Abstract: Additives for distillate fuel are a copolymer of (1) an alpha olefin having two to seventeen carbon atoms per molecule or an aromatic substituted olefin having eight to forty carbon atoms per molecule and (2) a mono- or di-alkyl fumarate, itaconate, citraconate, mesaconate, trans- or cis-glutaconate, in which the alkyl group has 8 to 23 carbon atoms.

Abstract: Polymer of number average molecular weight 1,000 to 20,000 containing the repeating units (I) (II) or (III) (II) have been found useful as low temperature flow improvers for distillate fuels particularly in combination with other additives.

Abstract: Copolymers of straight chain alpha olefins and maleic anhydride esterified with an alcohol wherein the alpha olefin is of the formula:R.CH=CH.sub.2and the alcohol is of the formula:R.sup.1 OHin which at least one of R and R.sup.1 is greater than 10 and the sum of R and R.sup.1 is from 18 to 38 and R.sup.1 is linear or contains a methyl branch at the 1 or 2 position have been found to be effective additives for improving the low temperature properties of distillate fuels.

Abstract: Additives suitable for improving the flow and/or depressing the cloud point of crude oils, lubricating oils and especially fuel oils are polymers containing defined alkyl groups of at least 8 carbon atoms chain length. Such polymers are either (a) of a mixture of monomers having only two alkyl groups being at least 3 carbon atoms longer than the other or (b) of a mixture of monomers having only three alkyl groups each differing by at least 3 carbon atoms and the middle alkyl group being half the combined length of the other two. Alternatively, the polymer may be derived from a monomer having the two defined alkyl groups (a) or the three defined alkyl groups (b).