date: 2001-12-27
EVONIK ROHMAX ADDITIVES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0045] For the purposes of the present invention, "maintaining low temperature fluidity" means that low-shear rate viscosity, yield stress (MRV TP-1 test) and gel index targets (SBT), as discussed above, are satisfied simultaneously by adding a combination of selected high and low molecular weight polymers to a lubricating oil composition. The method of the present invention provides improved low temperature fluidity by selecting and combinin

Problems solved by technology

The behavior of petroleum oil formulations under cold flow conditions is greatly influenced by the presence of paraffins (waxy materials) that crystallize out of the oil upon cooling; these paraffins significantly reduce the fluidity of the oils at low temperature conditions.
One limitation of the use of pour point depressant polymers is that petroleum base oils from different sources contain varying types of waxy or paraffin materials and not all polymeric pour point depressants are equally effective in reducing the pour point of different petroleum oils, that is, a polymeric pour point depressant may be effective for one type of oil and ine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

provides general information for preparing polymers useful in the present invention; Example 2 provides properties of the untreated formulated oils used to evaluate polymers in lubricating oil compositions of the present invention; Example 3 summarizes composition and performance data on lubricating oil compositions containing the polymers (Tables 1, 1A, 1B and 2). All ratios, parts and percentages (%) are expressed by weight unless otherwise specified, and all reagents used are of good commercial quality unless otherwise specified.

[0047] Abbreviations used in the Examples and Tables are listed below with the corresponding descriptions; polymer additive compositions (#1-#14) are designated by the relative proportions of monomers used and polymers combined.

1 LMA = Lauryl-Myristyl Methacrylate Mixture DPMA = Dodecyl-Pentadecyl Methacrylate Mixture SMA = Cetyl-Stearyl Methacrylate Mixture CEMA = Cetyl-Eicosyl Methacrylate Mixture DDM = Dodecyl Mercaptan SBT = Scanning Brookfield Techn...

Example

EXAMPLE 1

Preparation of [P.sub.1] and [P.sub.2] Polymers

[0048] Typically, the individual [P.sub.1] and [P.sub.2] polymers were prepared according to the following description, representative of a conventional solution polymerization process with appropriate adjustments for desired polymer composition and molecular weight. A monomer mix was prepared containing 131 to 762 parts of CEMA or SMA (6-35%), 1416 to 2047 parts of LMA or DPMA (65-94%), 2.9 parts of tert-butyl peroctoate solution (50% in odorless mineral spirits) and about 9 to 13 parts of DDM. Sixty percent of this mix, 1316 parts, was charged to a nitrogen-flushed reactor. The reactor was heated to a desired polymerization temperature of 110.degree. C. and the remainder of the monomer mix was fed to the reactor at a uniform rate over 60 minutes. Upon completion of the monomer feed the reactor contents were held at 110.degree. C. for an additional 30 min., then 5.9 parts of tert-butyl peroctoate solution (50% in odorless mine...

Example

EXAMPLE 3

Low Temperature Performance Properties

[0051] Tables 1, 1A, 1B and 2 present data indicative of low temperature pumpability performance for polymeric additive combinations useful in the present invention in comparison with the individual polymer additives and combinations of additives outside the scope of the present invention. The data in the tables are Treat Rate (weight % of polymer additive in formulated oil) and the corresponding low-shear rate viscosities, yield stress (at -30.degree. C. or -35.degree. C.) and gel index values in different formulated oils. Low-shear rate viscosities (below 60 Pa.multidot.sec), "zero" pascal yield stress values and gel index values below 12 represent the minimum acceptable target properties.

3TABLE 1 Effect of [P.sub.1] and [P.sub.2] Combinations on Low Temperature Properties in Formulated Oil A Low-Shear Rate Viscosity (MRV TP-1) -35.degree. C. Vis- SBT Treat cosity -35.degree. C. Yield (ASTM D 5133) ID # Rate (Pa.sec) Stress, Pa Gel In...

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Abstract

A method for improving the low temperature fluidity of lubricating oil compositions based on addition to lubricating oils of a mixture of selected high molecular weight and low molecular weight alkyl (meth)acrylate copolymers is disclosed. Combinations of low molecular weight alkyl (meth)acrylate polymers containing zero to 25 weight percent (C16-C24)alkyl (meth)acrylate with high molecular weight alkyl (meth)acrylate polymers containing 25 to 70 weight percent (C16-C24)alkyl (meth)acrylate are especially effective at satisfying different aspects of low temperature fluidity properties simultaneously for a broad range of base oils.

Description

[0001] This invention involves a method for improving overall low temperature fluidity properties of a broad range of lubricating oil compositions based on the addition of mixtures of selected high molecular weight and low molecular weight polymer additives, in particular alkyl (meth)acrylate polymer additives.[0002] The behavior of petroleum oil formulations under cold flow conditions is greatly influenced by the presence of paraffins (waxy materials) that crystallize out of the oil upon cooling; these paraffins significantly reduce the fluidity of the oils at low temperature conditions. Polymeric flow improvers, known as pour point depressants, have been developed to effectively reduce the "pour point" or solidifying point of oils under specified conditions (that is, the lowest temperature at which the formulated oil remains fluid). Pour point depressants are effective at very low concentrations, for example, between 0.05 and 1 percent by weight in the oil. It is believed that the...

Claims

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Application Information

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IPC IPC(8): C10M145/14C10M157/00C10M169/04C10N20/02C10N20/04C10N30/02
CPCC10M145/14C10M157/00C10M169/041C10M2203/10C10M2203/1006C10M2203/102C10M2203/1025C10M2203/1045C10M2203/1065C10M2203/1085C10M2205/04C10M2209/04C10M2209/06C10M2209/062C10M2209/084C10M2209/086C10M2213/00C10M2213/04C10M2213/06C10M2217/023C10M2217/024C10M2217/026C10M2217/028C10M2217/06C10N2240/10C10N2240/101C10N2240/104C10N2240/106C10M101/02
Inventor KINKER, BERNARD G.MCGREGOR, THOMAS A.SOUCHIK, JOAN MARIE
Owner EVONIK ROHMAX ADDITIVES GMBH
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