Exxon Chemical Patents, Inc.

Theodore V Kowalchyn

Ricardo A Bloch

Nicholas Charles Nahas

John B Gardiner

Keith U Ingold

Anthony A Loffredo

Silvio Balestieri

Pauliran Da Silva

Francesco Cerbino

Augusto P Queiroz

Undesirable materials, such as unreacted raw materials and by-products, are stripped from liquid systems by delivering a compressed, inert gas through the pores of a sintered porous sparger element and into the liquid system in the form of very small gas micro bubbles.

Process for stripping liquid systems and sparger system useful therefor

The molecular weight and the thickening efficiency of primarily oil soluble hydrocarbon polymers, such as hydrogenated random copolymers and block copolymers of styrene-isoprene or styrene-butadiene, polyisobutylene, poly-n-butene, low unsaturation butyl rubbers, low unsaturation EPDM rubbers, preferably ethylene-propylene copolymers, of the type which are to be used as viscosity index improver additives or as precursors for dispersants and multi-functional viscosity improver additives for lubricating oils, are reduced by heating and masticating the polymers in the presence of oxygen or air and in the presence of a transition metal catalyst, preferably in the further presence of a peroxide accelerator.

Catalytic process for oxidative, shear accelerated polymer degradation

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Scotch Plains, NJ, United States of America

Theodore V Kowalchyn