Evonik Operations Gmbh

Sarah Lippert

Katrin Schöller

Klaus Schimossek

Stefan Maier

Wolfgang Tschepat

Fabian Ziegler

Katrin SCHÖLLER

Mara Doerfel

A novel process can be used for the preparation of polyalkyl (meth)acrylate polymers with improved compositional distribution, which leads to better producibility, solubility, and improved performance of the polymers in lubricant compositions, especially in engine oil formulations.

Process for the preparation of polyalkyl (meth)acrylate polymers

A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.

Comb polymers for improving Noack evaporation loss of engine oil formulations

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.

Viscosity index improvers with defined molecular weight distributions

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Darmstadt, Germany

Sarah Lippert