Anti-wear additives for alcohol fuels

Claim 2

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel containing (i) a C 1 -C 2 alcohol and (ii) 0-50 volumes of gasoline per volume of alcohol; and (b) from about 0.003 to about 10.0 (w)% of, as a wear-inhibiting additive, a condensate product of the process comprising: (i) reacting a dibasic acid anhydride with a polyoxyisopropylenediamine ##STR13## where x is a numeral of about 2 to about 68 at 75° to 150° C. for 2 to 4 hours, thereby forming a maleamic acid; (ii) reacting said maleamic acid with an N-alkyl-alkylene diamine at about 60° to 100° C. for about 0.1 to 10.0 hours, 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 100 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 diamine has the formula R'--NH--R"--NH.sub.2 where R' is a C 8 -C 18 hydrocarbon group and R" is a divalent C 1 -C 3 hydrocarbon group.

Claim 7

The fuel composition of claim 1, wherein the minor wear-inhibiting amount ranges from about 0.2 to about 6.0 (w)%.

Claim 8

The fuel composition of claim 1, wherein the minor wear-inhibiting amount is about 0.5 (w)%.

Claim 9

The fuel composition of claim 1, wherein said fuel contains about 0.0001 to about 0.05 (v)% of water.

Claim 10

The fuel composition of claim 8, wherein said fuel contains about 0.04 (v)% of water.

Claim 11

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel containing (i) a C 1 -C 2 alcohol and (ii) 0-50 volumes of gasoline per volume of alcohol; and (b) a minor wear-inhibiting amount of, as a wear-inhibiting additive, a condensate 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 hydrocarbon group and R" is a divalent C 1 -C 3 hydrocarbon group, thereby forming a condensate product ##STR17## where x is a numeral of about 2 to about 68; and (iii) recovering said condensate product.

Claim 12

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel containing (i) a C 1 -C 2 alcohol and (ii) 0-50 volumes of gasoline per volume of alcohol; and (b) a minor wear-inhibiting amount of, as a wear-inhibiting additive, a condensate 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 hydrocarbon group and R" is a divalent C 1 -C 3 hydrocarbon group, thereby forming a condensate product ##STR17## where x is a numeral of about 2 to about 68; and (iii) recovering said condensate product.

Claim 13

The fuel composition of claim 10, wherein the minor wear-inhibiting amount ranges from about 0.003 to about 10.0 (w)%.

Claim 14

The fuel composition of claim 11, wherein the minor wear-inhibiting amount ranges from about 0.2 to about 6.0 (w)%.

Claim 15

The fuel composition of claim 11, wherein the minor wear-inhibiting amount is about 0.5 (w)%.

Claim 16

The fuel composition of claim 10, wherein said fuel contains about 0.0001 to abut 0.05 (v)% of water.

Claim 17

The fuel composition of claim 10, wherein said fuel contains about 0.04 (v)% of water.

Claim 18

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel containing (i) methanol and (ii) 45 volumes of gasoline per volume of methanol; and (b) about 10 (w)% of a wear-inhibiting condensate 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 condensate product ##STR20## and (iii) recovering said condensate product.

Claim 19

A fuel composition for an internal combustion engine comprising: (a) a major portion of a fuel containing (i) methanol and (ii) 45 volumes of gasoline per volume of methanol; and (b) about 10 (w)% of a wear-inhibiting condensate 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 condensate product ##STR20## and (iii) recovering said condensate product.