Heat stable monoazo magenta pigment compositions

摘要: Disclosed are blue shade red to magenta monoazo pigments which obtained by diazotization of 5-alkoxy-2-aminobenzenesulfonic acids, coupling the diazonium compound with a hydroxynaphthalenesulfonic acid and subsequent laking product divalent metal salt. The characterized formula (I); wherein R is lower alkyl, e.g. methyl or ethyl group, hydroxycarbyl R1 hydrogen, chloro, alkyl group such as ethyl, alkoxy methoxy an ethoxy M Ca, Sr, Ba, Mn, Mg Zn. new have color, excellent heat stability, bleed fastness very high color strength. These suitable for pigmenting plastics, inks coatings, among other materials.