Discoloration prevention in pyrithione-containing coating compositions
AssigneeOlin Corporation
InventorsPaul S. Kappock, Craig Waldron
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Abstract
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.
Claims5
A process for inhibiting the formation of discoloration, or removing an undesirable discoloration, in an aqueous antimicrobial composition selected from the group consisting of paints, adhesives, caulks, sealants, and combinations thereof, said composition containing a resin selected from the group consisting of vinyl, alkyd, epoxy, acrylic, polyurethane, polyester, and combinations thereof, said composition further containing a dissolved metal ion selected from the group consisting of ferric ion, cupric ion, and combinations thereof, and containing pyrithione, said process comprising incorporating into the composition a zinc ion in a molar amount at least equal to the amount of said dissolved metal ion in said composition.
Dependencies are inferred from the claim text.