Patent ID: 11905485
Assignee: TOTAL MARKETING SERVICES
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 8:
9. A method for lubricating two-stroke marine engines and four-stroke marine engines, said method comprising applying a marine lubricant composition to internal parts of said marine engine, where said marine lubricant composition comprising:
from 30.0 to 94% of at least one base oil,
from 0.05 to 15.0% of at least one guanidinium-based ionic liquid,
at least one detergent selected from neutral and overbased detergents having a Total Base Number according to ASTM D2896 of from 20 to 450 mg KOH/g

the percentages being defined by weight of component as compared to the total weight of the composition
wherein the guanidinium-based ionic liquid responds to formula (I):

[CAT+][X−]   (I)

wherein
[X−] represents one or more anionic species, [CAT+] is selected from cations of formula (II):, wherein:
R1, R2 are each independently selected from H, a C1-C30 linear or branched alkyl group, a C3-C8 cycloalkyl group, a C6-C12 aryl group, or a C7-C12 aralkyl group, optionally substituted by a functional group comprising an oxygen and/or a nitrogen atom,
R3, R4, R5, R6, are each independently selected from a C1-C30 linear or branched alkyl group, a C3-C8 cycloalkyl group, a C6-C12 aryl group, or a C7-C12 aralkyl group, optionally substituted by a functional group comprising an oxygen and/or a nitrogen atom,
or any two of (R3, R4) or (R5, R6) form together a methylene chain —(CH2)p-, with p is an integer from 2 to 5.