The present invention provides a method of purifying an aqueous dye solution having an aldehyde and/or ketone impurity including a step of reacting the impurity with a hydrazine derivative, forming a water-insoluble hydrazone compound. The hydrazone compound is then removed from the solution to form a dye having an increased purity.
申请公布号
WO0100737(A1)
申请公布日期
2001.01.04
申请号
WO2000US16930
申请日期
2000.06.19
申请人
BASF CORPORATION;CUSACK, KEVIN;KIM, KWANG;EDIE, DENNIS;TENNYSON, BENJAMIN
发明人
CUSACK, KEVIN;KIM, KWANG;EDIE, DENNIS;TENNYSON, BENJAMIN