HIGH-VISCOUS LUBRICANT COPOLYMER COMPATIBLE WITH NON-POLAR BASE FLUIDS

摘要

The invention pertains to a lubricant or lubricant additive having a viscosi ty ranging from 200 to 1100 cSt which at the same time is compatible with non-polar base fluids such as poly(.alpha.-olefins), and which comprises a copolymer of an .alpha.-olefin having of from 8 to 18 carbon atoms and a fumaric diester having an aliphatic alcohol as the esterifying component, the copolymer having a weight average molecular weight above approximately 3500, and the esterifying component bei ng C8 to C10 alcohol (linear or branched) or iso-C13 alcohol. Also disclosed is a process for the preparation of the copolymers wherein an .alpha.-olefin having of from 8 to 18 carbon atoms is reacted with a fumaric diester under the influence of a peroxide radical initiator having tertiary alkyl groups while applying a temperature of from 110 .degree. C to 150 .degree. C.