Verfahren zur Herstellung von polycyclischen Farbstoffen

摘要

Synthetic linear polyesters, in particular polyethyleneterephthalate, are mass-coloured with polycyclic dyestuffs of the formula wherein R1 represents (C1-C4)-alkyl, hydroxy-(C1-C4)-alkyl, hydroxy-(C1-C4)-alkoxy-(C1-C4)-alkyl or optionally substituted aryl radical, and R2 represents an optionally substituted aryl radical, provided that the dyestuffs contain at least 2 hydroxy-(C1-C4)-alkyl or hydroxy-(C1-C4) - alkoxy - (C1-C4) - alkyl radicals which can either be represented by R1 or which are attached either directly or through bridging atoms or groups to aryl radicals represented by R1 or R2. Examples are given in which polyethylene terephthalate is mass-coloured.ALSO:The invention comprises polycyclic dyes of the formula wherein R1 represents C1-C4 alkyl, hydroxy-(C1-C4) alkyl, hydroxy-(C1-C4) alkoxy (C1-C4) alkyl or optionally substituted aryl; and R2 represents an optionally substituted aryl, provided that the dyes contain at least two hydroxy-(C1-C4) alkyl or hydroxy-(C1-C4) alkoxy-(C1-C4) alkyl radicals which can either be represented by R1 or which are attached either directly or through bridging atoms or groups to aryl radicals represented by R1 or R2. They may be obtained by reacting 2:6-dichloronaphthalene - 1:4:5:8 - tetracarboxylic acid or the corresponding anhydride with an amine of the formula R1NH2 and reacting the resulting imide with an amine of the formula R2-NH2. Specified bridging atoms or groups are -O-, -S-, wherein R3 is H, C1-C4 alkyl or hydroxy (C1-C4) alkyl. Examples are given for the production of the dyes. They are useful for mass-coloration of linear polyesters.