Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink-jet applications / Rafal Gaida in COLORATION TECHNOLOGY, Vol. 139, N° 6 (12/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 6 (12/2023) . - p. 637-653 Titre : Influence of different dispersants on the quality and stability of aqueous quinacridone magenta pigment dispersion for ink-jet applications Type de document : texte imprimé Auteurs : Rafal Gaida, Auteur ; Kararzyna Dziubek, Auteur ; Katarzyna Krol, Auteur ; Monika Ostaszewska, Auteur ; Marian Wit, Auteur Année de publication : 2023 Article en page(s) : p. 637-653 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Dispersions et suspensions Dispersions et suspensions -- Stabilité Encre jet d'encre Ethoxylate d'alkyle Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Masse molaire La masse molaire est la masse d'une mole d'une substance (un corps simple, un composé chimique). Elle s'exprime en grammes par mole (g·mol−1 ou g/mol). Pigments -- Analyse Pigments organiques Polyacrylates Quinacridone Les pigments de quinacridone sont des pigments organiques de synthèses qui vont du rouge-orange au rouge-violet. Ils sont utilisés depuis les années 1960 par les teinturiers et les fabricants de pigment set couleurs à peindre (et plus récemment par certains tatoueurs, comme pigment dans des encres de tatouage, avec un risque allergique). Il s'agit de pigments très transparents, au fort pouvoir colorant mais modérément couvrants. Leur transparence permet de varier les teintes selon la densité et l'épaisseur de l'application. Terpolymère styrène anhydride maléïque Index. décimale : 667.2 Colorants et pigments Résumé : The stability of water-based pigment dispersions is a key factor in determining their utility in ink-jet applications, and the appropriate choice of dispersant plays a special role. Among the pigment formulations tested to date, literature data on magenta pigments are very limited. Thus, the goal of this work was to study the influence of the type and loading of dispersants on the quality and stability of quinacridone magenta pigment dispersions. Three different commercially available dispersants were tested: (1) a cationic styrene-maleic anhydride copolymer, (2) an anionic polyacrylate, and (3) a nonionic alkyl ethoxylate. Pigment and dispersing agents were analysed using the Fourier Transform–infrared method. The stability of pigment dispersions was determined by comparative studies of changes in the pigment particle size, viscosity, pH, filtration time, optical density and gloss during the accelerated ageing test. Moreover, Turbiscan AGS and LUMiFuge analysers were used for evaluations of the instability of the dispersions. The properties of each dispersing agent affected the performances of the different dispersants. The highest stability for the pigment formulations was provided using the nonionic dispersant (small particle size, < 60 nm; the lowest viscosity < 60 mPa·s at the optimal dispersant content; favourable results of the filtration test; the highest pigment dispersability, proven by optical density and gloss). The Turbiscan AGS and LUMiFuge results indicated that the stability of all tested quinacridone magenta pigment dispersions was excellent (Turbiscan Stability Index values below three, and no significant differences in transmission profiles, respectively). However, it was found that the measurement results were influenced by the viscosity of the formulations. Note de contenu : - EXPERIMENTAL : Materials - Equipment and measuring conditions - Methods - RESULTS AND DISCUSSION : Analysis of the magenta pigment - Analysis of the dispersing agents - Stability study of pigment dispersions - Table 1 : Dispersant type active matter content used in the prepared Magenta Pigment dispersions - Table 2 : Molar mass of studied dispersants determined by gel permeation chromatography DOI : https://doi.org/10.1111/cote.12678 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12678 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40116 [article]

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Light stability in cyan and magenta tones using standard and highly chromatic toner particles / Igor Majnaric in COLORATION TECHNOLOGY, Vol. 135, N° 5 (10/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 5 (10/2019) . - p. 361-369 Titre : Light stability in cyan and magenta tones using standard and highly chromatic toner particles Type de document : texte imprimé Auteurs : Igor Majnaric, Auteur ; Marko Moric, Auteur ; Damir Modric, Auteur Année de publication : 2019 Article en page(s) : p. 361-369 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cyan Le cyan est, par définition, la couleur primaire complémentaire du rouge, dans la synthèse soustractive des couleurs utilisée en photographie argentique en couleurs et en imprimerie. Imprimerie Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Photostabilité Pigments Index. décimale : 667.2 Colorants et pigments Résumé : An increasing requisite regarding the reproduction quality of electrophotographic printing machines demands improvement of new electrophotographic toner formulation, especially used pigments. The subject of this paper is a comparison of prints realised by depositing high chroma (HC) and standard emulsion aggregation (EA) toner on gloss fine art paper. HC toner has a different composition of the cyan and magenta tones compared with the corresponding standard EA toner tones and therefore behaves differently under real conditions. The patches used for this experiment were cyan and magenta tone prints with tone values (TVs) of 0, 20, 60 and 100%. Ultraviolet (UV) degradation was measured over time intervals of 0, 6, 12, 24, 48, 96, 144 and 240 h for all patches. Results (laboratory values) were calculated using colorimetric difference. Values were plotted as a function of time in tonal degradation graphs. A model was created using non‐linear regression‐based modelling. The experiment demonstrates that magenta patches are more susceptible to degradation in comparison with cyan patches. With the increase in tonal value, it is noticeable that the colorimetric difference is higher. Colorimetric differences calculated using HC magenta toner and standard EA cyan toner (100% TV) were higher than ∆E = 5, starting to appear after 6 h of exposure to UV radiance. After 12 h of exposure, colorimetric differences of standard magenta tones that were greater than ∆E = 5 also started to appear. Cyan patches (100% TV) printed with HC toner were more stable than the other patches, and after 240 h of exposure had not crossed the boundary of ∆E = 5. Note de contenu : - Toners for EP printing DOI : 10.1111/cote.12422 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12422 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33068 [article]

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Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints / Tomislav Hudika in COLORATION TECHNOLOGY, Vol. 136, N° 5 (10/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 5 (10/2020) . - p. 435-449 Titre : Polycaprolactone primers with zinc oxide and silicon dioxide nanoparticles for paper substrates : Influence on the properties of cyan and magenta offset prints Type de document : texte imprimé Auteurs : Tomislav Hudika, Auteur ; Tamara Tomasegovic, Auteur ; Tomislav Cigula, Auteur ; Marija Prsa, Auteur Année de publication : 2020 Article en page(s) : p. 435-449 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Brillance (optique) Colorimétrie Cyan Le cyan est, par définition, la couleur primaire complémentaire du rouge, dans la synthèse soustractive des couleurs utilisée en photographie argentique en couleurs et en imprimerie. Dioxyde de silicium Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Nanoparticules Offset (imprimerie) Oxyde de zinc Papier Papier -- Propriétés mécaniques Papier enduit Poly-e-caprolactone Primaire (revêtement) Résistance à l'abrasion Résistance à la traction Index. décimale : 667.2 Colorants et pigments Résumé : In this research study, the applicability of polycaprolactone‐silicon dioxide and polycaprolactone‐zinc oxide coatings used as primers on papers for offset printing, was analysed. Polycaprolactone nanocomposites with different concentrations of nanoparticles were prepared and coated onto three types of papers: uncoated, low‐coated and gloss. The main aim was to analyse the influence of the nanoparticle concentration in primer on the optical and colorimetric properties of cyan and magenta offset printed samples. To further evaluate the applicability of the primers, the tensile strength of primed samples and their surface properties were analysed. Results show that prepared primers are primarily applicable on uncoated and low coated papers. Both nanoparticles in specific concentrations increased gloss values for printed samples on low‐coated paper, and the addition of both types of nanoparticles increased the rub resistance of printed samples. Furthermore, for each type of nanoparticle, the optimal concentration at which the colour deviation on print was minimised could be defined. Adding nanoparticles to primers did not significantly improve mottling on cyan‐printed samples. However, by increasing the concentration of nanoparticles in the primer by up to 1%, the mottling on magenta‐printed samples decreased. Note de contenu : - EXPERIMENTAL : Materials and preparation of samples - Methods of measurement and analysis - RESULTS AND DISCUSSION : Tensile strength - Surface properties and adhesion parameters in the paper-primer-ink system - Rub resistance - Gloss - Smoothness of primed papers - Colorimetric properties of printed samples - Mottling DOI : https://doi.org/10.1111/cote.12487 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12487 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34487 [article]

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The relationship between the substitution position of hydrophobic groups on near-magenta anthraquinone dyestuffs and the dyeing performance for polypropylene fabric dyed in supercritical carbon dioxide in COLORATION TECHNOLOGY, Vol. 138, N° 5 (10/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 5 (10/2022) . - p. 538-550 Titre : The relationship between the substitution position of hydrophobic groups on near-magenta anthraquinone dyestuffs and the dyeing performance for polypropylene fabric dyed in supercritical carbon dioxide Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 538-550 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anthraquinone Colorants -- Analyse Couleur -- Analyse Dioxyde de carbone Fluides supercritiques Magenta Le magenta est un colorant rouge violacé d'aniline de synthèse inventé en 1858, appelé fuchsine ou roséine. C'est aussi la désignation normalisée du colorant primaire absorbant le vert dans la synthèse soustractive des couleurs en imprimerie et en photographie argentique. Polypropylène Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A series of 1-amino-4-hydroxy-2-phenoxyanthraquinone derivatives, substituted with various hydrophobic groups, were applied as dyestuffs in the carbon dioxide supercritical fluid dyeing (SFD) of unmodified polypropylene (PP) fabrics. The dyeability, colour strength, and colour fastness of the dyeing process were evaluated for 14 dyestuffs. The hue of the PP fabrics dyed with a series of dyestuffs was red of near-magenta, but it was slightly less bluish rather than magenta. The differences in dyeing performance regarding the type and position of the substituents were observable in terms of colour strength and colour fastness. On the basis of the evaluation of the colour strength and the colour fastness, this study showed that the type and position of the hydrophobic group attached to the substituted phenoxy ring affected dyeing performance. Comparisons of the dyeing performance of 2- and 4-substituted dyestuffs with the same groups attached suggested that replacement of the 2-position affected colour strength while 4-position affected colour fastness. Similarly, 2,4-disubstituted dyestuff was more suitable on the dyeing performance than 4-monosubstituted dyestuff in which alkyl had twice the amount of aliphatic carbon at one position, and 3,5-disubstituted dyestuff. Note de contenu : - EXPERIMENTAL : Materials - Methods - RESULTS AND DISCUSSION : The analysis of dyestuffs - The structural characteristic indices of dyestuff molecules - Colour strength and hue - Colour fastness and dyestuff structure - Optimum dyestuff selection - Table 1 : The substituent groups and their positioning for the dyestuffs used in this study - Table 2 : The proton nuclear magnetic resonance (1H NMR) chemical shift peaks of the employed dyestuffs and their high-performance liquid chromatography (HPLC) purity - Table 3 : The hydrophobicity and aliphaticity of the dyestuffs used in this study - Table 4 : The colour fastness of the dyed polypropylene (PP) fabrics DOI : https://doi.org/10.1111/cote.12610 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12610 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38127 [article]

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