Disperse Blue 148;methyl N-ethyl-N-{4-[(5-nitro-2,1-benzisothiazol-3-yl)azo]phenyl}-β-alaninate;methyl 3-[N-ethyl-4-[(5-nitro-2,1-benzothiazol-3-yl)diazenyl]anilino]propanoate
Single-crystal structures of the best high-temperature trichromatic blue azo dye C.I. Disperse Blue 148 and its diazonium component 3-amino-5-nitro-[2,1]- benzisothiazole are described herein. C.I. Disperse Blue 148 exhibits an essentially coplanar molecular structure and a dimeric packing mode between adjacent phenyl and benzisothiazole rings. Particularly, PXRD measurement reveals the existence of a new crystalline form of C.I. Disperse Blue 148 having the highest melting point and the best thermal stability, which is obviously different from all the known alpha, beta, and gamma forms. A one-phase recrystallization method, which can guarantee the complete transformation, is used to prepare the new crystalline form instead of the conventional heating of an aqueous suspension of alpha form. Furthermore, TGA-DSC and pH titration experiments have been carried out to reveal the thermal and pH stabilities of this heterocyclic dye. To our knowledge, this is the first structural example on benzisothiazole involved azo dyes. (C) 2013 Elsevier Ltd. All rights reserved.
WO2024074814A1
申请人:——
公开号:——
公开(公告)日:——
CN115044226
申请人:——
公开号:——
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Dye composition
申请人:Yorkshire Chemicals PLC
公开号:US06365718B1
公开(公告)日:2002-04-02
The invention provides a dye composition for dyeing fibers comprising (a) an azo dye of formula (II) or a salt thereof, and (b) an azo dye of formula (III) or a salt thereof. The invention provides navy and black dye compositions, especially suitable for dyeing secondary cellulose acetate fibers, with superior fastness properties than known navy/black dyes. Preferably, the &agr;-crystal form of dye (III) is used, which has greater solubility and achieves quicker dyeing than the commonly-used &bgr; and &ggr; forms of (III) when dyeing cellulose acetate at 60-95° C. A new method of making the &agr; form is disclosed.