Polyoxyisopropylenediamine-acid anhydride-polyamine reaction product and motor fuel composition containing same

Claim 2

A fuel composition for an internal combustion engine comprising: (a) a major portion of normally liquid hydrocarbon fuel and (b) a minor amount, as a deposit inhibitor additive, of a condensate product of the process comprising: (i) reacting a dibasic acid anhydride with a polyoxyisopropylenediamine ##STR16## where x is a numeral of about 2 to about 50, thereby forming a maleamic acid; (ii) reacting said maleamic acid with a polyalkylene polyamine, thereby forming a condensate product and; (iii) recovering said condensate product.

Claim 3

The fuel composition of claim 1, wherein said polyoxyisopropylenediamine has a molecular weight M n ranging from about 230 to about 2000.

Claim 4

The fuel composition of claim 1, wherein said polyoxyisopropylenediamine, x is a numeral of about 2 to about 33.

Claim 5

The fuel composition of claim 1, wherein said dibasic acid anhydride has the formula ##STR17## where R is H, CH 3 -- or C 2 H 5 --.

Claim 6

The fuel composition of claim 1, wherein said polyamine has the formula NH.sub.2 --(CH.sub.2 CH.sub.2 NH).sub.n --(CH.sub.2 CH.sub.2).sub.m --NH.sub.2 where n is a numeral of about 0 to 4 and m is a numeral of about 0 to 2.

Claim 7

The fuel composition of claim 1, wherein the minor deposit inhibiting amount ranges from about 0.001 to about 0.01 weight percent of the said reaction product.

Claim 8

The fuel composition of claim 6, wherein the minor deposit-inhibiting amount is about 0.01 to about 0.1 weight percent of said reaction product.

Claim 9

A fuel composition for an internal combustion engine comprising: (a) a major portion of a liquid hydrocarbon having a boiling point of 75° to 450° F. and (b) a minor amount, as a deposit-inhibiting additive of a condensate product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR18## where x is a numeral of about 2 to about 50, with a dibasic acid anhydride ##STR19## thereby forming a maleamic acid; (ii) reacting said maleamic acid with a polyalkylene polyamine NH.sub.2 --(CH.sub.2 CH.sub.2 NH).sub.n --(CH.sub.2 CH.sub.2).sub.m NH.sub.2 where n is 0-4 and m is 0 to 2, preferably 1, thereby foring a condensate product ##STR20## where x is a numeral of about 2 to about 50; n is 0 to 4 and m is 0 to 2; and (iii) recovering said condensate product.

Claim 10

A fuel composition for an internal combustion engine comprising: (a) a major portion of a liquid hydrocarbon having a boiling point of 75° to 450° F. and (b) a minor amount, as a deposit-inhibiting additive of a condensate product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR18## where x is a numeral of about 2 to about 50, with a dibasic acid anhydride ##STR19## thereby forming a maleamic acid; (ii) reacting said maleamic acid with a polyalkylene polyamine NH.sub.2 --(CH.sub.2 CH.sub.2 NH).sub.n --(CH.sub.2 CH.sub.2).sub.m NH.sub.2 where n is 0-4 and m is 0 to 2, preferably 1, thereby foring a condensate product ##STR20## where x is a numeral of about 2 to about 50; n is 0 to 4 and m is 0 to 2; and (iii) recovering said condensate product.

Claim 11

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel having a boiling point of 75° to 450° F. and (b) about 0.01 wt.% of a deposit-inhibiting condensate product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR21## where x is a numeral of about 2 to about 50 with maleic anhydride, thereby forming a maleamic acid ##STR22## (ii) reacting said maleamic acid with diethylene triamine, thereby forming a condensate product ##STR23## and (iii) recovering said condensate product.

Claim 12

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel having a boiling point of 75° to 450° F. and (b) about 0.01 wt.% of a deposit-inhibiting condensate product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR21## where x is a numeral of about 2 to about 50 with maleic anhydride, thereby forming a maleamic acid ##STR22## (ii) reacting said maleamic acid with diethylene triamine, thereby forming a condensate product ##STR23## and (iii) recovering said condensate product.