Paper dye

Organic compounds -- part of the class 532-570 series – Organic compounds – Azo

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8919, 162162, C09B 35023, C09B 35215, D21H 2128

Patent

active

058832335

ABSTRACT:
This invention relates to a dye having the formula (I) ##STR1## wherein each M is a hydrogen ion, an alkali metal ion, or R.sup.a R.sup.b R.sup.c R.sup.d N.sup.+ (where R.sup.a, R.sup.b, R.sup.c and R.sup.d are independently hydrogen, C.sub.1 -C.sub.6 alkyl, or C.sub.1 -C.sub.6 hydroxyalkyl). This invention further relates to the use of the dye.

REFERENCES:
patent: 3672816 (1972-06-01), Dehnert et al.
patent: 4266939 (1981-05-01), Hildreth et al.
patent: 5495003 (1996-02-01), Pedrazzi et al.
Walker et al., Chemical Abstracts, 96:182738 (1982).
H. Zollinger, Color Chemistry (VCH Verlagsgessellschaft, 1991) pp. 164 and 257.

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