申请人:Bayer Corporation
公开号:US05755873A1
公开(公告)日:1998-05-26
This invention relates to a process for the preparation of quinacridone pigments by (a) heating a reaction mixture comprising (i) a 2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6-dihydroterephthalic acid, or a 2,5-dianilino-3,6-dioxo-1,4-cyclohexadiene-1,4-dicarboxylic acid; (ii) about 0.1 to about 15 percent by weight, based on component (a)(i), of one or more sulfonyl-containing derivatives of 2,5-dianilinoterephthalic acid, 2,5-dianilino-3,6-dihydroterephthalic acid, and/or 2,5-dianilino-3,6-dioxo-1,4-cyclohexadiene-1,4-dicarboxylic acid; and (iii) about 3 to about 20 parts by weight, per part of component (a)(i), of a dehydrating agent, with the proviso that if either component (a)(i) or component (a)(ii) is a 2,5-dianilino-3,6-dihydroterephthalic acid or derivative thereof, reaction step (a) additionally comprises an oxidation step; (b) drowning the reaction mixture from step (a) with a liquid in which the quinacridone pigment is substantially insoluble; and (c) isolating the quinacridone pigment.
本发明涉及一种制备喹吖啶颜料的过程,包括以下步骤:(a)加热反应混合物,其中包括(i)2,5-二氨基苯甲酸、2,5-二氨基-3,6-二氢苯并甲酸或2,5-二氨基-3,6-二氧代-1,4-环己二烯-1,4-二羧酸;(ii)基于组分(a)(i)的重量,约0.1至约15重量%的含磺酰基的2,5-二氨基苯甲酸、2,5-二氨基-3,6-二氢苯并甲酸和/或2,5-二氨基-3,6-二氧代-1,4-环己二烯-1,4-二羧酸的一个或多个衍生物;(iii)每份组分(a)(i)约3至约20份重量的脱水剂,但如果组分(a)(i)或组分(a)(ii)是2,5-二氨基-3,6-二氢苯并甲酸或其衍生物,则反应步骤(a)还包括氧化步骤;(b)将步骤(a)中的反应混合物用几乎不溶于喹吖啶颜料的液体淹没;(c)分离喹吖啶颜料。