E. Tsatsaroni

Hetarylazo disperse dyes derived from substituted N,N-bis-β-hydroxy- and N,N-bis-β-acetoxy-ethylaniline

Abstract The heterocyclic amines 2-amino-6-methoxy- and 2-amino-6-nitro-benzothiazole, 3-amino-5-nitro[2,1]benzisothiazole and 2-amino-3,5-dinitro-thiophene were diazotised and coupled to substituted N , N -di-β-hydroxyethylaniline and N , N -di-β-acetoxyethylaniline to give dyes which coloured cellulose acetate in red to greenish-blue hues. The colour of the dyes is discussed with respect to the nature of the heterocyclic ring and to the substituents in the diazo and coupling component and compared to the corresponding dye using aniline as diazo component. Dyeing and fastness properties of the dyes are also reported.

Synthesis, characterisation and application of disperse dyes derived from N-2-hydroxyethyl-1-naphthylamine

The synthesis and characterisation of a series of disperse dyes obtained by diazotisation of heterocyclic arylamines and coupling of these compounds with N-2-hydroxyethyl-1-naphthylamine are reported. The dyes were applied to cellulose acetate and their dyeing and fastness properties were assessed and summarised. The absorption spectra of the dyes are discussed, with regard to structure and substitution of the heterocyclic diazo component.

Effectiveness of various UV-absorbers on the dyeing of polyester with disperse dyes. Part IV.

The effect of benzotriazole type UV-absorbers Tinuvin P and Tinuvin 327 and 2,4-dihydroxy benzophenone in the dyeing of polyester fabrics with C.I. Disperse Yellow 86 and C.I. Disperse Red 86 at various depths of dyeing was studied. Various amounts and two application processes of the UV-absorber were used. The dye and UV-absorber uptake, and the light and sublimation fastness of the fabrics dyed and those treated with the UV-absorber were determined and the results compared with those obtained with the corresponding samples dyed in absence of a UV-absorber.

Dyeing of polyester fabrics with disperse dyes in the presence of a UV-absorber

Abstract The adsorption kinetics of the UV-absorber Tinuvin P, 2-(2-hydroxy-5 methyl-phenyl)-2H-benzotriazole on polyester (PET) fabrics have been studied. Polyester fabrics were dyed with CI Disperse Blue 85 and a new red monoazo disperse dye in different depths (0–5,1 and 2% o.w.f.) by application of the UV-absorber by different processes (pretreatment, simultaneous addition and af ter treatment ) and various UV-absorber/dye molar ratios (0.5–3.5). The application of the UV-absorber (0.1–2.5% o.w.f.) resulted in a slight decrease in dye uptake by the pretreatment and simultaneous addition processes, and in most cases in an improvement of light fastness (0–2 units of the Blue Standard scale) of the dyed fabrics. The light fastness improvement was generally higher for the aftertreatment process and for the blue dye.

Hetarylazo disperse dyes derived from 5,6-dichloro- and 6,7-dichloro-2 aminobenzothiazoles

Abstract The isomer mixtures resulting from the diazotisation of 5,6-(6,7-)dichloro-2-aminobenzothiazole and coupling to N-substituted anilines were separable by column chromatography. Isomer characterisation was effected by unambiguous dye synthesis from the individual dichloro-2-aminobenzothiazoles, and by 1H NMR. The colour and dyeing parameters of isomers were found to be essentially equivalent, and similar to those of the corresponding isomer mixtures.

Dyeing of polyester with CI disperse yellow 42 in the presence of various UV-absorbers. Part II

Abstract The effect of various amounts (0·5–1·2 owf) of two benzotriazole (Tinuvin P and Tinuvin 320) and one benzophenone (Ultrafast 800) type UV-absorbers applied directly in the dyeing of polyester fibres with CI Disperse Yellow 42 at various depths (0·5, 1·0 and 2·0% owf), or by after-treatment of the dyed fibre, was studied. Combinations of Tinuvin 320 with various amounts of an antioxidant (BHT) in the dye liquor were also used and results compared.

Identification of nylons by thin layer chromatography

The composition of nylons by ω-amino-carboxylic acid monomers, dicarboxylic acids, and diamines is identified by thin layer chromatography, using their acid hydrolysates and determining the corresponding Rf values. n n n nDie Zusammensetzung von Nylon aus ω-Aminocarbonsauremonomeren bzw. Dicarbonsauren und Diaminen wurde mittels Dunnschichtchromatographie durch Bestimmung der entsprechenden Rf-Werte der Saurehydrolysate ermittelt.