Patent ID: 6017562
Filing Date: 2000-01-25
Classification: A01N,A61K,A61Q,C07D,Y10S

Abstract:
A method for producing non-spherical and/or non-platelet particles of pyrithione salt selected from the group consisting of rods, needles, cylinders, cones, ellipsoids, prisms, parallelepipeds, pyramids, tetrahedrons, hexahedrons, octahedrons, dodecahedrons, icosahedrons, and combinations thereof, comprising reacting a reaction mixture comprising pyrithione or a water-soluble salt of pyrithione and a water-soluble polyvalent metal salt being a divalent salt selected from the group consisting of zinc salts, tin salts, cadmium salts, bismuth salts, zirconium salts, magnesium salts, aluminum salts, and combinations thereof, in a carrier and in the presence of a dispersant, in an amount from about 0.1 to about 10% by weight, based on the total weight of the reaction mixture, said dispersant being selected from the group consisting of sodium salts of polymerized alkyl naphthalene sulfonic acids, and potasium salts of polymerized alkyl naphthalene sulfonic acids and combinations thereof, optionally in the presence of a surfactant, at a temperature from about 20.degree. C. to 60.degree. C. to produce non-spherical and non-platelet particles of pyrithione salt.