Di(methylsulphonyl)quinacridone: synthesis, characterisation and application in nylon

Autor:	Pamela M. Visintin, Robert W Mims
Rok vydání:	2010
Předmět:	Terephthalic acid Chemistry Materials Science (miscellaneous) General Chemical Engineering Catalysis chemistry.chemical_compound Pigment Chemistry (miscellaneous) visual_art Quinacridone Polymer chemistry visual_art.visual_art_medium Injection moulding Extrusion Chemical stability Solubility
Zdroj:	Coloration Technology. 126:11-17
ISSN:	1478-4408 1472-3581
DOI:	10.1111/j.1478-4408.2010.00221.x
Popis:	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 ΔE*ab (colour difference) value >1.0 after a 200-h exposure time at 6500 W.
Databáze:	OpenAIRE
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