Compositions of hydrocarbons from refining, endowed with improved fluidity at low temperatures
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United States of America Patent
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Mar 17, 1992
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N/A
app pub date -
Jul 7, 1989
filing date -
Jul 8, 1988
priority date (Note) -
Expired
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Abstract
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.
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