Patent number: 5582621
Abstract: Bulk dyeing of plastics using dyestuffs of the formula (I) ##STR1## wherein n denotes 1 or 2, preferably 1,R.sub.o for n=1, denotes aryl, hetaryl or heterocyclylidenemethyl, or for n=2, denotes a direct bond or arylene andthe ring A is unsubstituted or substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.5 -C.sub.8 -cycloalkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.4 -alkyloxy, C.sub.6 -C.sub.10 -aryloxy, C.sub.6 -C.sub.10 -aryl- or C.sub.1 -C.sub.4 -alkylsulphonyl, cyano, halogen, in particular chlorine or bromine, or a radical of the formula --COR.sub.1, wherein R.sub.1 represents C.sub.1 -C.sub.4 -alkoxy, amino, C.sub.1 -C.sub.4 -alkylamino, di-C.sub.1 -C.sub.4 -alkylamino, C.sub.6 -C.sub.10 -arylamino, C.sub.1 -C.sub.4 -alkyl or C.sub.6 -C.sub.10 -aryl, or contains a fused-on aromatic or cycloaliphatic ring,the plastics used being, in particular, thermoplastics, preferably vinyl polymers, polyesters or polyamides.
Type:
Grant
Filed:
September 13, 1995
Date of Patent:
December 10, 1996
Assignee:
Bayer Aktiengesellschaft
Inventors:
Peter Roschger, Stephan Michaelis, Hauke Furstenwerth