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US 4,054,578 AGranted
Certain heterocyclic sulfonium compounds
AssigneeThe Dow Chemical Company
InventorsWayne W. Frenier, William J. Settineri
Life of this patent
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Abstract
Novel sulfonium compounds are described herein which correspond to the formula ##STR1## The sulfonium compounds are useful corrosion inhibitors in acidic cleaning solutions.
Claims6
A compound corresponding to the formula ##STR5## wherein n is 1 or 2;
- each R.sub.1 independently is hydrogen or a hydrocarbyl, hydrocarbyloxy or hydrocarbylthio group of from 1 to 24 carbon toms, or a hydrocarbyl group of from 1 to 24 carbon atoms whose chain length is interrupted by an atom of oxygen or sulfur;
- R.sub.2 and R.sub.3 are joined to form, in combination with the sulfonium atom, a 5- or 6-membered heterocyclic ring selected from the group consisting of thiophenium, tetrahydrothiophenium, thiopyrylium and tetrahydrothiopyrylium, with the proviso that the total aggregate carbon content of R.sub.1, R.sub.2 and R.sub.3 is from 10 to about 25 carbon atoms;
- and A.sup.- is a neutralizing anion.
Dependencies are inferred from the claim text.