Preparation of dyed plastics or polymeric dye particles
AssigneeCiba Specialty Chemicals Corporation
InventorsRainer Hildebrand, Peter Sutter
Life of this patent
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Abstract
The present application relates to a process for preparing dyed plastics or polymeric dye particles characterized in that it comprises mixing a high molecular weight organic material with a coloristically effective amount of at least one dye of the formula where R1 is hydrogen, hydroxyl or a radical —NHCO—R6, where R6 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl, R2 is hydrogen, hydroxyl or a radical W—R7, where W is —NHCO— or —S— and R7 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl, R3 is hydrogen, R4 is hydrogen or hydroxyl, R5 is hydrogen, or R3 and R4 combine to form the radical of the formula, where the rings A and B may independently bear further substituents.
Claims4
A process for preparing dyed plastics characterized in that it comprises mixing a high molecular weight organic material with a coloristically effective amount of at least one dye of the formula
- where
- R1 is hydrogen, hydroxyl or a radical —NHCO—R6, where R6 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl,
- R2 is hydrogen, hydroxyl or a radical W—R7, where W is —NHCO— or —S— and R7 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halogen-substituted phenyl,
- R3 is hydrogen,
- R4 is hydrogen or hydroxyl,
- R5 is hydrogen, or
- R3 and R4 combine to form the radical of the formula
- where the ring may bear further substituents, with the proviso, that at least one of the substituents R1 to R4 is not hydrogen.
Dependencies are inferred from the claim text.