Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing
Patent
1975-04-04
1977-08-02
Wyman, Daniel E.
Fuel and related compositions
Liquid fuels
Aluminum or heavy metal, other than lead, containing
44 70, C10L 120
Patent
active
040393011
ABSTRACT:
Novel gasoline compositions comprising gasoline and dissolved or dispersed therein small quantities of from about 0.5 to about 100 parts by weight of a driveability-enhancing fluorine-containing polymer per million parts of gasoline will, after carburetion in a multicylinder automobile engine, plate out a fluoropolymeric deposit on the interior surfaces of the intake manifold of the engine thereby establishing on the manifold metal surface a coating of low wettability by any hydrocarbon gasoline component, either aliphatic or aromatic, and significantly improving the driveability performance of the engine. The driveability-enhancing fluorine-containing polymers useful in the gasoline compositions of the invention are characterized in that they must (1) have a critical surface tension of <17 dynes/centimeter at 25.degree. C, (2) have a high contact angle of at least 40.degree. to toluene at 22.degree. C, (3) contain fluorine in the range of from about 20 to about 65% by weight and (4) have a minimum solubility in gasoline of at least about 5 parts by weight per million. Illustrative examples of fluorine-containing polymers which have these properties and are useful in the compositions include homopolymers of esters of fluorine-containing alcohol and monoethylenically unsaturated lower monocarboxylic or corresponding thio acid or copolymers of said fluorine-containing esters and a monoethylenically unsaturated non-fluorinated monomer selected from the group consisting of acrylic acid derivatives, alpha-olefins and other vinyl compounds. Also a method is provided for improving the driveability of an automobile by operating its internal combustion engine on the above novel gasoline compositions.
REFERENCES:
patent: 2680717 (1954-06-01), Little, Jr.
patent: 3207730 (1965-09-01), Guenthner
patent: 3784362 (1974-01-01), Siegart et al.
patent: 3793266 (1974-02-01), Bialy et al.
patent: 3847887 (1974-11-01), Siegart et al.
Geller Henry C.
Harris-Smith Mrs. Y.
Jecminek Albert A.
Reper Ronald R.
Shell Oil Company
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