申请人:Xerox Corporation.
公开号:US20040082801A1
公开(公告)日:2004-04-29
Disclosed is a process for preparing a colorant of the formula
1
wherein Y is a hydrogen atom or a bromine atom, n is an integer of 0, 1, 2, 3, or 4, R
1
is an alkylene group or an arylalkylene group, R
2
is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, and R
4
is an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, can be prepared by a process which comprises (a) preparing a first reaction mixture by admixing (1) leucoquinizarin and, optionally, quinizarin, (2) an aminobenzene substituted with an alcohol group of the formula —R
1
—OH, (3) boric acid, and (4) an optional solvent, and heating the first reaction mixture to prepare an alcohol-substituted colorant of the formula
2
followed by (b) converting the colorant thus prepared to either (i) an ester-substituted colorant by reaction with an esterification compound which is either (A) an anhydride of the formula
3
or (B) an acid of the formula R
2
COOH in the presence of an optional esterification catalyst, or (ii) a urethane-substituted colorant by reaction with an isocyanate compound of the formula
R
4
—N═C═O
and (c) brominating the colorant thus prepared, wherein either conversion to ester or urethane can be performed before bromination or bromination can be performed before conversion to ester or urethane.
本发明揭示了一种制备
化学式1所示
颜料的方法,其中Y为氢原子或
溴原子,n为0、1、2、3或4的整数,R1为烷基或芳基烷基,R2为烷基、芳基、芳基烷基或烷基芳基,R4为烷基、芳基、芳基烷基或烷基芳基。该方法包括以下步骤:(a)通过混合(1)白
酚喹啉和可选的
喹啉,(2)带有醇基的
氨基苯的化合物,其
化学式为-R1-OH,(3)
硼酸和(4)可选的溶剂来制备第一反应混合物,然后加热第一反应混合物以制备
化学式2的醇基取代的
颜料;(b)将所制备的
颜料转化为酯基取代的
颜料,方法为与酯化化合物(A)
化学式3的酐或(B)
化学式R2COOH的酸在可选的酯化催化剂的存在下反应,或与
化学式R4-N=C=O的
异氰酸酯化合物反应以制备
脲基取代的
颜料;(c)
溴化所制备的
颜料,其中酯化或
脲化可以在
溴化之前进行,也可以在
溴化之后进行。