NOPR Collection:

Fastness properties of Cr(lll), Co(ll) and Cu(II) complexes containing monoazopyrazolone nucleus on wool and polyester/wool blend

2016-07-20T06:20:15Z

Title: Fastness properties of Cr(lll), Co(ll) and Cu(II) complexes containing monoazopyrazolone nucleus on wool and polyester/wool blend Authors: El-Hefnawy, G B; El-Borai, M A; Aly, El-Saied A; Gabr, A A Abstract: Five azo dyes containing the pyrazolone moiety as a chelating system were prepared and applied to wool and polyester/wool blend as disperse dyes. Metallization of these dyes on the dyed fabric was carried out using chromium acetate, cobalt acetate and copper acetate solution to form the metal complex inside the fibres. The metalized dyes showed better light and wash fastness than the original dyes and moderate to good perspiration and rubbing fastness. Page(s): 160-163

Flexural rigidity and elastic recovery of polyester-viscose ring- and rotor-spun yarns in relation to some processing factors

2016-07-20T06:19:26Z

Title: Flexural rigidity and elastic recovery of polyester-viscose ring- and rotor-spun yarns in relation to some processing factors Authors: Tyagi, G K; Chatterjee, K N Abstract: The influence of fibre linear density and twist factor on the flexural rigidity and elastic recovery of polyester-viscose ring- and rotor-spun yarns has been studied at different rotor speeds. It has been observed that the polyester-viscose rotor yarns possess slightly higher flexural rigidity and elastic recovery than the corresponding ring-spun yarns. For rotor yarns, flexural rigidity increases with increase in polyester fibre linear density and twist factor, and elastic recovery hardly changes with twist factor and rotor speed but decreases with increase in polyester fibre linear density. Page(s): 158-159

Synthesis of 5-(4-arylazo/hetarylazo-phenyl)-2-hetaryl-3,4-dihydroxythiophene derivatives and their application on polyester fibres as disperse dyes

2016-07-20T06:18:24Z

Title: Synthesis of 5-(4-arylazo/hetarylazo-phenyl)-2-hetaryl-3,4-dihydroxythiophene derivatives and their application on polyester fibres as disperse dyes Authors: Rangnekar, D W; Mavlankar, S V Abstract: 2-(Benzoxazol-2-yl)-3,4-dihydroxy-5-(4-nitrophenyl)thiophene (Va) and 2-(benzimidazol-2-yl)- 3,4-dihydroxy-5-(4-nitrophenyl)thiophene (Vb) were synthesized from S-(4-nitrobenzyl)thioacetic acid (II) by condensation with diethyl oxalate followed by subsequent treatment with 2-aminophenol (IVa) and 1,2-diaminobenzene (IVb) respectively. The compounds Va and Vb were reduced with zinc-acetic acid to corresponding amino derivatives VIa and VIb and the diazo components derived from VIa and VIb were coupled with a variety of coupling components (VIIIa-f) to result 5-(4-arylazo/hetarylazo-phenyl)-2- (benzoxazol-2-yl/benzimidazol-2-yl)-3,4-dihydroxythiophenes (IXa-f and Xa-f). The compounds IXa-f and Xa-f when applied on polyester fibres gave yellow to red shades with poor to good pick-up, moderate light fastness and good sublimation fastness. Page(s): 153-157

Bisazo disperse dyes derived from 6,6'-bis[3-(3-/4-aminophenyl)-2- methylquinazolin-4(3H)-one] for dyeing nylon, polyester and cellulose triacetate fibres

2016-07-20T06:17:05Z

Title: Bisazo disperse dyes derived from 6,6'-bis[3-(3-/4-aminophenyl)-2- methylquinazolin-4(3H)-one] for dyeing nylon, polyester and cellulose triacetate fibres Authors: Desai, D M; Patel, (Miss) R G; Patel, V S Abstract: Forty bisazo dyes, 6,6'-bis[3-(3-/4-arylazophenyl)-2-methylquinazolin-4(3H)-ones], have been prepared by coupling 6,6'-bis[3-(3-/4-aminophenyl)-2-methylquinazolin-4(3H)-one] with N-substituted and N N-disubstituted derivatives of anilines and their dyeing performance on nylon, polyester and cellulose triacetate fibres has been assessed. The dyes show fair to very good fastness to light and very good to excellent fastness to washing, rubbing, perspiration and sublimation. Page(s): 144-152