Societa' Italiana Additivi Per Carburanti S.r.l.

Ausimont S.r.l.

Societa' Italiana Additivi Per Carburanti

Paolo Falchi

Luciano Canova

Ettore Santoro

Enrico Albizzati

Federico Milani

Enrico Dalcanale

Stefanio Bonsignore

Trevor John Russell

Jeremy Burton

Luciano Bonoli

Ethylene polymers with &agr;-olefins

Catalysts suitable for decreasing the cold filter plugging point of middle distillates

Polymerization process to obtain elastomeric copolymers or terpolymers based on ethylene for cold flow improver (CFI) having a viscosimetric average molecular weight ranging between 600 and 16,000. a) The process includes polymerizing monomers in suspension in the presence of an alpha-olefin liquid under reaction conditions, in the presence of an amount of solvent from about 5 to 30% by volume of the reactor volume in the presence of a polymerization catalyst able to give the X.sub.2 and/or X.sub.4 parameters, lower less than or equal to 0.02, X.sub.2 and X.sub.4 representing the fraction of uninterrupted methylenic sequences of 2 and 4 methylenic groups between two successive methyl or methylene groups respectively in the polymeric chain, as compared with the uninterrupted total sequences of methylene groups determined by .sup.13 C-NMR; b) Conveying the reaction slurry into a flash pipe for the evaporation of the unreacted monomers and of minimum quantities of solvent; c) The polymeric part with the quantity of solvent of the same type or different as above, so as to obtain the desired polymer concentrations, and deactivation of the catalyst by bubbling of wet air stream.

Process for preparing ethylene-based polymers having low molecular weight

The filter plugging point and the pour-point at low temperatures of compositions based on liquid hydrocarbons from refining are improved by means of the addition, preferably in solution, of a mixture of an ethylene copolymer with another copolymerizable monomer and of an imidized acrylic polymer.

Compositions of liquid hydrocarbons from refining endowed with improved

The fluidity at low temperatures of compositions based on refinery liquid hydrocarbons can be improved by adding, preferably under solution, [l.sub.4 ]-methacyclophanes with substituents, obtained from the condensation reaction of a resorcin with a product containing an aldehyde group, followed by a reaction with halides of organic acids or alkyl halides.

Compositions of refinery hydrocarbons endowed with improved fluidity at

The fluidity at low temperatures of compositions based on liquid hydrocarbons from refining is improved by the addition, preferably in solution, of ethylene/propylene/(conjugated diene) copolymers or terpolymers, containing 20-55% of propylene, optionally degraded by thermo-oxidation, and structurally characterized by values of at least one of X.sub.2 and X.sub.4 parameters, which are equal to, or lower than, about 0.02, indicative of the absence in the polymeric chain of propylene linking inversions.

Compositions of hydrocarbons from refining, endowed with improved

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Chieti, Italy

Paolo Falchi