Cationic fluorescent whitening agents
AssigneeCiba-Geigy Corporation
InventorHans R. Meyer
Life of this patent
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Abstract
Cationic fluorescent whitening agents of the formula ##STR1## wherein B is a fluorescent whitening agent containing basic tertiary amino groups, m is the number of basic amino groups, and each of R.sub.1, R.sub.2 and R.sub.3 is alkyl of 1 to 4 carbon atoms which is unsubstituted or substituted by non-chromophoric groups, or is alkenyl of 2 to 4 carbon atoms which is unsubstituted or substituted by non-chromophoric groups. These compounds have good solubility in water and they make it possible to prepare concentrated solutions and can be used for whitening organic material.
Claims6
A cationic fluorescent whitening agent of the formula ##STR72## wherein B is a fluorescent whitening agent selected from the group consisting of 2-furanylbenzimidazoles, 2-azolylbenzimidazoles, 2-stilbenylbenzimidazoles and 2,5-(benzimidazolyl)furanes,
- m is the number of basic amino groups, and each of R.sub.1, R.sub.2 and R.sub.3 is alkyl of 1 to 4 carbon atoms which is unsubstituted or substituted by a non-chromophoric group, or is alkenyl of 2 to 4 carbon atoms which is unsubstituted or substituted by a non-chromophoric group.
A process for the production of a cationic fluorescent whitening agent of the formula ##STR73## wherein B is a fluorescent whitening agent selected from the group consisting of 2-furanylbenzimidazoles, 2-azolylbenzimidazoles, 2-stilbenylbenzimidazoles and 2,5-(benzimidazolyl)furanes,
- m is the number of basic amino groups, and each of R.sub.1, R.sub.2 and R.sub.3 is alkyl of 1 to 4 carbon atoms which is unsubstituted or substituted by an non-chromophoric group, or is alkenyl of 2 to 4 carbon atoms which is unsubstituted or substituted by a non-chromophoric group, which process comprises quaternizing a fluorescent whitening agent B with at least a stoichiometric amount m of a phosphate of the formula ##STR74## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above,
- in the temperature range from 60.degree. to 200.degree. C.
A cationic fluorescent whitening agent of claim 21 wherein
- R.sub.6 is methyl,
- R.sub.7 is alkyl of 1 to 4 carbon atoms, benzyl, phenyl or cyanoalkyl of 2 or 3 carbon atoms,
- R.sub.8 is hydrogen, alkylsulfonyl of 1 to 4 carbon atoms, phenylsulfonyl, phenoxysulfonyl, sulfamoyl, alkylsulfamoyl of 1 to 4 carbon atoms, alkoxycarbonyl of 2 to 4 carbon atoms, cyano or chlorine, R.sub.9 is chlorine and R.sub.10 is hydrogen, chlorine or methyl.
Dependencies are inferred from the claim text.