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US 9,284,505 B2Granted
Composition to improve oxidation stability of fuel oils
AssigneeEvonik Oil Additives GmbH
InventorsRonny Sondjaja, Jane Benito, Gwen Teh, Frank-Olaf Mähling
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Abstract
The present invention describes a composition comprising at least one antioxidant and at least one ethylene vinyl acetate copolymer comprising units being derived from at least one alkyl (meth)acrylate having 1 to 30 carbon atoms in the alkyl residue. The composition is useful as cold flow improver and oxidation stabilizer in fossil fuel oil and or biodiesel fuel oil.
Claims15
An additive composition, comprising:
- (a) at least 2% by weight of tert-butylhydroquinone,
- (b) at least 2% by weight of 2,4-di-tert-butylhydroxytoluene,
- (c) at least 10% by weight of a cold flow improver comprising
- at least one polyalkyl(meth)acrylate polymer having a number average molecular weight Mn of from 1000 to 10000 g/mol and a polydispersity Mw/Mn of from 1 to 8, and
- at least one ethylene vinyl acetate graft copolymer having an ethylene vinyl acetate copolymer as graft base and an alkyl (meth)acrylate having 1 to 30 carbon atoms in an alkyl residue as graft layer,
- wherein the weight ratio of said polyalkyl(meth)acrylate polymer to said ethylene vinyl acetate graft copolymer is in the range of from 15:1 to 1:1.
3 more elements
Dependencies are inferred from the claim text.