Stabilization of solutions of 3-isothiazolones
AssigneeRohm and Haas Company
InventorsGeorge A. Miller, Ernest D. Weiler
Life of this patent
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Abstract
Solutions of 3-isothiazolones are stabilized against chemical decomposition of the isothiazolone by adding thereto a metal nitrate or a metal nitrite.
Claims16
A method of stabilizing a solution containing a 3-isothiazolone complex of the formula ##STR3## wherein Y is a hydrogen atom, an alkyl group of 1 to 18 carbon atoms, an alkenyl or alkynyl group of 2 to 18 carbon atoms, a cycloalkyl group of 3 to 12 carbon atoms, having a 3 to 8 carbon atom ring, an aralkyl group of up to 10 carbon atoms, or an aryl group of up to 10 carbon atoms;
- R is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4)alkyl group;
- R' is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4)alkyl group;
- M is a cation of barium, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, mercury, nickel, silver, strontium, tin or zinc;
- X is a chloride, bromide iodide, sulfate, nitrate, nitrite, acetate, chlorate, perchlorate, bisulfate, bicarbonate, oxalate, maleate, p-toluenesulfonate, carbonate, or phosphate anion;
- a is the integer 1 or 2;
- and
- n is an integer which for the anion X satisfies the valence of the cation M;
- against decomposition of the complex, which comprises adding to the solution a stabilizing amount of a metal salt selected from the group consisting of nitrates and nitrites of sodium, potassium, calcium, magnesium, copper, iron, nickel, zinc, barium, manganese, silver, and cobalt, and mixtures thereof.
A stabilized solution which comprises a solvent, a 3-isothiazolone complex of the formula ##STR4## wherein p1 Y is a hydrogen atom, an alkyl group of 1 to 18 carbon atoms, an alkenyl or alkynyl group of 2 to 18 carbon atoms, a cycloalkyl group of 3 to 12 carbon atoms, having a 3 to 8 carbon atoms ring, an aralkyl group of up to 10 carbon atoms, or an aryl group of up to 10 carbon atoms;
- R is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4) alkyl group;
- R' is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4)alkyl group;
- M is a cation of barium, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, mercury, nickel, silver, strontium, tin or zinc;
- X is a chloride, bromide, iodide, sulfate, nitrate, nitrite, acetate, chlorate, perchlorate, bisulfate, bicarbonate, oxalate, maleate, p-toluenesulfonate, carbonate, or phosphate anion;
- a is the integer 1 or 2;
- and
- n is an integer which for the anion X satisfies the valence of the cation M;
- and a metal salt selected from the group consisting of nitrates and nitrites of sodium, potassium, calcium, magnesium, copper, iron, nickel, zinc, barium, manganese, silver, and cobalt, and mixtures thereof.
Dependencies are inferred from the claim text.