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US 9,540,520 B2Granted
Synthesis of copper pyrithione from zinc pyrithione and copper compound
AssigneeArch Chemicals, Inc.
InventorsPaul S. Kappock, Robert J. Martin
Life of this patent
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Abstract
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.
Claims7
A process of preparing a composition containing particles of copper pyrithione comprising:
- reacting zinc pyrithione with a copper salt in the presence of a non-reactive polymer or non-polymer binder,
- wherein from greater than 20 wt % to 90 wt % of the copper pyrithione particles have a particle size of greater than 10 microns as determined by laser light scattering using a particle size distribution analyzer.
Dependencies are inferred from the claim text.