Method for dyeing fibrous materials and dye assistant relating to the same
AssigneeSprings Industries, Inc.
InventorsMelvin A. Caldwell, John R. Holsten
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Abstract
A method for dyeing fibrous material is provided. The method includes contacting a fibrous material with a dyebath comprising a mixture of a dye assistant and a dye soluble or dispersed with the dye assistant in the dyebath. The dye assistant comprises a N-alkyl substituted aromatic sulfonamide. The dye assistant of the present invention can be advantageously utilized for dyeing difficult to dye fibers such as aromatic polyamide fibers, polybenzimidazole fibers and aromatic polyimide fibers.
Claims18
A method for dyeing fibrous material which is particularly adapted for use in reducing the adverse effect of dyeing methods on the flame resistant properties of fibrous material having inherent flame resistant properties, the method comprising contacting a fibrous material selected from the group consisting of aromatic polyamide fibers, polybenzimidazole fibers, aromatic polyimide fibers, fibers of copolymers of the monomers thereof, or blends thereof, with an aqueous dyebath comprising a mixture of a dye assistant and a dye soluble or dispersed with the dye assistant in the dyebath, the dye assistant comprising an N-alkyl substituted aromatic sulfonamide.
Dependencies are inferred from the claim text.