980-26-7Relevant articles and documents
Preparation method of 2,9-dimethyl quinacridone purplish red pigment
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Paragraph 0023-0038, (2020/05/01)
The invention discloses a preparation method of a 2,9-dimethyl quinacridone purplish red pigment. The 2,9-dimethyl quinacridone purplish red pigment is prepared by adopting a ring-closure reaction atfirst and an oxidation process next. The method comprises the following steps: adding 2,9-dimethyl-6,13-dihydroquinacridone obtained after a condensation reaction and the ring-closure reaction into areaction container; then adding a catalyst into the reaction container, adjusting a pH value to 7-11 by using a dilute alkali solution, and carrying out heating to 90 DEG C; slowly adding a hydrogen peroxide solution into the reaction container, controlling the adding molar ratio of hydrogen peroxide to the catalyst to 2, 9-dimethyl-6,13-dihydroquinacridone, continuing to heat to 105-140 DEG C, keeping the temperature, conducting a reaction for 3-4.5 hours and terminating the reaction; cooling a reaction solution to 80 DEG C, pouring the reaction solution into a beaker, adding cold water withthe same volume as the reaction solution, carrying out stirring, conducting cooling to room temperature, performing filtering, washing a filter cake with methanol, carrying out pulping for 1 hour, then conducing filtering, and carrying out top washing to obtain a crude PR122 product; and purifying the crude PR122 product. According to the method, hydrogen peroxide is adopted to replace a traditional oxidizing agent, and an oxidation process is optimized, so the purpose of improving product yield is achieved.
QUINACRIDONE SOLID SOLUTION PIGMENT, PIGMENT COLORANT, INKJET INK, AND METHOD OF PRODUCING SOLID SOLUTION PIGMENT
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Paragraph 0042-0044, (2020/01/23)
PROBLEM TO BE SOLVED: To provide: a quinacridone solid solution pigment which has a new color tone, an excellent pigment characteristic and a novel skeleton; and a pigment colorant and an inkjet ink that employ the same. SOLUTION: A quinacridone solid solution pigment is a solid solution of a compound represented by the specified general formula (1) and a quinacridone represented by the specified general formula (2). Also provided are a method of producing the same, and a colorant and an inkjet ink that contain the solid solution pigment. SELECTED DRAWING: None COPYRIGHT: (C)2020,JPOandINPIT
METHOD FOR MANUFACTURING DISPERSION OF QUINOLINE DERIVATIVE
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Page/Page column 6, (2009/02/11)
A method for manufacturing a dispersion of a quinoline derivative that is dispersed at a high concentration and has a small particle size. The method includes the steps of preparing a solution by dissolving an N-arylanthranilic acid derivative in an organosulfonic acid, heating the solution and obtaining a reaction liquid in which a quinoline derivative has been produced by a condensation ring-closing reaction, and obtaining a dispersion of the quinoline derivative by mixing the reaction liquid with an aqueous solution. The step of mixing the reaction liquid with an aqueous solution may be performed in a mixing field having a micro-channel.