Polyoxyisopropylenediamine-acid anhydride-n-alkyl-alkylene diamine 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 reaction product of the process comprising: (i) reacting a disbasic acid anhydride with a polyoxyisopropylenediamine ##STR13## where x is a numeral of about 2 to about 68, thereby forming a maleamic acid; (ii) reacting said maleamic acid with a N-alkyl-alkylene diamine, thereby forming a reaction product and; (iii) recovering said reaction product.

Claim 3

The fuel composition of claim 1, wherein said polyoxyisopropylenediamine has a molecular weight M n ranging from about 230 to about 4000.

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 ##STR14## where R is H, CH 3 -- or C 2 H 5 --.

Claim 6

The fuel composition of claim 1, wherein said N-alkyl-alkylene diamine has the formula R'--NH--R"--NH.sub.2 wherein R' is a (C 8-C 18 ) alkyl, alkaryl, aralkyl, aryl or cycloalkyl hydrocarbon group and R" is a (C 1-C 8 ) alkylene, aralkylene, alkarylene, arylene or cycloalkylene hydrocarbon group.

Claim 7

The fuel composition of claim 1, wherein the minor deposit inhibiting amount ranges from about 0.001 to about 0.1 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 reaction product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR15## where x is a numeral of about 2 to about 68, with a dibasic acid anhydride ##STR16## thereby forming a maleamic acid; (ii) reacting said maleamic acid with an N-alkyl-alkylene diamine R'--NH--R"--NH.sub.2 where R' is a (C 8 -C 18 ) alkyl, alkaryl, aralkyl, aryl or cycloalkyl hydrocarbon group and R" is a (C 1 -C 8 ) alkylene, aralkylene, alkarylene, arylene or cycloalkylene hydrocarbon group, thereby forming a reaction product ##STR17## (iii) recovering said reaction 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 reaction product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR15## where x is a numeral of about 2 to about 68, with a dibasic acid anhydride ##STR16## thereby forming a maleamic acid; (ii) reacting said maleamic acid with an N-alkyl-alkylene diamine R'--NH--R"--NH.sub.2 where R' is a (C 8 -C 18 ) alkyl, alkaryl, aralkyl, aryl or cycloalkyl hydrocarbon group and R" is a (C 1 -C 8 ) alkylene, aralkylene, alkarylene, arylene or cycloalkylene hydrocarbon group, thereby forming a reaction product ##STR17## (iii) recovering said reaction 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 (w)% of a deposit-inhibiting reaction product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR18## where x is a numeral of about 2 to about 68 with a maleic anhydride, thereby forming a maleamic acid ##STR19## (ii) reacting said maleamic acid with N-tallow-1,3-propane diamine, thereby forming a reaction product ##STR20## where R' is a (C 8 -C 18 ) alkyl, alkaryl, aralkyl, aryl or cycloalkyl hydrocarbon group; and (iii) recovering said reaction 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 (w)% of a deposit-inhibiting reaction product of the process comprising: (i) reacting a polyoxyisopropylenediamine ##STR18## where x is a numeral of about 2 to about 68 with a maleic anhydride, thereby forming a maleamic acid ##STR19## (ii) reacting said maleamic acid with N-tallow-1,3-propane diamine, thereby forming a reaction product ##STR20## where R' is a (C 8 -C 18 ) alkyl, alkaryl, aralkyl, aryl or cycloalkyl hydrocarbon group; and (iii) recovering said reaction product.