The present invention provides an additive for improving the cold flow properties
of vegetable or animal fuel oil. The additive comprises
A) a copolymer of ethylene and 8-21 mol % of at least one acrylic or vinyl
ester having a C1-C18-alkyl radical and
B) a comb polymer of at least one C8-C16-alkyl ester
of an ethylenically unsaturated dicarboxylic acid and at least one C10-C20-olefin,
wherein the sum Q
##EQU1##
of the molar averages of the carbon chain distributions in the alkyl
side chains of the olefins (monomer 1) and the fatty alcohols (monomer 2) is from
23 to 27. In Q, w1 and w2 are the molar proportions of the
individual chain lengths in the comb polymer from the different monomers 1 and
2, and n1 and n2 are the side chain carbon atom lengths,
excluding comb polymer bonded carbon atoms of monomer 1, and the running variables
i and j are the individual side chain lengths in the particular monomer groups.
|
|
|
