| 摘要 |
PURPOSE:To provide a water-soluble disazo compd. which gives a polarizing film having excellent dichroism and fastness and makes it possible to greatly increase the range of its use which has been limited hitherto, consisting of a free acid having a specified structural formula, and to provide a copper complex salt thereof. CONSTITUTION:The titled water-soluble disazo compd. is obtd. from a free acid of formula I (wherein X is H, methyl, methoxy, ethoxy; Y is methoxy, ethoxy; R1 is H, methyl, -C2H4OH, benzene, phthalic acid, benzenesulfonic acid). The compd. of formula II is diazotized and coupled with a coumpd. of formula III. The resulting monoazo compd. of formula IV is diazotized and coupled with a compd. of formula V to obtain the water-soluble disazo compd. of formula I . If desired, the compd. is treated with copper sulfate to obtain a copper complex salt.
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