Ethylene-vinyl formate copolymers, process for their...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/02 (2006.01) C08F 218/06 (2006.01) C10L 1/18 (2006.01) C10L 1/197 (2006.01)

Patent

CA 2198762

Copolymer comprising ethylene units and vinyl formate units, the content of free vinyl formate in the polymer preferably being not more than 5000 ppm, based on the weight of the copolymer, a process for its preparation, and its use as flow improver, especially in petroleum distillates, preferably fuel and propellant compositions, especially petroleum middle distillates, and also a fuel and propellant composition comprising a principal quantity of a fuel and propellant and that quantity of a copolymer as above which is effective in improving the flow properties.

L'invention porte sur un copolymère comprenant des motifs éthylène et des motifs formiate de vinyle, dont la teneur en formiate de vinyle libre dans le polymère n'excède pas, préférablement, 5 000 ppm, par rapport au poids du copolymère, sur un procédé pour sa préparation et son utilisation comme agent d'amélioration de l'écoulement, particulièrement dans les distillats de pétrole, préférablement les compositions de combustibles et d'agents propulsifs, particulièrement des distillats intermédiaires du pétrole, et également une composition de combustible et d'agent propulsif comprenant une quantité principale d'un combustible et agent propulsif et une quantité du copolymère susmentionné qui est efficace pour améliorer les propriétés d'écoulement.

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