Yellow anionic disazo dyes

Bleaching and dyeing; fluid treatment and chemical modification – Dye or potential dye composition – additive – treatment,... – Azo – acridone – or quinone dye

Reexamination Certificate

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Details

C008S669000, C008S670000, C008S671000, C008S681000, C008S687000, C008S689000, C534S573000, C534S740000, C534S744000, C534S756000, C534S767000, C534S784000, C534S819000

Reexamination Certificate

active

07341607

ABSTRACT:
The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper.

REFERENCES:
patent: 2228321 (1941-01-01), Messmer
patent: 2544087 (1951-03-01), Hindermann
patent: 3078266 (1963-02-01), Hanhart
patent: 4213897 (1980-07-01), Moser et al.
patent: 5545724 (1996-08-01), Moser
patent: 5545725 (1996-08-01), Käser et al.
patent: 818669 (1951-10-01), None
patent: 845084 (1952-07-01), None
patent: 28569 (1915-02-01), None
patent: 902228 (1962-08-01), None
patent: 51011817 (1976-01-01), None
W. Czajkowski, Dyes and Pigments, vol. 17, (1991), pp. 297-301.

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