申请人:Kaser Adolf
公开号:US20090083913A1
公开(公告)日:2009-04-02
The invention relates to novel dyes of the formula (1) in which D represents a phenyl or naphthalene residue which is substituted by one or two sulphonic Acid or carboxylic acid groups and, optionally, by one or two groups selected from C
1
-C
4
alkyl, hydroxyl and nitro, each R
1
and R
2
, independently, represent hydrogen or, a C
1
-C
4
alkyl group, R′
1
represents hydrogen, hydroxyl, C
1
-C
4
alkyl or C
1
-C
4
hydroxyalkyl, R
3
represents hydrogen, C
1
-C
4
alkyl or phenyl, which is unsubstituted or substituted by one or two groups selected from C
1
-C
4
alkyl, C
1
-C
4
alkoxy, halogen, hydroxyl, —NH
2
, nitro, —SO
3
M and —CO
2
M and M represents hydrogen, an alkaline or alkaline earth metal, ammonium or ammonium that is mono-, di-, tri- or tetrasubstituted by C
1
-C
4
alkyl or C
2
-C
4
hydroxyalkyl or a polyglycolammonium cation and also known dyes of formula (5), in which D′ represents a phenyl or naphthalene residue which is substituted by one or two sulphonic acid or carboxylic acid groups and, optionally, by one or two groups selected from C
1
-C
4
alkyl and C
1
-C
4
alkoxy and R
3
and M are as defined above, and their mixtures suitable for shading white paper, a process for shading, a process for the preparation of the novel dyes and white paper which has been treated with such shading components.