Dioxazine pigment and colorant
AssigneeDIC Corporation
InventorsShogo Yamada, Hiromasa Kikuchi, Hidehiro Otake
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Abstract
An object of the present invention is to provide a dioxazine pigment having excellent fluidity. More specifically, an object of the present invention is to provide a dioxazine pigment in which practically sufficient fluidity is attained in both (1) initial viscosity and (2) storage stability when the dioxazine pigment is used in a printing ink application. The object is attained by providing a dioxazine pigment having a contact angle with respect to water according to an infiltration rate method in a range of 30° to 75°, and a contact angle with respect to 1-bromonaphthalene according to an infiltration rate method in a range of 30° to 75°.
Claims2
A method for producing a dioxazine pigment, the method comprising:
- adding a dioxazine into a solvent with stirring to obtaining a pigment slurry;
- and
- adding an iron salt and hydrogen peroxide into the pigment slurry with stirring to obtain the dioxazine pigment,
- wherein the dioxazine is represented by formula (I):
Dependencies are inferred from the claim text.