PIB AS HIGH VISCOSITY LUBRICANT BASE STOCK

Abstract

Lubricant composition comprising a polyisobutene polymer having a number average molecular weight of 300-5000 g/mol and at least 60 mol % terminal double bonds based on the total number of double bonds in the polymer, and an ester component and/or an alkylated naphthalene compound having kinematic viscosity in the range of 2 to 15 mm.sup.2/s at 100 C.

Claims

1.-13. (canceled)

14. A lubricant composition comprising a) 9.0 to 94.0 wt % based on the total amount of lubricant composition of a polyisobutene polymer having a number average molecular weight of 300-5000 g/mol according to DIN 55672 and at least 60 mol % terminal double bonds based on the total number of double bonds in the polymer, and b) 5 to 50 wt % based on the total amount of lubricant composition of an ester component having kinematic viscosity according to DIN 51562-1 in the range of 2 to 15 mm.sup.2/s at 100 C., wherein the ratio of the polyisobutene polymer a) to the ester component b) is from 1:12 to 12:1 based on the relative weight of these components in the lubricant composition.

15. The lubricant composition according to claim 14, further comprising 20 to 80 wt % of a base oil component.

16. The lubricant composition according to claim 15, wherein the base oil component comprises a polyalphaolefin and/or a Group II and/or Group III mineral oil.

17. The lubricant composition according to claim 16, wherein the base oil component comprises a polyalphaolefin 4, polyalphaolefin 6 and/or polyalphaolefin 8.

18. The lubricant composition according to claim 17, wherein the base oil component comprises a polyalphaolefin 6.

19. The lubricant composition according to claim 14, wherein the composition does not include an ethylene/propylene copolymer.

20. The lubricant composition according to claim 14, wherein the composition does not include a polyisobutene polymer having less than 60 mol % terminal double bonds.

21. The lubricant composition according to claim 14, wherein the composition does not include a polyalkylmethacrylate.

22. The lubricant composition according to claim 14, wherein the ester component is selected from the group consisting of diisodecyladipate, diisotridecyladipate, di(2-propylheptyl)adipate and trimethylolpropanolcaprylate.

23. The lubricant composition according to claim 14, further comprising an additive component selected from the group consisting of antioxidants, dispersants, foam inhibitors, demulsifiers, seal swelling agents, friction reducers, anti-wear agents, detergents, corrosion inhibitors, extreme pressure agents, metal deactivators, rust inhibitors, pour point depressants and mixtures thereof.

24. The lubricant composition according to claim 23, wherein the additive component is present in an amount of 0.1 to 20 wt % of the total lubricant composition.

25. The lubricant composition according to claim 14, having kinematic viscosity at 40 C. according to DIN 51562-1 of not higher than 110000 mm.sup.2/s.

26. A light duty engine oil, medium duty engine oil, heavy duty engine oil, industrial engine oils, marine engine oils, automotive engine oils, crankshaft oils, compressor oils, refrigerator oils, hydrocarbon compressor oils, very low-temperature lubricating oils and fats, high temperature lubricating oils and fats, wire rope lubricants, textile machine oils, refrigerator oils, aviation and aerospace lubricants, aviation turbine oils, transmission oils, gas turbine oils, spindle oils, spin oils, traction fluids, transmission oils, plastic transmission oils, passenger car transmission oils, truck transmission oils, industrial transmission oils, industrial gear oils, insulating oils, instrument oils, brake fluids, transmission liquids, shock absorber oils, heat distribution medium oils, transformer oils, fats, chain oils, minimum quantity lubricants for metalworking operations, oil to the warm and cold working, oil for water-based metalworking liquids, oil for neat oil metalworking fluids, oil for semi-synthetic metalworking fluids, oil for synthetic metalworking fluids, drilling detergents for the soil exploration, hydraulic oils, in biodegradable lubricants or lubricating greases or waxes, chain saw oils, release agents, moulding fluids, gun, pistol and rifle lubricants or watch lubricants and food grade approved lubricants which the comprises the lubricant composition of claim 14.

Description

EXAMPLES

[0140] Methods

[0141] The terminal double bonds in the highly reactive polyisobutene polymers are defined in the present invention as the double bonds according to the following formula wherein R means the polyisobutene radical.

##STR00001##

[0142] The amount of terminal double bonds in the highly reactive polyisobutenes is determined following the method mentioned in U.S. Pat. No. 5,962,604 using .sup.13C-NMR spectroscopy based on the relative peak areas corresponding to the signals for the C-alpha and C-beta carbon atom (chemical shift of 114.4 ppm and 143.6 ppm), respectively.

[0143] Measurement of the number average molecular weight of polymers mentioned in the present invention has been carried out using the industrial standard DIN 55672.

[0144] The pour point of the lubricant compositions according to the present invention has been determined according to the established industrial standard DIN ISO 3016.

[0145] The various viscosities of the lubricant compositions according to the present invention have been determined following established industry standards:

[0146] The kinematic viscosity at 40 C. and 100 C., respectively, is determined according to the established industrial standard DIN 51562-1.

[0147] Experimental Tests

Test Example 1

[0148]

TABLE-US-00006 Lubricant Inventive examples composition CE-1 IE-1 IE-2 PAO 6 Durasyn 146 Durasyn 146 48.6 wt % 48.2 wt % Ester Synative ES Synative ES Synative ES component DIDA DIDA TMTC 8.0 wt % 8.0 wt % 8.0 wt % Additive Anglamol 6004J Anglamol 6004J Anglamol 6004J component 14.0 wt % 14.0 wt % 3.1 wt % OCP I Lubrizol 8407 Lubrizol 8407 16.7 wt % 17.0 wt % PMA PIB Lubrizol 8406 12.7 wt % HR-PIB Glissopal V1500 Glissopal V 33 12.8 wt % 88.94 wt % Pour point 48 C. 57 C. 54 C. Durasyn 146 is a mixture of polyalphaolefins produced from C12 linear alphaolefin feed stocks having kinematic viscosity of 5.9 mm.sup.2/s at 100 C. (ISO 3104/ASTM D445); Synative ES DIDA (Cognis) is a commercially available diisodecyladipate, a low viscosity ester, having kinematic viscosity of 3.69 mm.sup.2/s at 100 C. (ASTM D445); the pour point is 48 C. (ASTM D97), the viscosity index has a value of 160 (ASTM D2270); Synative ES TMTC (Cognis) is a commercially available trimethylolpropane C8/C10 ester, a low viscosity ester, having kinematic viscosity of 4.3 mm.sup.2/s at 100 C. (DIN 51562-1); the pour point is 55 C. (DIN ISO 3016), the viscosity index has a value of 143 (DIN ISO 2909); Anglamol 6004J (Lubrizol) is a commercially available additive package; Lubrizol 8407 (Lubrizol) is a oligomeric ethylene/propylene copolymer; Lubrizol 8406 (Lubrizol) is a conventional polyisobutene; Glissopal V1500 (BASF SE) is a highly reactive polyisobutene having a kinematic viscosity of 1500 mm.sup.2/s at 100 C. (DIN 51562-1), Mn of 2300 g/mol (GPC); Glissopal V33 (BASF SE) is a highly reactive polyisobutene having a kinematic viscosity of 33 mm.sup.2/s at 100 C. (DIN 51562-1).

[0149] As derivable from the above tests, replacement of the conventional polyisobutene thickener (PIB) by highly reactive polyisobutene polymers (HR-PIB) in conventional lubricant compositions leads to a lubricant composition in which the combination of the low viscosity ester and the highly reactive polyisobutene polymer as thickener component leads to lubricant compositions having exceptionally low pour point.

TABLE-US-00007 Lubricant Comparative example Inventive Example composition CE-2 IE-3 PAO 6 36.94 wt % 31.64 wt % Ester Synative ES DIDA component 8.0 wt % Additive Hitec 307 (Afton) Hitec 307 (Afton) component 5.06 wt % 5.06 wt % OCP I PMA Viscobase 11-520 58.0 wt % PIB HR-PIB Glissopal V 190 55.3 wt % Viscosity increase 6.50% 5.10% at 100 C. in %; ASTM D 2893 A Hitec 307 (Afton) is an industrial gear oil additive package having kinematic viscosity of 13 mm.sup.2/s at 100 C.; Glissopal V190 (BASF SE) is a highly reactive polyisobutene having a kinematic viscosity of 190 mm.sup.2/s at 100 C. (DIN 51562-1) and Mn of 1000 g/mol (GPC); Viscobase 11-520 (Evonik) is a highly concentrated polyalkyl methacrylate in group III oil having kinematic viscosity of 275 mm.sup.2/s at 100 C. (ASTM D445);

[0150] This oxidation test (industrial standard ASTM D 2893 A) of comparative composition CE-2 with inventive lubricant composition IE-3 revealed superior oxidation stability for inventive composition IE-3 (viscosity increase at 100 C. in %):