Additives for lubricating oils having an improved dimensional stability and enhances low temperature performances, and process for the preparation thereof

Additives for lubricating oils having an improved dimensional stability and enhances low temperature performances, and process for the preparation thereof

A process is described for obtaining viscosity index improver compounds (V.I.I.) having an improved dimensional stability and capable of enhancing the low temperature rheology of lubricating oils, the above process comprising the treatment of amorphous EP(D)M copolymers or terpolymers, optionally mi...

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1. Verfasser: TANAGLIA TIZIANO
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Sprache:eng
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CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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description A process is described for obtaining viscosity index improver compounds (V.I.I.) having an improved dimensional stability and capable of enhancing the low temperature rheology of lubricating oils, the above process comprising the treatment of amorphous EP(D)M copolymers or terpolymers, optionally mixed with semi-crystalline EP(D)M, mixed with linear polyethylenes, the treatment being effected in the presence of one or more substances of a hydroperoxide nature and optionally in the presence of small quantities of polyfunctional vinyl monomers, the above treatment being carried out under high shear conditions at a temperature ranging from 75° C. to 260° C., preferably from 140° C. to 210° C.
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subjects CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
title Additives for lubricating oils having an improved dimensional stability and enhances low temperature performances, and process for the preparation thereof
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