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

Claim 19:
20. A transmission fluid composition comprising:
a major amount of a lubricating oil basestock comprising a Group III basestock, a Group IV basestock, or a combination thereof; and
a minor amount of an additive package comprising:
(iv) a basic nitrogen-containing ashless dispersant comprises 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 comprising 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-octadecene, 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);
wherein component (iv) is present in the composition in an amount from 0.75% to 2.0% by mass, based on the total mass of the composition; and
(v) one or more dihydrocarbyl hydrogen phosphite compounds having a structure H—P(═O)—(OR39)2, in which each R39 independently comprises an alkyl group having 12 to 24 carbon atoms,
wherein component (v) provides the composition from 100 to 300 ppm by mass of phosphorous, based on the total mass of the composition; and
wherein the transmission fluid composition comprises no intentionally added components of:
(i) 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) one or more compounds of structures (II) of structures (II):, wherein groups R4 and R7 are independently alkyl groups having 1 to 12 carbon atoms and R5 and R6 are independently alkyl linkages having 2 to 12 carbon atoms;
(iii) a detergent comprising calcium salicylate; and
(iv) a borated polyisobutenyl succinic anhydride (PIBSA)—polyamine (PAM) dispersant.