STABLE EMULSIONS FOR LOWERING THE POUR POINT OF CRUDE OILS AND FOR INHIBITING PARAFFIN DEPOSITION

摘要

Polymer compositions comprising polymers derived from at least two of the three families (i) copolymers of ethylene and of at least one ethylenically unsaturated monomer, for example vinyl acetate (EVA), (ii) ethylene copolymers as .defined in i) grafted with polymers, which are (co)polymers derived from one or more n-alkyl (meth)acrylate monomers, with n ranging from 6 to 40 and preferably from 14 to 30, and optionally from one or more monomers selected from fatty-chain α-olefins (n-alkyl, with n ranging from 6 to 40), vinyl esters, vinylaromatics, vinylpyridines and derivatives thereof, N-vinylpyrrolidone, vinyl esters, vinylaromatics, vinylpyridines and derivatives thereof, N-vinylpyrrolidone, (meth)acrylamides and derivatives thereof, ethylenically unsaturated monocarboxylic and/or dicarboxylic acids or anhydrides or ethylenically unsaturated monocarboxylic and/or dicarboxylic anhydrides; and (iii) (co)polymers of n-alkyl (meth)acrylate and of monomers selected from the following group: fatty-chain a-olefins (n-alkyl, with n ranging from 6 to 40), vinyl esters, vinylaromatics, vinylpyridines and derivatives thereof, N-vinylpyrrolidone, (meth)acrylamides and derivatives thereof, ethylenically unsaturated monocarboxylic and/or dicarboxylic acids or anhydrides or ethylenically unsaturated monocarboxylic and/or dicarboxylic anhydrides, characterized in that they are in the form of a stable emulsion and comprises 5 to 70, preferably 5 to 50 parts by weight of at least two (co)polymers belonging to at least two of the families (i); (ii); and (iii).