Turbine Fuel Composition Exhibiting Improved Cold Properties

Abstract

The invention relates to the use of polymers which comprise, in copolymerized form, an α-olefin, an alkenyl ester of a carboxylic acid and an ester of an α,β-unsaturated carboxylic acid as an additive for turbine fuels and in particular as a cold flow improver for turbine fuels, to the turbine fuels additized with these polymers, and to additive packets comprising such copolymers.

1 - 16 . (canceled) 
     
     
         17 : An additive for turbine fuels comprising a polymer which is composed of monomers comprising M1, M2 and, optionally, M3 where M1, M2 and M3 have the following general formulae: 
       
         
           
           
               
               
           
         
         in which 
         R 1  is H or C 1 -C 40 -hydrocarbyl; 
         R 2 , R 3  and R 4  are each independently H or C 1 -C 4 -alkyl; 
         R 5  is unsubstituted C 1 -C 20 -alkyl or, in the case that the polymer does not comprise monomer M3 in copolymerized form, is unsubstituted C 6 -C 20 -alkyl; 
         R 6 , R 7  and R 8  are each independently H or C 1 -C 4 -alkyl; and 
         R 9  is methyl or ethyl. 
       
     
     
         18 : The additive according to  claim 17 , wherein the polymer comprises, in copolymerized form, the monomers M1, M2 and, optionally, M3 in random distribution. 
     
     
         19 : The additive according to  claim 17 , wherein the monomers M1, M2 and M3 are present in the following molar fractions in the polymer:
 M1: from 0.60 to 0.99   M2: from 0.01 to 0.40   M3: 0 to 0.20.   
     
     
         20 : The additive according to  claim 17 , wherein monomer M1 is ethylene. 
     
     
         21 : The additive according to  claim 17 , wherein R 2 , R 3  and R 4  are each H or two of the R 2 , R 3  and R 4  radicals are each H and the other radical is methyl. 
     
     
         22 : The additive according to  claim 17 , wherein R 5  is C 8 -C 2 -alkyl. 
     
     
         23 : The additive according to  claim 22 , wherein R 5  is 2-ethylhexyl or lauryl. 
     
     
         24 : The additive according to  claim 17 , wherein M2 is 2-ethylhexyl acrylate or lauryl acrylate. 
     
     
         25 : The additive according to  claim 17 , wherein M3 is vinyl acetate. 
     
     
         26 : The additive according to  claim 17 , wherein the polymer is used as a cold flow improver. 
     
     
         27 : The additive according to  claim 26 , wherein the polymer decreases the pour point of the turbine fuel mixed therewith. 
     
     
         28 : A turbine fuel composition comprising a major proportion by weight of a turbine fuel and a minor proportion by weight of at least one additive as defined in  claim 17 . 
     
     
         29 : The composition according to  claim 17 , wherein the polymer is used in combination with additional turbine fuel additives. 
     
     
         30 : An additive package comprising at least one polymer as defined in  claim 17  in combination with at least one additional turbine fuel additive and, optionally, at least one diluent.