Evonik Operations Gmbh

Evonik Oil Additives Gmbh

University of Minnesota

Katrin Schöller

Marc Andrew Hillmyer

Klaus Schimossek

Sarah Lippert

Stefan Maier

Fabian Ziegler

Wolfgang Tschepat

Frank-Olaf Mähling

Stefan Hilf

Timothy P Lodge

Jennifer Holtzinger

Stefan Karl Maier

Jürgen Gebhardt

Frank Lauterwasser

Mohammad T Savoji

Dieter Janßen

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

The invention relates to acrylate-olefin copolymers and to a method for preparing these polymers. The present invention is also directed to lubricant compositions comprising these copolymers, and to the use of these copolymers as a lubricant additive or a synthetic base fluid in a lubricating oil composition, preferably in a gear oil composition, a transmission oil composition, a hydraulic oil composition, an engine oil composition, a marine oil composition, an industrial lubricating oil composition or in grease.

Acrylate-olefin copolymers as high viscosity base fluids

Selected comb polymers include specified amounts of macromonomer and imide functionalization. Further, a method is useful for the preparation of such comb polymers. Lubricant compositions including such comb polymers are useful for reducing wear and fuel consumption of lubricant compositions, especially of engine oil (EO) compositions.

Comb polymers comprising imide functionality

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

Polyalkyl(meth)acrylate (PAMA) polymers comprising a certain amount of hydroxyl-functionalized alkyl (meth)acrylates can be used for improving the demulsibility performance of high VI lubricating oil compositions. The lubricating oil compositions can be those which are based on apolar base oils, especially hydraulic fluid compositions. The polymers can be comprised in certain lubricating oil compositions.

Functional polyalkyl (meth)acrylates with enhanced demulsibility performance

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Darmstadt, Germany

Katrin Schöller