| 摘要 |
The present invention describes a process for the preparation of pigments, mixed crystal pigments, and pigment compounds, based on non-substituted or substituted lineal quinacrydones of general formula (I): wherein substituents R1 and R2 are the same or different and are hydrogen atoms, chlorine, bromine or fluorine, or alkyl groups of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, carbonamide, which may be substituted with alkyl groups of 1 to 6 carbon atoms; or phenoxy or aryl rings of 6 to 10 carbon atoms, wherein another aromatic, aliphatic or heterocyclic rings may be formed into rings; characterized in that the reaction mixture resulting from cyclation of dianilineterephthalic acid with polyphosphoric acid or the ester thereof, is hydrolyzed at a temperature of at least 110 degree C, with water or with a mineral acid aqueous solution; and then, the resulting pigment is either directly isolated, or the resulting pre-pigment, after organic solvents have been added, is subjected to a finishing treatment, and the pigment is isolated; or the resulting crude pigment having large crystals is subjected to a fine size reduction, being subsequently isolated; or alternately the pre-pigment obtained by fine size reduction, eventually, is subjected to a finishing treatment after solvents have been added and the pigment is isolated. Quinacrydone pigments are obtained which have color granting and outstanding rheological properties.
|
