Pyrithione biocides enhanced by zinc metal ions and organic amines
AssigneeArch Chemicals, Inc.
InventorsMichelle L. Rioux, Diana T. Ciccognani, Thomas J. Palys, Patricia A. Turley
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Abstract
The present invention is directed to a stable, soluble, antimicrobial composition concentrate comprising pyrithione or a pyrithione complex in an amount of from about 0.5% to about 30 weight percent, a zinc source in an amount of from about 0.1% to about 10%, and an organic amine component in an amount of from about 30% to about 80%, said percents being based upon the total weight of the composition concentrate. The invention is also directed to methods of controlling the growth of free-living microorganisms or biofilms using the antimicrobial composition of the invention, and products made using the antimicrobial composition of the invention.
Claims7
A method for inhibiting the growth of free-living microorganisms or biofilm in a metalworking fluid, comprising the steps of:
- (A) providing an antimicrobial composition concentrate comprising:
- (a) from about 1% to about 10% of sodium pyrithione;
- (b) from about 0.05 to about 3% of a zinc source selected from the group consisting of zinc salts, zinc borates, zinc oxides, zinc hydroxides, zinc sulfates, zinc chlorides, zinc alloys, zinc complexes, and combinations thereof;
- (c) from about 40% to 70% of alkanolamines selected from the group consisting of ethanolamine, 1-amino-2-propanol, 3-amino-l-propanol, and combinations thereof;
- (B) incorporating said antimicrobial composition concentrate into a metalworking fluid to to provide a “masterbatch” comprising, fluid,
- (a) from about 0.05 to about 5% sodium pyrithione;
- (b) from about 0.005 to about 1% of said zinc source;
- (c) from about 0.5 to about 40% of said alkanol amines;
- (C) diluting said “masterbatch” to produce an antimicrobially effectively metal working fluid,
- (D) contacting said free-living microorganisms or biofilm with said antimicrobially effective metalworking fluid,
- wherein said antimicrobially effective metalworking fluid has an enhanced biocidal effect against free-living microorganisms or biofilms.
A method of using an antimicrobial composition which comprises incorporating said antimicrobial composition into a metalworking fluid in order to impart antimicrobial efficacy to said metalworking fluid, wherein said antimicrobial composition comprises:
- from about 0.05 to about 5% sodium pyrithione;
- from about 0.005 to about 1% of a zinc source selected from the group consisting of zinc salts, zinc borates, zinc oxides, zinc hydroxides, zinc sulfates, zinc chlorides, zinc alloys, zinc complexes, and combinations thereof;
- and from about 0.5 to about 40% of an organic amine component selected from a group consisting of selected from the group consisting of ethanolamine, 1-amino-2-propanol, 3-amino-l-propanol, and combinations thereof.
Dependencies are inferred from the claim text.