Iron blue pigment composition and process for its production
AssigneeHercules Incorporated
InventorsJohan Jozef Einerhand, Leonardus Johannes Hubertus Erkens, Rene Johannes Laenen, Joseph Wilhelmus Jacobus Hoofs
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Abstract
The production of iron blue pigment compositions by a flushing process has been found to be improved by carrying out the flushing step in the presence of an amine flushing agent and incorporating into the composition during or after flushing at least one surfactant of the polyoxyethylene type. The resulting iron blue compositions have improved consistency and dispersibility in printing inks, paints and the like.
Claims10
In a process for producing an iron blue pigment composition in paste form by subjecting a mixture of water-wet iron blue and an oil binder to a flushing operation in the presence of an amine flushing agent until a separate water phase is formed, separating the water phase, removing residual water and recovering the resulting pigment composition, the improvement which consists of incorporating into the iron blue pigment composition at least one surfactant of the polyoxyethylene type.
Dependencies are inferred from the claim text.