Zinc dust, its preparation, and apparatus for preparing same
AssigneeASARCO Incorporated
InventorMelvin Stern
Life of this patent
Estimating the term…
Abstract
Zinc dust composed of generally spherical zinc dust grains and having a grain size distribution such that at least about 98% of the grains have a grain size less than 15 microns and no more than about 3% of the grains have a grain size less than 2 microns, and especially well adapted for use in corrosion-inhibiting coating compositions where thin but effective protective coatings are desired or required. The zinc dust has a metallic zinc content of about 96%-98%. The corrosion-inhibiting coating compositions, and apparatus and method for the preparation of such zinc dust are also disclosed.
Claims7
In a protective coating composition comprising zinc dust and an organic binder, the improvement which comprises utilizing as the zinc dust in said composition, by weight, about 50 to about 95% of a zinc dust comprising generally spherical zinc dust grains and having a grain size distribution as determined by a Coulter Counter such that at least about 98% of the grains have a grain size less than 15 microns, about 85 to about 93% of the grains have a grain size less than 10 microns, about 45 to about 55% of the grains have a grain size less than 5 microns, and no more than about 3% of the grains have a grain size less than 2 microns, said dust having a metallic zinc content of about 95-98%.
Dependencies are inferred from the claim text.