| Autor: |
Visintin, Pamela M, Mims, Robert W |
| Předmět: |
|
| Zdroj: |
Coloration Technology; 2010, Vol. 126 Issue 1, p11-17, 7p, 2 Diagrams, 3 Charts, 3 Graphs |
| Abstrakt: |
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 Δ E*ab (colour difference) value >1.0 after a 200-h exposure time at 6500 W. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text