The use of aromatic compounds as phase directors and particle size reducers for quinacridone pigments

本发明涉及一种生产α、γ-I、γ-II和γ-III晶型的喹吖啶酮和包含各种喹吖啶酮的固溶体的透明喹吖啶酮颜料的方法，其使用多种三芳基仲三嗪，特别是间苯二酚三嗪衍生物；或具有至少一个连接到环上的羟基或酮基的芳族或杂芳族化合物作为添加剂，其在相应的二氢喹吖啶酮盐的氧化之前加入或者同时加入。 The present invention relates to a process for producing alpha, gamma-I, gamma-II and gamma-III crystal modifications of quinacridone and transparent quinacridone pigments including the solid solutions of various quinacridones, using a variety of tris-aryl-s-triazines, particularly resorcinol triazine derivatives, or aromatic- or heteraromatic-compounds having at least one hydroxyl or keto group bonded to the ring, as an additive, prior to or concurrently with the oxidation of corresponding dihydroquinacridone salts.