WO2008050003B1

WO2008050003B1 - Multifunctional lubricating fluid

Info

Publication number: WO2008050003B1
Application number: PCT/FR2007/001729
Authority: WO
Inventors: Jean-Paul Souchez; Bernard-Victor Lamy
Original assignee: Total France; Jean-Paul Souchez; Bernard-Victor Lamy
Priority date: 2006-10-24
Filing date: 2007-10-19
Publication date: 2008-11-20
Also published as: CA2667583A1; CN101578355B; RU2009114887A; EP1916291B1; AR063513A1; EP1916291A1; EP2380952A1; RU2469077C2; ES2666595T3; WO2008050003A3; CA2667583C; WO2008050003A2; US20090270294A1; CN101578355A

Abstract

The invention pertains to multifunctional lubricating fluids for use in the different assemblies of automotive vehicles, mainly the engine, the transmission or a hydraulic circuit, and relates to a lubricant composition containing at least one oil of the groups I to V and a mixture of at least two polymers having a difference of the permanent shearing stability index (PSSI), as measured by the standardised KRL test for 20 hours at 1000°C, of at least 50, and having a viscosity profile such that: (a) at 1000°C, after a 30 cycle Bosch test following the CEC-L- 14-A-93 standard, the viscosity of the final lubricant composition is higher than 9.0 cSt, preferably in range of 9.0 to 12.0 cSt for a 30 grade starting oil, or the viscosity of the final lubricant composition is higher than 12.0 cSt, preferably in range of 12.0 to 15.0 cSt for a 40 grade starting oil; (b) at 1000°C, after a 20 hour KRL test following the CEC-L-45-A-99 standard, the viscosity of the final lubricant composition is higher than 8.5 cSt, preferably in range of 8.5 to 11.0 cSt for a 30 or 40 grade starting oil; and (c) at 400°C, after a 3 hour KRL test following the CEC-L-45-A-99 standard with a test duration down to 3 hours, the viscosity of the final lubricant composition is lower than 51.0 cSt, preferably in range of 41 to 51 cSt for a 30 or 40 grade starting oil.

Claims

AMENDED CLAIMS received by the International Bureau on 25 September 2008 (25.09.2008)

A lubricating composition comprising at least one group I to V oil and a mixture of at least two polymers having a permanent shear stability index difference (PSSI), measured after standardized test KRL 20 hours at 100 ^° C. at least 25, and having a viscosity profile such that

"A) at 100 ^° C. after the Bosch-30 cycles test according to the CEC-L-14-A-93 standard, the viscosity of the final lubricating composition is greater than 9.0 cSt, preferably in the range of 9.0 at 12.0 cSt for an oil starting from grade 30, or the viscosity of the final lubricating composition is greater than 12.0 cSt, preferably in the range of 12.0 to 15.0 cSt for an oil at departure of grade 40, and

Ob) at 100 ⁰ C after KRL -20 hours according to CEC-L-45-A-99 the viscosity of the lubricant composition is in the range of 8.5 to 11, OcSt for a grade starting oil 30 or 40, and

(") At 40 ^° C. after the KRL-3 hours test, according to the CEC-L-45-A-99 standard, the test duration of which is reduced to 3 hours, the viscosity of the lubricating composition is less than 51 cSt, preferably in the range of from 41 to 50 cSt for an oil starting from grade 30 or 40.

A lubricating composition comprising at least one Group I to V base oil, and a mixture of at least two polymers having a difference in Shear Stability Index (PSSI), measured after KRL standard test 20 hours at 100 ⁰ C of at least 25, and having a viscosity profile such that: (1) the viscosity of said composition measured at 100 ⁰ C after ₅ test Bosch-30 cycles according to the CEC-L-14-a standard-93 representative of the engine shear conditions, is between 15.0 and 20.0 cSt for a grade 50; ii) the viscosity of said composition, measured at 100 ^° C. after the 20-hour KRL shear test according to standard CEC-L-45-A-99 representative of shear conditions in the gearbox, is between 11.0 and 14.0 cSt for an oil starting from grade 50

(3) the viscosity of said composition measured at 40 ^° C. after the 3 hour RRL shear test, according to the CEC-L-45-A-99 standard, is between 61 and 75 cSt for a starting oil of grade 50,

3. Lubricating composition according to claim 1 or 2 comprising at least 50% by weight based on the weight of the final composition of at least one oil selected from oils of groups I to V and at least 5%, preferably from 5 to 40%, or even more preferably 5 to 15% by weight relative to the weight of the final composition, of a mixture comprising at least two different polymers of type "A", "B", or "C", each of the polymers of mixture differing from one another in being part of a distinct range of permanent shear stability index (PSSI) such as:

the polymers of type "A" have a permanent shear stability index (PSSI), measured after standardized test KRL 20 hours at 100 ^° C. of less than or equal to 40,

the "B" type polymers have a permanent index of stability in shear (PSSI), measured after standardized test KRL 20 hours at 100 ° C (between 40 and 65 excluded terminals; -Polymers type "C" have a Standing index shear stability (PSSI), measured after the standardized test KRL 20 hours at 100 ⁰ C greater than or equal to 65; said composition wherein at least two polymers have a difference in PSSI measured after the standardized test KRL 20 hours at 100 ⁰ C, at least 25.

The lubricating composition of claim 3 wherein each of the polymers of the blend is obtained from monomeric units of a distinct chemical nature.

A lubricating composition according to claim 3 or 4 wherein each polymer of the mixture is obtained from monomeric units of the same chemical nature, and each polymer of the mixture is differentiated from each other by its belonging to a distinct range of permanent shear stability index (PSSI) measured after standardized test KRL 20 hours at 100 ^° C. and by at least one physicochemical characteristic chosen from the number-average or weight-average molecular mass, the molecular weight distribution of said polymer characterized by the polydispersity index, the morphology of the three-dimensional network of said polymer characterized by its degree of crosslinking and / or branching.

6. Lubricating composition according to one of claims 3 to 5 wherein, in the mixture comprising at least two polymers, the amount of a polymer based on the total weight of the polymer mixture ranges from 10% to 90%.

7. Lubricating composition according to one of claims 3 to 6 wherein the mixture comprises two polymers, one type A and the other type C.

8. Lubricating composition according to claim 7 wherein the ratio by weight of the mixture of the two polymers A / C ranges from 10/90 to 90/10. 9. lubricating composition according to one of claims 3 to 8 further comprising from 5 to 30% by weight relative to the weight of the final composition of a functional additive package and optionally less than 1% by weight, preferably from 0.2% to 0.5% by weight based on the weight of the final composition of a pour point improver. 10. Lubricating composition according to one of claims 3 to 9 wherein the polymers of the mixture are selected from the viscosity-improving type polymers and optionally from the type of pour point-type polymers.

Lubricating composition according to Claim 10, in which the viscosity improving polymers chosen from polyvinyl olefins (PAO) with a kinematic viscosity at 100 ^° C. of greater than 90 cSt, polyisobutenes (PIB),

Polymer Esters, Olefins Copolymers (OCP), homopolymers or copolymers of styrene, butadiene or isoprene, polymethacrylates (PMA).

The lubricating composition of claim 10 wherein the pour point improver polymers are selected from polymethacrylates (PMA).

13. Lubricating composition according to one of claims 3 to 12 wherein the type A polymers are viscosity improving polymers selected from polymethacrylates, polyalphaolefins kinematic viscosity at 100 ⁰ C greater than 90 cSt, polyisobutenes, esters polymers.

M. Lubricating composition according to one of claims 3 to 12 wherein the type C polymers are viscosity improving polymers selected from polymethacrylates, olefin-Co-Polymers, hydrogenated styrene-isoprene copolymers, copolymeric esters. 15. Lubricating composition according to one of claims 3 to 12 wherein the type B polymers are polymers improving polymethacrylate viscosity type.

16. A method of manufacturing a lubricant composition according to one of claims 1 to 15 wherein is incorporated a mixture comprising at least two different polymers in at least one group I to V oil comprising optionally an additive package and optionally a pour point improver.

17. The manufacturing method according to claim 16 of a lubricating composition according to any one of claims 1 to 15 wherein at least one of the polymers of the mixture is a viscosity improver which is incorporated directly into the composition as a separate compound regardless of the additive package.

18. The manufacturing method according to claim 16 of a lubricating composition according to any one of claims 1 to 15 wherein all or part of at least one of the viscosity improving polymers of the mixture is incorporated in the composition as a element of the additive package.

19. A method of manufacture according to claim 16 of a lubricant composition according to one of claims 1 to 15 wherein all or part of at least one of the viscosity improving polymers of the mixture is incorporated into the composition in the form of a thinner. package of additives.

20. Use of a lubricant composition according to any one of claims 1 to 15 as the sole fluid for lubricating various bodies of self-propelled vehicles.

21. Use according to claim 20 wherein the single fluid is used to lubricate at least three bodies of self-propelled vehicles, the engine, the gearbox and the hydraulic system of the vehicle.

22. Use according to claim 20 or 21 wherein the single fluid is also used to lubricate the brake control circuit, the onboard compressor and possibly other secondary organs.