| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to a novel 2,9-dichloroquinacridone in plate-like form, which is meant for pigmentation of organic material. 2,9-dichloroquinacridone in plate-like form has length of 1-45 mcm, width of 0.1-20 mcm and thickness of 0.01-5 mcm. Said pigment has colour hue h for attenuation ëñ31, luminosity L* for transmission ëÑ20. When illumination angle and the viewing angle (specular angle) change from 45/110 (+25) to 45/90 (+45) the value b* falls, and the value a* increases. The method of producing said 2,9-dichloroquinacridone in plate-like form and pigment form involves (a) dispersion and partial dissolution of crude 2,9-dichloroquinacridone in a polar solvent in the presence of a base at temperature from 100C to boiling point of the solvent, and (b) precipitation of 2,9-dichloroquinacridone in plate-like form by adding water while lowering temperature. ^ EFFECT: obtaining 2,9-dichloroquinacridone in plate-like form, having colour properties given above in the CIELAB colour coordinate system, from crude 2,9-dichloroquinacridone without an aliphatic long-chain thiol. ^ 8 cl, 3 dwg, 2 ex |
