980-26-7Relevant articles and documents
Production method of quinacridone pigment or mixed crystal pigment thereof
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Paragraph 0017-0018; 0019-0020; 0025-0026; 0027-0034, (2020/09/16)
The invention belongs to the field of pigments, and relates to a production method of a quinacridone pigment or a mixed crystal pigment thereof, namely an environment-friendly and economical production method of the quinacridone pigment. The method comprises the following steps: cyclizing diphenylamino terephthalic acid or a derivative thereof in a formula (2); hydrolyzing the reaction mixture obtained by cyclization with water at 0-100 DEG C; separating out a crude pigment obtained in this way, then pulping the crude pigment in an aqueous medium without any additive, completing crystal form transformation of the pigment and curing of pigment particles at 120-170 DEG C in a closed reaction kettle, then directly separating or adding a surface modifier for surface modification, and then separating to obtain the pigment. Crystal form transformation and pigment particle curing are completely completed in an aqueous medium, and the method is environmentally friendly and low in cost.
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
Preparation method for quinacridone and derivatives of quinacridone
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, (2017/08/29)
The invention relates to the field of synthesis of organic pigments and discloses a preparation method for quinacridone and derivatives of the quinacridone. The preparation method comprises the steps that dimethyl succinate generates sodium dimethyl succinylsuccinate (DMSS) through cyclic condensation under an effect of sodium methoxide, and then being acidized into DMSS; condensation reaction occurs between the DMSS and aniline or substituted aniline, an intermediate product generated during condensation is directly oxidized and dehydrogenated by sodium 3-nitrobenzene sulfonate to obtain an oxidative product; and finally coarse products of the quinacridone or the derivatives of the quinacridone are prepared from the oxidative product in a ring-closing mode under an effect of polyphosphoric acid, and finally finished products of the quinacridone or the derivatives of the quinacridone are obtained through pigmentation treatment.
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.
Quinacridone nanoscale pigment particles
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Page/Page column 21, (2008/12/07)
A nanoscale pigment particle composition includes a quinacridone pigment including at least one functional moiety, and a sterically bulky stabilizer compound including at least one functional group, wherein the functional moiety associates non-covalently with the functional group; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, to afford nanoscale-sized particles.
Quinacridone pigment compositions comprising unsymmetrically substituted components
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Page 15, (2010/02/10)
The present invention relates to a novel quinacridone pigment compositions, a process using a mixed amine synthesis for the ultimate production of the compositions and to their use as colorants for pigmenting high molecular weight organic materials.
PROCESS FOR THE PREPARATION OF ORGANIC PIGMENTS
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Page/Page column 16, (2010/02/14)
The present invention relates to advantageous processes for the manufacture of organic pigments and their precursors. The invention particularly relates to reactions carried out in an "All In One Reactor" (Draiswerke GmbH, Germany), a kneader like the TurbuKneader of the same company, a paddle dryer like the Turbudry of the same company or a related system and thereby submitting the reaction mixtures to enhanced driving power as expressed by a Froude number>1, the reaction mixture being caused to react in high concentrations at elevated temperature.
Organic pigment fine-particle, and method of producing the same
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Page/Page column 29, (2008/06/13)
A method of producing a fine particle of an organic pigment, containing the steps of: flowing a solution of an organic pigment dissolved in an alkaline or acidic aqueous medium, through a channel which provides a laminar flow; and changing a pH of the solution in the course of the laminar flow.
