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Di(methylsulphonyl)quinacridone : synthesis, characterisation and application in nylon / Pamela M. Visintin in COLORATION TECHNOLOGY, Vol. 126, N° 1 (2010)
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Titre : Di(methylsulphonyl)quinacridone : synthesis, characterisation and application in nylon Type de document : texte imprimé Auteurs : Pamela M. Visintin, Auteur ; Robert W. Mims, Auteur Année de publication : 2010 Article en page(s) : p. 11-17 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The first quinacridone derivative with methylsulphonyl substituents, 2,9-di(methylsulphonyl)quinacridone, has been synthesised using two new sulphur-containing intermediates, 2,5-di(4-methylthioanilino)-terephthalic acid and 2,5-di-(4-methylsulphonylanilino)terephthalic acid. The key step in synthesising 2,9-di(methylsulphonyl)quinacridone involves the controlled and complete oxidation of the sulphide groups to their respective sulphonyl groups. The oxidation process is unique in that the presence of a catalyst is not required. The two different polymorphs of 2,9-di(methylsulphonyl)quinacridone range in colour from red to orange and exhibit extremely low solubility in organic solvents, water and acidic or basic media. When incorporated into nylon 6 by the extrusion/injection moulding method, both crystal forms of this pigment display excellent thermal and chemical stability up to a moulding temperature of 302°C. The nylon–quinacridone compositions exhibit a high degree of light fastness, with a CIELAB Delta E*ab (colour difference) value > 1.0 after a 200-h exposure time at 6500 W. DOI : 10.1111/j.1478-4408.2010.00221.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00221.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8412
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