The Dow Chemical Company

K Van Phung

Syamalarao Evani

A hydrophobe associative composition of an ethylenically unsaturated, water-soluble monomer such as acrylamide and an ethylenically unsaturated amphiphilic monomer such as dodecyl poly(oxyethylene).sub.10 methacrylate which is particularly effective for increasing the viscosity of brines or other aqueous media contaning salts or other electrolytes. Such copolymers are therefor useful in mobility control fluids and fracturing fluids for enhanced oil recovery and as drag reduction agents.

Hydrophobie associative composition containing a polymer of a

This invention is a process for the preparation of N-vinyl-2-oxazolidinones which comprises pyrolyzing a N-(1-hydroxyalkyl)-2-oxazolidinone or the N-(1-hydrocarbyloxyalkyl)-2-oxaz olidinone under conditions such that the hydroxy or hydrocarbyloxy moeity is removed to prepared a N-vinyl-2-oxazolidinone.

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Midland, MI, United States of America

K Van Phung