| 摘要 |
The invention relates to a process for coloring polyamides in the melt with azo pigments of the formula <IMAGE> wherein A is the radical of a diazo or tetraazo component, R1, R2 and R3 are hydrogen atoms or alkyl, cyclo alkyl, phenylalkyl or aryl radicals, and n is 1 or 2. Articles colored with the pigments have level, strong yellow shades of excellent fastness to light, wet processing, rubbing and thermofixation.
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