Additives for improving the cold properties of fuel oils

摘要

#CMT# #/CMT# Additive mixture (I) comprises at least a terpolymer (a) of ethylene, propene and at least an ethylenically unsaturated ester, containing 6-12 mol.% of at least an ethylenically unsaturated ester with 1-3C-alkyl residue derived structural units, 0.5-4 of propene derived methyl group/100-aliphatic carbon-atoms and less than 8 carbon atoms based on methyl group/100-methyl group; and 0.5-20 parts by weight of at least further cold additives (b) for mineral oil such as copolymer of ethylene and ethylenically unsaturated compound, and/or comb polymer. #CMT# : #/CMT# Additive mixture (I) comprises at least a terpolymer (a) of ethylene, propene and at least an ethylenically unsaturated ester, containing 6-12 mol.% of at least an ethylenically unsaturated ester with 1-3C-alkyl residue derived structural units, 0.5-4 of propene derived methyl group/100-aliphatic carbon-atoms and less than 8 carbon atoms based on methyl group/100-methyl group; and 0.5-20 parts by weight of at least further cold additives (b) such as copolymer of ethylene and ethylenically unsaturated compound, whose content is at least 2 mol.% greater than the content of ethylenically unsaturated ester of (a), and/or comb polymer. Independent claims are included for: (1) a preparation of (a) comprising adding a mixture of ethylene, propene and at least a vinyl ester under increased pressure and temperature in the presence of a radical forming initiator, and where the molecular weight of (a) is adjusted by a moderator; (2) a method of improving the fluidity of fuel oil comprising adding (I) to the fuel oil; (3) a composition comprising at least (I) and at least an oil soluble polar nitrogen compound, at least an alkyl phenol-aldehyde resin, olefin polymer or at least a polyoxyalkylene compound; and (4) a fuel oil composition comprising a distillate means and at least (I). #CMT#USE : #/CMT# (I) is useful to improve the cold fluidity of fuel oil (claimed). #CMT#ADVANTAGE : #/CMT# (I) improves the flowability of fuel oil in very low temperature and high concentrated form and is problem-free pumpable, and does not have insoluble part leading to valve clogging and/or filter clogging. (I) improves the solubility of fuel oil even at low temperatures and transports in same temperature with low solvent amount, which reduces the transport- and storage-cost. (I) exhibits improved controllability and application technical characteristics. (I) exhibits low inherent solidifying point than corresponding mixtures based on terpolymer of ethylene, unsaturated ester and higher olefin. #CMT#POLYMERS : #/CMT# Preferred Components: The ethylenically unsaturated ester of (a) is vinyl ester of 1-4C-carboxylic acid, preferably vinyl acetate. The sum (G) of molar content of an unsaturated ester and the amount of the propene derived methyl group/100-aliphatic carbon atoms of the polymer is 8-14. (a) additionally contains 0.3-5 wt.% of at least a moderator containing a carbonyl group derived structural unit. The copolymer of (b) is at least 3 mol.% greater than the ethylenically unsaturated ester of (a). #CMT#EXAMPLE : #/CMT# Typical additive mixture comprised of: ethylene copolymer (85%) (obtained by copolymerizing ethylene, propene (2.1) and vinyl acetate (8.9 mol.%) in 200 MPa at 250[deg]C under the addition of propionaldehyde); and copolymer (15%) of ethylene and vinyl acetate (13.5 mol.%) with a melting viscosity of 150 mPas at 140[deg]C.