| abstract |
Dyestuffs of the formula ##STR1## wherein Z denotes a radical to complete a 3,4- or 2,3-pyridinylene, a 4,5-pyrimidinylene, a 3,4- or 4,5-pyridazinylene or a 2,3-pyrazinylene system and n X, Y, m and n have the meanings given in the description, n which are particularly suitable for bulk dyeing plastics, in particular thermoplastics, have been found. |