Reference

Fiber-reactive azo dyes

Fiber-reactive azo dyes. (Ciba-Geigy A.-G., Switz.). 98-44-2 is the cas registry number. This chemical is also mentioned in this article. Belg. BE 856062 27 Dec 1977, 29 pp. (French). (Belgium). CODEN: BEXXAL. CLASS: IC: C09B. PRIORITY: CH 76-8157 25 Jun 1976. DOCUMENT TYPE: Patent CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Fiber-reactive azo dyes [I; R = H, halo, NO2, NH2 (optionally substituted), acylamino, naphthotriazolyl (optionally substituted), 3-substituted 4-(arylazo)-5-pyrazolon-1-yl; R1, R2 = H, C1-4 alkyl; R3 = H, alkyl, aryl, heterocyclic residue; Z = coupler residue] are prepd. and are used to dye cellulosic fibers fast yellow shades. Thus, 2-amino-1,4-benzenedisulfonic acid [98-44-2] was treated with cyanuric fluoride [675-14-9]; after the acylation was completed the soln. was poured into 4-(4-aminophenylazo)-4'-aminostilbene-2,2'-disulfonic acid [65740-42-3], and aq.In this experiment, several chemicals are used like 98-44-2 NaOH was added to maintain the pH at 7-8 to give I [R = 4-(2,5-disulfoanilino)-6-fluoro-s-triazin-2-yl, R1 = R2 = H, R3 = 2,5-(HO3S)C6H3, Z = p-C6H4] [65740-48-9]. ..

Aqueous suspensions of azo compounds

Aqueous suspensions of azo compounds. Ruzicka, Karel; Sulakova, Eva (Czech. ).Several substances are used for example 28005-74-5 which is its cas registry number. Czech. CS 215389 B 29 Feb 1984,4 pp. (Czech). (Czechoslovakia). CODEN: CZXXA9. CLASS: IC: C09B067-46. ICA: C09B029-00. APPLICATION: CS 80-6351 29 Sep 1980. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Aq. suspensions of azo dyes are prepd. by coupling a diazotized heterocyclic or arom. amine with an aq. emulsion of a coupling component above its m.p. and in the presence of surfactants. The coupling in aq. emulsion improves the temp. control and selectivity of the reaction. Thus, 2-MeC6H4N(CH2CH2OH)2 [28005-74-5] was dispersed at 50° in H2O contg. 5% oxyethylated tall oil and coupled with an aq. soln. of 4-O2NC6H4N2Cl at 35-40° within ~5 min. Similarly prepd. were azo dyes from 2,5-(HO3S)2C6H3NH2 [98-44-2] 2,5-Me(MeO)C6H3NH2 [50868-72-9], 2,4-Cl(O2N)C6H3NH2 [121-87-9] and PhN(Et)CH2CH2CN [148-87-8], and 2,4,6-Br(O2N)2C6H2NH2 [1817-73-8] and 2,5-EtO(AcNH)C6H3N(CH2CH2OAc)2 [20249-05-2]. .