Polyol-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 a liquid hydrocarbon fuel and (b) a minor amount, as a deposit inhibitor additive, of a reaction product of a process comprising: (i) reacting a dibasic acid anhydride with a polyol of the formula ##STR6## where a+c is about 10 to about 80 and b is about 5 to about 70; thereby forming an ester of maleic acid; (ii) reacting said ester of maleic acid with an N-alkyl-alkylene diamine, thereby forming the reaction product; and (iii) recovering said reaction product.

Claim 3

The fuel composition of claim 1, wherein said polyol has a molecular weight M n ranging from about 800 to about 2000.

Claim 4

The fuel composition of claim 1, wherein said polyol reacts with a dibasic acid.

Claim 5

The fuel composition of claim 3, wherein said dibasic acid anhydride has the formula ##STR7## 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 12 -C 18 ) hydrocarbon group and R" is a (C 3 -C 12 ) hydrocarbon group.

Claim 7

A fuel composition for an internal combustion engine comprising: (a) a major portion of a liquid hydrocarbon fuel having a boiling point of about 75° F. to about 450° F.; and (b) a minor amount, as a deposit-inhibiting additive of a reaction product of the process comprising: (i) reacting a polyol ##STR8## where a+c is about 10 to about 80 and b is about 5 to about 70, with a dibasic acid anhydride ##STR9## where R is H, CH 3 -- or C 2 H 5 --, thereby forming an ester of maleic acid; (ii) reacting said ester of maleic acid with an N-alkyl alkylene diamine R'--NH--R"--NH.sub.2 where R' is a (C 12 -C 18 ) hydrocarbon group and R" is (C 3 -C 12 ) hydrocarbon group, thereby forming a reaction product ##STR10## and (iii) recovering said reaction product.

Claim 8

A fuel composition for an internal combustion engine comprising: (a) a major portion of a liquid hydrocarbon fuel having a boiling point of about 75° F. to about 450° F.; and (b) a minor amount, as a deposit-inhibiting additive of a reaction product of the process comprising: (i) reacting a polyol ##STR8## where a+c is about 10 to about 80 and b is about 5 to about 70, with a dibasic acid anhydride ##STR9## where R is H, CH 3 -- or C 2 H 5 --, thereby forming an ester of maleic acid; (ii) reacting said ester of maleic acid with an N-alkyl alkylene diamine R'--NH--R"--NH.sub.2 where R' is a (C 12 -C 18 ) hydrocarbon group and R" is (C 3 -C 12 ) hydrocarbon group, thereby forming a reaction product ##STR10## and (iii) recovering said reaction product.

Claim 9

A motor fuel composition according to claim 6 containing from about 0.001 to 0.01 weight percent of said reaction product.

Claim 10

A motor fuel composition according to claim 1 containing from about 0.001 to 0.01 weight percent of said reaction product.

Claim 11

The motor fuel composition of claim 1, wherein the process is carried out at a temperature of about 100° C. for about 2 hours.

Claim 12

The motor fuel composition of claim 6, wherein the process is carried out at a temperature of about 100° C. for about 2 hours.