Substituted sulfolanes as seal swelling agents
AssigneeThe Lubrizol Corporation
InventorFrederick William Koch
Life of this patent
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Abstract
Substituted sulfolanes in which one of the substituents is a 3-alkoxy or 3-alkythio group, or the like, are useful for swelling seals in machinery (e.g., automatic transmissions) when dissolved in a functional fluid.
Claims10
A method of causing swelling of seals in machinery which comprises contacting said seals with a composition comprising a major amount of an oleaginous liquid of lubricating viscosity and, dissolved or stably dispersed therein, a minor amount, effective to swell said seals, of a substituted sulfolane of the formula ##STR3## wherein R.sup.1 is a hydrocarbon radical having at least about 4 carbon atoms, each of R.sup.2 and R.sup.3 is hydrogen or a lower alkyl radical, and X is oxygen or sulfur.
A method of causing swelling of seals in automatic transmissions of motor vehicles which comprises contacting said seals with a composition comprising a major amount of a lubricating oil and a minor amount, effective to swell said seals, of 3-isodecoxysulfolane.
Dependencies are inferred from the claim text.