Stabilizing compositions for lubricating oils
OwnerAlan Holt, Gerard Mulqueeninventors
Life of this patent
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Abstract
Stabilising compositions for lubricant base stocks and lubricant formulations are composed of a mixture of (a) at least one aromatic aminic amine antioxidant optionally blended with at least one hindered phenolic antioxidant and (b) at least one neutral organo phosphate or phosphite, optionally blended with at least one acid organo phosphate or phosphite. These stabilising composition mixtures are characterised by their stabilising capacity which is considerably higher than that of either the single antioxidants or the single phosphate or phosphite additives. These stabilising compositions can be used in all fields where the single components of the mixtures are generally used and where deterioration due to oxidation processes takes place.
Claims4
A stabilising composition comprising a mixture of:
- (a) at least one aromatic aminic antioxidant having the general formula:
- 13
- wherein R1 and R2 are the same or different and may be H, an alkyl group with 4 to 9 carbon atoms or an aralkyl group with 8 carbon atoms and m and n are 0 to 2 but m+n is not greater than 3, either alone or optionally blended with at least one hindered phenolic antioxidant selected from those corresponding to one of the following general formulae:
- 14
- wherein R3, R4, R5 and R6 are the same or different and may be an alkyl group with 1 to 4 carbon atoms and X is —S— or —CH2— or —CH2CH2—S—CH2CH2— or —CH2—S—CH2— or —CH2CH2CO2CH2CH2—S—CH2CH2CO2CH2CH2—
- 15
- wherein R7 is an alkyl group with 6 to 20 carbon atoms;
- and
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- with (b) at least one neutral organo phosphate or phosphite optionally mixed with at least one acid organo phosphate or phosphite selected from those corresponding to the following general formulae
- (i) neutral triaryl phosphates:
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- wherein R8, R9 and R10 are the same or different and may be H, CH3, isopropyl or tertiary butyl and m is 0 to 2;
- (ii) neutral trialkyl phosphates:
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- wherein R11, R12 and R13 are all the same and are alkyl groups with 4 to 12 carbon atoms;
- (iii) neutral alkyl aryl phosphates:
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- wherein R14 is different from R15 and R16 and R14 is an alkyl group with 4 to 12 carbon atoms and R15 is phenyl or substituted phenyl with 7 to 10 carbon atoms and R16 may be an alkyl group with 4 to 12 carbon atoms or phenyl or substituted phenyl with 7 to 10 carbon atoms;
- (iv) alkyl acid phosphates:
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- wherein R17 is an alkyl group with 5 to 12 carbon atoms and m is 1 or 2 and n is 1 or 2 but m+n is not greater than 3;
- (v) neutral triaryl phosphites:
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- wherein R18, R19, R20 are the same or different and are H or alkyl with 1 to 9 carbon atoms.
- (vi) neutral trialkyl phosphites
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- wherein R21, R22, and R23 are the same or different and are alkyl groups with 1 to 18 carbon atoms.
- (vii) neutral alkyl aryl phosphites:
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- wherein R24 and R25 are the same or different and are alkyl groups with 1 to 12 carbon atoms or R24 is phenyl or substituted phenyl where R26 is alkyl with 1 to 9 carbon atoms.
- (viii) alkyl acid phosphites:
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- wherein R27 may be an alkyl group with 4 to 18 carbon atoms, phenyl or substituted phenyl with 7 to 10 carbon atoms and m is 1 or 2, n is 1 or 2 but m+n is not greater than 3,
- and wherein the antioxidants and the phosphate(s) and/or phosphite(s) are utilised in a weight ratio from 10:1 to 1:10.
Dependencies are inferred from the claim text.