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US 3,941,742 AGranted
Mass coloration of polyamides
AssigneeBadische Anilin- & Soda-Fabrik Aktiengesellschaft
InventorFritz Graser
Life of this patent
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Abstract
A process for the mass coloration of polyamide chips in which a dye of the formula ##SPC1## In which R is hydrogen or chloro is used. The dye is absorbed quantitatively or virtually quantitatively from the aqueous phase. After shaping, pure blue colorations are obtained having great thermal stability.
Claims6
A process for the mass coloration or dope dyeing of a polyamide which comprises:
- coloring or dyeing chips or granules of the polyamide by dry dusting contact or by absorption from an aqueous liquor with a dye of the formula:
- ##SPC6##
- in which R is hydrogen or chloro;
- and
- melting the colored polyamide granules or chips in dry form and processing the melt by extrusion into threads, filaments, wires, sheeting, film or the like.
2 more elements
Dependencies are inferred from the claim text.