Diesel fuel and dispersant compositions and methods for making and using same

A diesel fuel additive comprising a mixture of:

• a dispersant and a carrier;
• the dispersant comprises at least one member of the group consisting of polyalkylene succinimides and polyalkylene amines, the polyalkylene succinimides being the reaction product of polyalkylene succinic anhydride and a first amine selected from the group consisting of polyamine, the polyalkylene amine being the reaction product of a polyalkylene moiety and a second amine selected from the group consisting of ammonia, monoamine and polyamine;
• the carrier comprising at least one oxygenate selected from the group consisting of polyalkoxylated ether, polyalkoxylated phenol, polyalkoxylated ester and polyalkoxylated amine, wherein the polyalkoxylated phenol has the Formula VII:
• ##STR25## wherein R.sup.8 is selected from the group consisting of hydrogen and alkyl having from 1 to 12 carbon atoms, each R.sup.9 is independently selected from the group consisting of hydrogen or alkyl having 1 to 6 carbon atoms, w is an integer from 2 to 50;
• wherein
• (a) when the carrier comprises polyalkoxylated amine, the dispersant comprises polyalkylene amine;
• (b) when the dispersant comprises the polyalkylene succinimide, in the absence of the polyalkylene amine, and the carrier comprises polyalkoxylated ether, the additive has an absence of a polymer or copolymer of an olefinic hydrocarbon or an absence of ester;
• (c) when the dispersant is polyalkylene amine in the absence of polyalkylene succinimide and the carrier comprises polyalkoxylated ether then the carrier further comprises at least one member of the group consisting of the polyalkoxylated phenol, and the polyalkoxylated amine;
• and
• (d) when the carrier comprises polyalkoxylated ester, the dispersant comprises polyalkylene amine.

A method for the production of a diesel fuel having injector deposit inhibiting properties comprising the steps of:

• providing a major portion of a pressure ignition engine fuel;
• adding to the pressure ignition engine fuel a minor portion of a dispersant and a carrier;
• the dispersant comprises at least one member of the group consisting of polyalkylene succinimides and polyalkylene amines, the polyalkylene succinimides being the reaction product of polyalkylene succinic anhydride and a first amine selected from the group consisting of polyamine, the polyalkylene amine being the reaction product of a polyalkylene moiety and a second amine selected from the group consisting of monoamine and polyamine;
• the carrier comprising at least one oxygenate selected from the group consisting of polyalkoxylated ether, polyalkoxylated phenol, polyalkoxylated ester and polyalkoxylated amine, wherein the polyalkoxylated phenol has the Formula VII:
• ##STR35## wherein R.sup.8 is selected from the group consisting of hydrogen and alkyl having from 1 to 12 carbon atoms, each R.sup.9 is independently selected from the group consisting of hydrogen or alkyl having 1 to 6 carbon atoms, w is an integer from 2 to 50;
• wherein
• (a) where the carrier comprises polyalkoxylated amine, the dispersant comprises polyalkylene amine;
• (b) when the dispersant comprises the polyalkylene succinimide, in the absence of the polyalkylene amine, and the carrier comprises polyalkoxylated ether, the additive has an absence of a polymer or copolymer of an olefinic hydrocarbon or an absence of ester;
• (c) when the dispersant is polyalkylene amine in the absence of polyalkylene succinimide and the carrier comprises polyalkoxylated ether then the carrier further comprises at least one member of the group consisting of the polyalkoxylated phenol, and the polyalkoxylated amine;
• and
• (d) when the carrier comprises polyalkoxylated ester, the dispersant comprises polyalkylene amine.