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Hydrogenated Styrene-Butadiene Random Copolymers as Viscosity Index Improvers for Lubricating Oils

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: I.A. Dragomirescu, L. Crisan, S. Balliu

Editorial: 9th Symposium on Lubricants Additives, Waxes & Petroleum Speciality Products, Bombay, India, 1995.


Styrene-butadiene random copolymers were hydrogenated in presence of soluble Ziegler catalysts. Different compositions prepared from organometallic compounds (n-butyl lithium, tri-ethyl aluminum, tri-isobutyl aluminum) and transition metal salts (acetylacetonates, 2-ethylhexanoates, octoates) were investigated. Reaction products were analyzed by GPC, IR and NMR spectroscopy. Hydrogenated random styrene-butadiene copolymers used as viscosity index improvers in multigrade lubricating oils exhibit unusually high thickening power and shear stability at very desirable levels.

Cuvinte cheie: hydrogenated copolymers, soluble catalysts, viscosity index improvers