Tetrasulfide extreme pressure lubricant additives
First Claim
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1. Tetrasulfide compounds having the structural formula:
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space="preserve" listing-type="equation">R.sup.1 --S--S--S--S--R.sup.2wherein R1 and R2 are each independently selected from the following substituent groups;
##STR4## wherein R1 and R2 are not both --(CH2)17 CH3 ;
wherein r and s are each in the range of 4-10 with the proviso that r+s=15;
wherein w and y are each in the range of 1-8, x is 2 or 3, and z is in the range of 0-8, with the proviso that w+x+y+z=13; and
wherein R3 is hydrogen;
C1 -C5 straight or branched alkyl;
or ##STR5## wherein R4 and R5 are each independently selected from the acyl radicals or C16 -C18 saturated and unsaturated fatty acids, and from the acyl radicals of the mercapto, thiolan, and thiane derivatives of C18 unsaturated fatty acids.
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Abstract
A novel class of compounds has been prepared comprising the tetrasulfides of C18 hydrocarbons, C18 fatty acids, and C18 fatty and alkyl and triglyceride esters. These tetrasulfides are useful as extreme pressure lubricant additives and show potential as replacements for sulfurized sperm whale oil.
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Citations
8 Claims
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1. Tetrasulfide compounds having the structural formula:
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space="preserve" listing-type="equation">R.sup.1 --S--S--S--S--R.sup.2wherein R1 and R2 are each independently selected from the following substituent groups;
##STR4## wherein R1 and R2 are not both --(CH2)17 CH3 ;
wherein r and s are each in the range of 4-10 with the proviso that r+s=15;wherein w and y are each in the range of 1-8, x is 2 or 3, and z is in the range of 0-8, with the proviso that w+x+y+z=13; and wherein R3 is hydrogen;
C1 -C5 straight or branched alkyl;
or ##STR5## wherein R4 and R5 are each independently selected from the acyl radicals or C16 -C18 saturated and unsaturated fatty acids, and from the acyl radicals of the mercapto, thiolan, and thiane derivatives of C18 unsaturated fatty acids. - View Dependent Claims (2, 3, 4, 6, 7, 8)
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5. A lubricating composition comprising a base lubricating oil and an effective amount of an extreme pressure additive, said additive comprising a tetrasulfide compound having the structural formula:
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space="preserve" listing-type="equation">R.sup.1 --S--S--S--S--R.sup.2wherein R1 and R2 are each independently selected from the following substituent groups;
##STR6## wherein R1 and R2 are not both --(CH2)17 CH3 ;
wherein r and s are each in the range of 4-10 with the proviso that r+s=15;wherein w and y are each in the range of 1-8, x is 2 or 3, and z is in the range of 0-8, with the proviso that w+x+y+z=13; and wherein R3 is hydrogen;
C1 -C5 straight or branched alkyl;
or ##STR7## wherein R4 and R5 are each independently selected from the acyl radicals of C16 -C18 saturated and unsaturated fatty acids, and from the acyl radicals of the mercapto, thiolan, and thiane derivatives of C18 unsaturated fatty acids.
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Specification