Patent ID: 11905488
Assignee: INFINEUM INTERNATIONAL LIMITED
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A transmission fluid composition comprising:
a major amount of a lubricating oil basestock; and
a minor amount of an additive package comprising:
(i) from 0.05 to 0.5 wt% of a mixture comprising two or more compounds of structures (I):, wherein groups R1, R2 and R3 are independently alkyl groups having 1 to 18 carbon atoms or alkyl groups having 1 to 18 carbon atoms where the alkyl chain is interrupted by a thioether linkage, provided that, in the mixture (i), at least some of groups R1, R2 and R3 are alkyl groups having 1 to 18 carbon atoms in which the alkyl chain is interrupted by a thioether linkage;
(ii) from 0.07 to 0.4 wt% of a compound of structure (II) comprising:, wherein groups R4 and R7 are independently alkyl groups having 1 to 12 carbon atoms and R5 is an alkyl linkage having 2 to 12 carbon atoms;
(iii) a detergent comprising calcium salicylate; and
(iv) a basic nitrogen-containing ashless dispersant comprising one or more compounds of structure (III):, wherein:
R8 and R9 are each independently a hydrocarbon group made by the metallocene-catalyzed polymerization of an α-olefin feedstock consisting essentially of 1-octene, 1-decene, 1-dodecene, or mixtures thereof;
each R10 is independently hydrogen, an acetyl moiety, or a moiety formed by reaction between ethylene carbonate and >N—R10; and
x is from 1 to 10 and is the same for all molecules of structure (III) or is an average of all molecules of structure (III) in a mixture of molecules of structure (III).