Loading patent…
AssigneeExxonMobil Chemical Patents Inc.
InventorsJingwen Zhang, Rainer Kolb, Andy H. Tsou, Periagaram S. Ravishankar, Jo Ann M. Canich, Francis C. Rix
Estimating the term…
This application relates to copolymer compositions and copolymerization processes, as well as to lubricating oil compositions comprising such copolymer compositions as viscosity index improvers, and base oil. The copolymer compositions may be made using two different metallocene catalysts: one capable of producing high molecular weight copolymers; and one suitable for producing lower molecular weight copolymers having at least a portion of vinyl terminations, and the copolymer compositions produced thereby. Copolymer compositions may comprise (1) a first ethylene copolymer fraction having high molecular weight, exhibiting branching topology, and having relatively lower ethylene content (based on the weight of the first ethylene copolymer fraction); and (2) a second ethylene copolymer fraction having low molecular weight, exhibiting linear rheology, and having relatively higher ethylene content (based on the weight of the second ethylene copolymer fraction). Lubricating oil compositions comprising such copolymer compositions may exhibit superior viscosity properties.
A lubricating oil composition comprising a base oil and from 0.1 to 10 wt % of a bimodal ethylene copolymer composition;
A lubricating oil composition comprising (1) a base oil and (2) 1 to 1.5 wt % of a bimodal ethylene copolymer composition, based on the total weight of the lubricating oil composition;
Dependencies are inferred from the claim text.