Evonik Operations Gmbh

Rohm Gmbh

Rohmax Additives Gmbh

Evonik Rohmax Additives Gmbh

Evonik Oil Additives Gmbh

Wolfgang Tschepat

Markus Scherer

Katrin Schöller

Sarah Lippert

Horst Pennewiss

Klaus Schimossek

Torsten Stoehr

Rene Koschabek

Fabian Ziegler

Alexander Dardin

Klaus Hedrich

Stephan Massoth

Roland Schweder

Markus Weber

Andre Unglert

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

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

The present invention relates to a lubricant composition for a process for reducing the paraffin content of mineral oil compositions, by providing a mineral oil composition with a dewaxing aid, cooling to form a paraffin precipitate and at least partly removing the paraffin precipitate formed. The dewaxing aid used is a copolymer mixture comprising at least three copolymers, the copolymers differing in the composition of the repeat units.

Method for dewaxing mineral oil compositions

The invention relates to graft copolymers produced by radically polymerizing polymerisable monomers and, in addition comprising long-chain ethylenically unsaturated compounds which contain alkyl substitutes, in particular acrylates or methacrylates and monomers with hydrogen bridge donator functions. According to said invention, said hydrogen bridge donator monomer is introduced into a polymer backbone and into graft side branches. The inventive polymers are particularly usable for lubricating oil formulations.

Polymers with h-bridge forming functionalities

The present invention relates to a polymer dispersion having high stability, comprising

Highly stable polymer dispersions and method for the production thereof

What are disclosed are a method for making a concentrated emulsion of an olefin copolymer in a carrier medium suitable for use in oil additives, without previous dissolution of the olefin copolymers, by preparing a solution of an emulsifier of the type

Concentrated emulsions of olefin copolymers

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Darmstadt, Germany

Wolfgang Tschepat