Dioxazine pigment and colorant

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°.

1 . 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°. 
     
     
         2 . The dioxazine pigment according to  claim 1 , wherein dioxazine pigment particles have at least one hydroxy group and at least one carbonyl group on a surface. 
     
     
         3 . A colorant containing at least the dioxazine pigment according to  claim 1 . 
     
     
         4 . A printing ink containing at least the dioxazine pigment according to  claim 1 .