| 摘要 |
The present invention provides a compound having the formula: <IMAGE> (1) <IMAGE> in which M is hydrogen, sodium, potassium, calcium, magnesium, ammonium, mono-, di-, tri- or tetra-C1-C4alkylammonium, mono-, di- or tri-C1-C4hydroxyalkylammonium or ammonium that is di- or tri-substituted by a mixture of C1-C4alkyl and C1-C4hydroxyalkyl groups; R1 is a group having the formula: <IMAGE> in which M has its previous significance and n is 1 or 2; and R2 is O-C1-C12alkyl or N(R3)(R4) in which R3 and R4, independently, are hydrogen, C1-C12alkyl or C1-C4hydroxyalkyl, or R3 and R4, together with the nitrogen atom, are the atoms required to form a pyrrolidine, piperidine or morpholine group. The compounds of formula (1) are particularly useful as fluorescent whitening agents for cotton in discontinuous processes, in the course of which an acidic treatment, especially a finishing treatment using a polymer resin, occurs.
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