Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Reexamination Certificate
2008-04-01
2008-04-01
Powers, Fiona T (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
C534S803000, C008S518000, C008S527000, C008S673000, C008S682000, C008S919000
Reexamination Certificate
active
10520964
ABSTRACT:
Anionic monoazo dyes of the formula (1) in which A represents 1- or 2-naphthyl residue, which is substituted by a total of one or two sulphonic and/or carboxylic acid groups. R1represents hydrogen or C1-C4alkyl, each D1and D2, independently of the other, represent either an amino acid residue resulting from removal of a hydrogen atom from the amino group of the amino acid or the residue —NR2R3, in which each R2and R3, independently of the other, represent hydrogen, C1-C4alkyl, C2-C6alkyl which is substituted by hydroxy, halogen or cyano, phenyl which is unsubstituted or monosubstituted by hydroxy, halogen, SO3H, C1-C4alkyl or C1-C4alkoxy or alternatively, R2and R3, together with the nitrogen atom to which they are connected, complete a saturated 5- or 6-membered ring which may contain, in addition to the nitrogen atom, one nitrogen or oxygen atom and which may be further substituted and n is 0 or 1, a process for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper
REFERENCES:
patent: 2929809 (1960-03-01), Menzi
patent: 5929215 (1999-07-01), Pedrazzi
patent: 7066969 (2006-06-01), Lennartz et al.
patent: 2005042028 (2005-02-01), None
Fogg et al., Analytica Chimica Acta, 362(2-3), 235-240, 1998.
Lennartz Michael
Weiss Sandra
Ciba Specialty Chemicals Corporation
Loggins Shiela A.
Powers Fiona T
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