Bulk dyeing of plastics

US5582621A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Roschger · Ludwigshafen, DE
• Stephan Michaelis · Leverkusen, DE
• Hauke Furstenwerth · Leverkusen, DE

Key dates

• Filing date: Sep 13, 1995
• Grant date: Dec 10, 1996
• Expiry date: Sep 13, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B23/105
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Bulk dyeing of plastics using dyestuffs of the formula (I) ##STR1## wherein n denotes 1 or 2, preferably 1, PA1 R.sub.o for n=1, denotes aryl, hetaryl or heterocyclylidenemethyl, or for n=2, denotes a direct bond or arylene and PA1 the 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.