申请人:Hoechst Aktiengesellschaft
公开号:US04617403A1
公开(公告)日:1986-10-14
Process for preparing a strong, non-flocking and rheologically excellent 4,4',7,7'-tetrachlorothioindigo pigment in high yields and high purity, which comprises (a) reacting 2,5 -dichlorophenylthioglycoloyl chloride with Friedel-Crafts catalysts in inorganic acyl halides of medium oxidation state as diluent as temperatures of -20.degree. to +50.degree. C. to 4,7-dichloro-3-oxythionaphthene, (b) oxidizing the resulting 4,7-dichloro-3-oxythionaphthene in a conventional manner to crude 4,4',7,7'-tetrachlorothioindigo, and (c) treating the crude 4,4',7,7'-tetrachlorothioindigo obtained in moist form with an aromatic solvent at 80.degree. to 180.degree. C. in the presence of an aqueous alkali solution and a surface-active compound.
制备高产量和高纯度的强、不褪色和流变优异的4,4',7,7'-四氯硫代靛颜料的过程,包括(a)在无机酰卤介质中,以中等氧化状态为稀释剂,在-20°C到+50°C的温度下,使用弗里德尔-克拉夫催化剂将2,5-二氯苯硫醇酰氯与反应生成4,7-二氯-3-氧代硫萘,(b)以传统方式氧化所得的4,7-二氯-3-氧代硫萘为原料,制得粗4,4',7,7'-四氯硫代靛,(c)在芳香溶剂、水溶性碱液和表面活性剂的存在下,以80°C至180°C的温度处理得到的湿态粗4,4',7,7'-四氯硫代靛。