Ethylene/vinyl acetate / unsaturated esters terpolymer as additives enhancing the low-temperature resistance of liquid hydrocarbons such as middle distillates and motor fuels or other fuels

Abstract

The disclosure relates to the use as an additive improving the resistance to cold and the filterability of motor fuels, of at least one copolymer including: 78 to 87% in moles of at least one alpha-olefin, preferably at least ethylene, 12 to 18% in moles of at least one vinyl ester, preferably at least vinyl acetate, 1 to 4% in moles of at least one alpha-beta unsaturated mono carboxylic acid ester, preferably at least ethyl-2,hexyl acrylate.

1 . A use as an additive improving the resistance to cold and filterability of motor fuels, of at least one copolymer comprising:
 78 to 87% in moles of at least one alpha-olefin;   12 to 18% in moles of at least one vinyl ester; and   1 to 4% in moles of at least one alpha-beta unsaturated mono carboxylic acid ester.   
     
     
         2 . The use according to  claim 1  of at least one terpolymer comprising:
 78 to 87% in moles of ethylene;   12 to 18% in moles of vinyl acetate; and   1 to 4% in moles of ethyl-2,hexyl acrylate.   
     
     
         3 . The use according to  claim 1  of at least one copolymer with a numerical molecular weight (Mw) measured by GPC comprised between 3,000 and 30,000, and an average numerical molecular weight (Mn) measured by GPC generally comprised between 1,000 and 20,000. 
     
     
         4 . The use according to  claim 1  of at least one copolymer as an additive improving the resistance to cold and filterability without degrading the filter blocking tendency of middle distillates, such as diesel fuels, domestic fuel oils for heating installations (DF), kerosene, aviation fuels, and heavy fuel oils. 
     
     
         5 . The use according to  claim 1  of at least one copolymer as an additive improving the resistance to cold and filterability of motor fuels the sulphur content of which is less than 5,000 ppm, and sulphur-free. 
     
     
         6 . A composition of hydrocarbons comprising a major quantity of a middle distillate with a boiling temperature ranging from 100 to 500° C. and a minority quantity of at least one copolymer comprising:
 78 to 87% in moles of at least one alpha-olefin;   12 to 18% in moles of at least one vinyl ester; and   1 to 4% in moles of at least one alpha-beta unsaturated mono carboxylic acid ester.   
     
     
         7 . The composition according to  claim 6 , wherein it contains 0 to 100% by weight of biodiesel of at least one of animal and vegetable origin. 
     
     
         8 . The composition according to  claim 6 , wherein it is chosen from diesel fuels, domestic fuel oils for heating installations (DF), kerosene, aviation fuels, and heavy fuel oils. 
     
     
         9 . The composition according to  claim 6 , wherein it comprises 10 to 5,000 ppm by weight of the at least one copolymer. 
     
     
         10 . The composition according to  claim 6 , further comprising one or more other additives different from the at least one copolymer, chosen from at least one of: detergents, anti-corrosive agents, dispersants, demulsifiers, anti foam agents, biocides, reodorants, procetane additives, friction modifiers, lubricity additives or anti-friction additives, combustion-promoting agents (catalytic combustion and soot promoters), agents improving the cloud point, pour point, cold filter plugging point, anti-sedimentation agents, anti-wear agents, and conductivity modifying agents.