Patent · US Active

Viscosity index improvers

US12234354B2 · kind B2 · utility

0Cited by

7References

6Claims

0Family size

Assignee

Evonik Operations GmbH · DE

Inventors

Tsuyoshi Yuki · Kyoto, JP
Tomohiro Matsuda · Tokyo, JP
Boris Eisenberg · Heppenheim, DE

Key dates

Filing date	Mar 10, 2020
Grant date	Feb 25, 2025
Priority date	—
Expiry date	Mar 10, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10N2040/25
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Polyalkyl(meth)acrylate based polymers which include straight chained C18-24 alkyl(meth)acrylates and have an average carbon number of 7.0 to 7.5 and a weight-average molecular weight of 300,000 g/mol or greater are a useful component for a lubricant composition. Furthermore, lubricant compositions containing such polymers show improved high temperature-high shear performance, especially in engine oil (EO) compositions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.