Lubricant composition for automotive transmission having improved anticorrosion properties
AssigneeTotalenergies Onetech
InventorsGoulven BOUVIER, Hakim EL-BAHI, Sonia YOUNESSE
Life of this patent
Estimating the term…
Abstract
A lubricating composition includes at least one base oil, at least one dispersant and at least one phosphite polymer having formula (I) wherein each of the R1, R2, R3 and R4 can be independently selected from the C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers and Y—OH groups; Y is selected from among the C2-C40 alkylene, C2-C40 alkyl lactone —R7—N(R8)—R9— groups, R7, R8 and R9 are independently selected from among hydrogen, C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers; m is an integer from 2 to 100; and n is an integer from 1 to 1000.
Claims20
A lubricant composition comprising:
- at least one base oil;
- at least one dispersant;
- and
- at least one phosphite polymer of formula (I):
- where:
- each of R1, R2, R3 and R4 can each be independently selected from among the following groups:
- C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers and Y—OH;
- Y is selected from among the following groups:
- C2-C40 alkylene, C2-C40 alkyl lactone, —R7—N(R′)—R9— where R7, R8 and R9 are each independently selected from among hydrogen, C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers,
- m is an integer ranging from 2 to 100;
- and
- n is an integer ranging from 1 to 1000.
A method for improving the anticorrosion properties of a lubricant composition comprising at least one base oil, the method comprising adding a phosphite polymer in combination with a dispersant into the lubricant composition, said phosphite polymer replying to formula (I):
- where:
- each of R1, R2, R3 and R4 can each be independently selected from among the following groups:
- C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers and Y—OH (acting as terminal group);
- Y is selected from among the following groups:
- C2-C40 alkylene, C2-C40 alkyl lactone, —R7—N(R8)—R9— where R7, R8 and R9 are each independently selected from among hydrogen, C1-C20 alkyl, C3-C22 alkenyl, C6-C40 cycloalkyl, C7-C40 cycloalkenyl, C1-20 methoxy alkyl glycol ethers;
- m is an integer ranging from 2 to 100;
- and
- n is an integer ranging from 1 to 1000.
Dependencies are inferred from the claim text.