Abstract Lubricant compositions having increased lubricity are obtained by forming a mixture of a major amount of a silicone lubricant and a minor amount of a sulfur containing compound dissolved in the silicone and including at least two sulfur atoms per molecule. According to a preferred form of the invention, from 1 to 10 parts by weight of di-tertiary-nonyl polysulfide are admixed with from 99-90 parts by weight of a silicone oil to provide a new composition which functions properly as a lubricant under loads as high as 240 kilograms when employing the Shell 4Ball EP machine. Without the polysulfide additive, the silicone oil is not useful as a lubricant under loads exceeding about 40 kilograms when employing the Shell 4-Ball EP machine.
The lubricant composition of claim 1 in which the sulfur containing compound ranges from about 0.1 percent to about 25 percent by weight of the total weight of said silicone and said sulfur-containing compound.
Claim 2
Dependent Claim
71 words
The lubricant composition of claim 1 in which the sulfur-containing compound is a hydrocarbon polysulfide derivative of 2, 5-dimercapto-1,3,4,-thiadiazole having the general formula wherein R11 and R12 are the same or different hydrocarbon radicals selected from the class consisting of alkyl, cycloalkyl, aryl, alkaryl, aralkyl, haloaryl, and cyanoalkyl radicals; and a and b are whole numbers from 0 to about 8, the sum of a and b being at least 1.
Claim 3
Dependent Claim
24 words
The lubricant composition of claim 1 wherein the sulfur-containing compound comprises a compound having the general formula H-S-(C2H4-O-CH2-O-C2H4-S2)x-C2H4-0-CH2-O-C2H4-S-H wherein x is 6 or 23.
Claim 4
Dependent Claim
26 words
The lubricant composition of claim 1 wherein the sulfur-containing compound comprises a di-tertiary alkyl polysulfide wherein the alkyl group includes from four to 12 carbon atoms.
Claim 5
Dependent Claim
13 words
The lubricant composition of claim 5 wherein the sulfur-containing compound is di-tertiary-nonyl polysulfide.