Cloud point depressants for middle distillate fuels
AssigneeEquistar Chemicals, LP
InventorMaged G. Botros
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Abstract
An additive for distillate and a fuel composition having improved cloud point depressant properties. The additive is incorporated into a major proportion of distillate fuel and is a maleic anhydride .alpha.-olefin copolymer or a polyimide having the following structure: ##STR1## wherein R has at least 80% by weight of a hydrocarbon substituent from about 14 to about 16 carbons, X is oxygen or ##STR2## wherein N is nitrogen and R' has at least 80% by weight of a hydrocarbon substituent from 16 to 18 carbons, and n is from about 2 to about 30 when X is oxygen, and from about 2 to about 17 when X is ##STR3## Alternatively, the cloud point additive can be an ethylene vinyl acetate isobutylene terpolymer.
Claims7
A distillate fuel composition having improved cloud point depressant properties comprising a major proportion of a distillate fuel and an improved cloud point depressant effective amount of a polyimide having the formula:
- ##STR6## wherein R has at least 80% by weight of a hydrocarbon substituent from about 14 to about 16 carbons, R' has at least 80% by weight of a hydrocarbon substituent from 16 to 18 carbons, and n is from 2 to about 17.
Dependencies are inferred from the claim text.