USE OF AN ADDITIVE FOR IMPROVING THE COLD FLOW PROPERTIES OF A PETROLEUM OIL, PETROLEUM COMPOSITIONS CONTAINING THIS ADDITIVE AND MASTERBATCHES CONTAINING THIS ADDITIVE

摘要

Copolymers of ethylene with vinyl acetate for which the expression VA/6 + B/2.3 - log (MFI) is less than 6.2 are used as a cold-flow improver especially in crude oils. (In the expression B represents methyl groups per 1000 C-atoms as measured by defined nmr method and VA represents % weight of vinyl acetate). Wax containing petroleum oil composition containing such a copolymer and a master batch for forming this composition.