| 摘要 |
The invention is concerned with novel cationic dyes having the general formula: Q-(NH-A-CH=CH-B)n wherein the units of formula -NH-A-CH=CH-B are the same or different; n is 2 or 3; A is a benzene ring optionally substituted by a halogen atom, a C1-C4 alkyl or C1-C4 alkoxy group; B is a radical derived from a N-heterocyclic compound having a 5- and/or 6- membered mono- or bicyclic structure with an active methyl or methylene group, and quaternised by a C1-C4 alkyl, hydroxy (C2-C4) alkyl or benzyl group; and Q is the residue of a cross-linking agent selected from the group consisting of phosgene, halogenated triazines and halogenated pyrimidines. The dyes of the invention are particularly useful for dyeing paper.
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