Viscosity index improvers with defined molecular weight distributions

US10731097B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Katrin Schöller · Bad Soden, DE
• Sarah Lippert · Darmstadt, DE
• Wolfgang Tschepat · Darmstadt, DE
• Klaus Schimossek · Bensheim, DE

Key dates

• Filing date: Aug 31, 2018
• Grant date: Aug 4, 2020
• Expiry date: Dec 24, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2070/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Polyalkyl(meth)acrylate based comb polymers with weight-average molecular weights of 700,000 g/mol or greater and number-average molecular weights of 130,000 g/mol or greater can be used to improve the high temperature-high shear performance of lubricant compositions, especially of engine oil (EO) compositions. These polymers can be obtained in a reaction mixture comprising monomers, a dilution oil, and an initiator. The resulting lubricant compositions can have improved kinematic viscosity and high temperature high shear performance.