Arch Chemicals, Inc.

Olin Corporation

Paul S. Kappock

Patrick Flaherty

Paul S Kappock

Craig Waldron

Kazunobu Takahashi

Robert J Martin

A composition containing unique particles of copper pyrithione wherein greater than 20 wt % to 90 wt % of the particles have a particle size of greater than 10 microns, as determined by laser light scattering using a particle size distribution analyzer, and wherein the particles are flat acicular needle-shaped is described herein. Also described herein is an antifouling paint containing the copper pyrithione and a method of making the composition and antifouling paint.

Synthesis of copper pyrithione from zinc pyrithione and copper compound

Disclosed is a composition containing zinc ester functional polymer and particulate copper pyrithione, wherein the particles have an average aspect ratio within a range of from about 8 to about 15, where the zinc ester functional polymer and the copper pyrithione are obtained by reacting an acid functional polymer with zinc pyrithione and a copper salt or a copper carboxylate. Also disclosed is an antifouling coating containing such a composition.

Synthesis of zinc acrylate copolymer from acid functional copolymer, zinc pyrithione, and copper compound

Disclosed is a process for inhibiting the formation of discoloration in an aqueous composition selected from the group consisting of water-based paint, adhesive, caulk and sealant compositions, and combinations thereof, wherein said discoloration is caused by the presence of ferric ion or cupric ion together with pyrithione in said composition. The process comprises contacting the composition with a discoloration-inhibiting amount of a zinc compound selected from the group consisting of zinc salts of organic acids, zinc salts of inorganic acids, zinc hydroxide, zinc oxide, and combinations thereof. Also disclosed is an aqueous antimicrobial composition protected against discoloration attributable to the presence of ferric ion or cupric ion therein.

Discoloration prevention in pyrithione-containing coating compositions

Disclosed is an aqueous coating composition comprising: (a) water, (b) a base medium, (c) a pyrithione salt, in an amount of from 0.01% to 2.0% based upon the weight of the composition, and (d) zinc oxide compound selected from the many grades suitable for paint manufacture at a concentration of from 0.001% to 10% based upon the weight of the coating composition. Also disclosed is an aqueous antimicrobial coating composition, characterized by antimildew efficacy and protected against discoloration attributable to the presence of pyrithione therein, said composition being selected from the group consisting of water-based paints, adhesives, caulks and sealants, and combinations thereof, said composition comprising water, a pyrithione salt or acid, an organic base medium and a zinc compound, said zinc ion being present in said composition in an amount of from 0.001% to 10% based upon the weight of the coating composition.

Disclosed are pyrithione-containing coating compositions exhibiting a combination of in-can preservation against microbial attack plus antimicrobial efficacy of the dry film resulting from the use of the coating composition on a substrate. Also disclosed is a process for imparting in-can and dry film antimicrobial efficacy to an aqueous coating composition.

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E. Hampton, CT, United States of America

Paul S Kappock