Method for dyeing aromatic polyamide fibrous materials: N,N-diethyl(meta-toluamide) dye carrier

A method for dyeing fibrous material particularly adapted for use in reducing the adverse affect of dyeing methods on the fame resistant properties of fibrous material having inherent flame resistant properties, the method comprising the steps of:

• contacting aromatic polyamide fibers, polybenzimideazole fibers, aromatic polyimide fibers, fibers of copolymers of the monomers thereof, or blends thereof with an aqueous dyebath comprising a mixture of a carrier and a dye soluble or dispersed within the dyebath, the carrier comprising N,N-diethyl (m-toluamide), an emulsifier and a flame retardant;
• and
• heating the fiber while in contact with the dyebath to fix said dye and flame retardant within the fibers.

In a method for treating fibers with an additive which includes the step of contacting 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 carrier and an additive selected from the group consisting of soluble or dispersed with the carrier, the improvement comprising the use, as the carrier, of N,N-diethyl(m-toluamide).

In a method for dyeing aromatic polyamide fibers, polybenzimidazole fibers, aromatic polyimide fibers, fibers of copolymers of the monomers thereof, or blends thereof in an aqueous dyebath which includes the step of contacting the fibers with a mixture of a carrier and a dye soluble or dispersed in the dyebath, the improvement comprising the use, as the carrier, of an N,N-diethyl (m-toluamide), an emulsifier and a flame retardant.

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 which has been dyed with a dyebath comprising a mixture of a carrier and a dye soluble or dispersed with the carrier ,the carrier comprising N,N-diethyl (m-toluamide).

A fiber of aromatic polyamides, polybenzimidazoles, aromatic polyimides, copolymers of the monomers thereof or blends thereof dyed with an aqueous mixture of a carrier and a dye soluble or dispersed in the dyebath, the carrier comprisins N,N-diethyl (m-toluamide), an emulsifier, and a flame retardant.

A method for dyeing fibrous material comprising the steps of:

• 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 carrie and a cationic dye soluble or dispersed in the dyebath, the carrier comprising N,N-diethyl (m-toluamide) or mixture thereof;
• and
• heating the fiber while in contact with the dyebath to fix said dye within the fibrous material.