Stabilized lubricant compositions
AssigneeCiba-Geigy Corporation
InventorsDavid E. Chasan, Patricia R. Wilson
Life of this patent
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Abstract
The instant invention relates to a lubricant composition stabilized against the deleterious effects of heat and oxygen. The composition comprises a triglyceride oil or an oil which is an ester wherein unsaturation is present in either the alcohol moiety or the acid moiety and an effective stabilizing amount of either an N,N-disubstituted aminomethyl-1,2,4-triazole or an N,N-disubstituted aminomethylbenzotriazole; a higher alkyl substituted amide of dodecylene succinic acid; a phenolic antioxidant; and an aromatic amine antioxidant. Further additives can be added to these lubricant formulations.
Claims23
A lubricant composition stabilized against the deleterious effects of heat and oxygen, which composition comprises
- (a)(i) a natural triglyceride oil which is an ester of a straight-chain C.sub.10 to C.sub.22 fatty acid and glycerol, which triglyceride has an iodine number of at least about 9 and not more than about 133 illustrating its degree of unsaturation;
- or
- (ii) a natural or synthetic oil which is an ester wherein unsaturation is present in either the alcohol moiety or the acid moiety or both;
- (b)(i) an effective stabilizing amount of a metal deactivator of the formula ##STR10## wherein R.sub.1 and R.sub.2 are, independently of one another, hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 alkenyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.7 -C.sub.13 aralkyl, C.sub.6 -C.sub.10 aryl, hydroxyl, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, form a 5-, 6- or 7-membered heterocyclic residue, or R.sub.1 and R.sub.2 is each a residue of formula
- R.sub.16 X[(alkylene)O].sub.n (alkylene)-- (II)
- in which X is O, S or N;
- R.sub.16 is hydrogen or C.sub.1 -C.sub.20 alkyl;
- alkylene is a C.sub.1 -C.sub.12 alkylene residue;
- and n is O or an integer from 1 to 6;
- or R.sub.1 has its previous significance and R.sub.2 is a residue of formula ##STR11## or R.sub.2 is a residue of formula (III) as defined above and R.sub.1 is a residue of formula
- --[alkylene].sub.n --N(R.sub.17)--A--[N(R.sub.17).sub.2 ].sub.m(IV)
- in which m is 0 or 1 and, when m is 0, A is a residue of formula (III) and, when m is 1, A is alkylene or C.sub.6 -C.sub.10 arylene, and alkylene and n have their previous significance and R.sub.17 is a residue of formula III, as defined above;
- or
- (ii) a metal deactivator of the formula ##STR12## wherein R.sub.3 and R.sub.4, each independently of the other, are as R.sub.1 and R.sub.2 defined hereinabove;
- and
- R.sub.5 is hydrogen or C.sub.1 -C.sub.12 alkyl;
- (c) an effective stabilizing amount of a higher alkyl substituted amide of dodecylene succinic acid;
- (d) an effective stabilizing amount of a phenolic antioxidant;
- and
- (e) an effective stabilizing amount of an aromatic amine antioxidant.
A process for stabilizing (i) a natural triglyceride oil which is an ester of a straight-chain C.sub.10 to C.sub.22 fatty acid and glycerol, which triglyceride has an iodine number of at least about 9 and not more than about 133;
- or (ii) a natural or synthetic oil which is an ester wherein unsaturation is present in either the alcohol moiety or the acid moiety against the deleterious effects of heat and oxygen, which process comprises the steps of adding to said oil
- (a)(i) an effective stabilizing amount of a metal deactivator of the formula ##STR15## wherein R.sub.1 and R.sub.2 are, independently of one another, hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 alkenyl, C.sub.5 -C.sub.12 cycloalkyl, C.sub.7 -C.sub.13 aralkyl, C.sub.6 -C.sub.10 aryl, hydroxyl, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, form a 5-, 6- or 7-membered heterocyclic residue, or R.sub.1 and R.sub.2 is each a residue of formula
- R.sub.16 X[(alkylene)O].sub.n (alkylene)-- (II)
- in which X is O, S or N;
- R16 is hydrogen or C.sub.1 -C.sub.20 alkyl;
- alkylene is a C.sub.1 -C.sub.12 alkylene residue;
- and n is 0 or an integer from 1 to 6;
- or R.sub.1 has its previous significance and R.sub.2 is a residue of formula ##STR16## or R.sub.2 is a residue of formula (III) as defined above and R.sub.1 is a residue of formula
- --[alkylene].sub.n --N(R.sub.17)--A--[N(R.sub.17).sub.2 ].sub.m(IV)
- in which m is 0 or 1 and, when m is 0, A is a residue of formula (III) and, when m is 1, A is alkylene or C.sub.6 -C.sub.10 arylene, and alkylene and n have their previous significance and R.sub.17 is a residue of formula III, as defined above;
- or
- (ii) a metal deactivator of the formula ##STR17## wherein R.sub.3 and R.sub.4, each independently of the other, are as R.sub.1 and R.sub.2 defined hereinabove;
- and
- R.sub.5 is hydrogen or C.sub.1 -C.sub.12 alkyl;
- and
- (b) an effective stabilizing amount of a higher alkyl substituted amide of dodecylene succinic acid;
- (c) an effective stabilizing amount of a hindered phenolic antioxidant;
- and
- (d) an effective stabilizing amount of an aromatic amine stabilizer.
Dependencies are inferred from the claim text.